Frequently Asked Questions
    Metal Cutting
    in General
  • What is the correct definition: cutting tool or metal cutting tool?
    Historically, metals were the main materials to produce machined parts. Therefore, cutting tools were intended primarily for machining metals, and this determined their name. Today the term "metal cutting tool" is rare enough, while simply "cutting tool" is much more common; and these two definitions have become synonyms.
  • What is "primary motion" and "feed motion"?
    In machining, the primary motion is a rectilinear or rotational motion of a cutting tool or a workpiece that provides the tool advance toward the workpiece to ensure chip removal. In a machining process, the primary motion features the maximum speed and most of the energy, which is required for machining, when compared to all other motions. The primary motion in turning, for example, is the rotation of a workpiece, while in milling, the primary motion is the rotation of a mill.

    The feed motion is a rectilinear or rotational motion of a cutting tool, which adds the primary motion to complete cutting action. This motion features significantly less speed when compared to the speed of a primary motion.
  • What is the difference between macro- and micro geometry of a cutting edge?
    Macro geometry of a cutting edge relates to the key elements of a tool cutting wedge that determine the tool cutting capabilities such as the shape of the rake face, the rake angles, the clearance angles etc. Micro geometry is a microscopic-scale condition of the edge, which is known also as the edge preparation. Depending on the edge condition, the edge can be sharp, rounded (honed), chamfered edge or combined comprising combinations of rounding and chamfering.
  • What is the difference between specific cutting forces that are designated as kc and kc1?
    "kc" relates to actual specific cutting force - the force that is needed to remove a material chip area of 1 mm2 (.0016 in2), which has actual average chip thickness maintained in a machining process.
    "kc1" is commonly used for designating the specific cutting force to remove a material chip area of 1 mm2 (.0016 in2) with 1 mm (.004 in) thickness.
    However, in some technical data sources, the actual specific cutting force may be designated by "kc1", and specific cutting force to remove a material chip area of 1 mm2 (.0016 in2) with 1 mm (.004 in) thickness by "kc1.1". Number "1" that follows index "c" relates to 1 mm2 chip area, and addition "1.1" highlights "1 mm2 chip area with 1 mm thickness".
  • How are cutting tools classified?
    There are distinctive features to classify cutting tools.
    • The machining process, for which a tool is intended (turning tools, milling tools, drilling tools etc.)
    • Primary motion (rotating, non-rotating)
    • The number of a tool cutting edges (single-point tools that have only one cutting edge, and multi-point tools with more than one cutting edge)
    • The tool design concept (solid or one-piece, and assembled)
    • The tool mounting method (bore-type tools, shank-type tools)
    • Adjustment capabilities (adjustable, non-adjustable)
  • Which tool is considered to be standard?
    The definition "standard tool" has a certain duality. On the one hand, it may mean that a tool meets the requirements of a national (international) standard. On the other hand, cutting tool manufacturers use this definition to specify their in-stock products of standard delivery.
  • What is the correct term, "brazed tools" or "soldered tools"?
    Principally, both brazing and soldering relate to the same process: joining various materials together using a molten metal (filler) between these parts, while the filler has a lower melting point than the joined materials. The main difference between brazing and soldering is the process operating temperature, which is less for soldering, and, accordingly, the type of filler. A brazed joint usually features higher strength when compared with a soldered connection. With relation to cutting tools, using the term "brazed" is more correct.
  • What is "oscillation cutting"?
    Oscillation cutting is a machining technique that combines the primary motion with the additional oscillatory motion of a cutting tool relative to a machined workpiece to break chips.
  • What is the concept of high-efficiency machining?
    High-efficiency machining (HEM) is a milling method much like high-speed machining (HSM), which utilizes a large axial depth of cut and a small radial depth of cut in combination with high rotational velocity (spindle speed) of the tool. However, the radial depth of cut varies depending on the angle of tool engagement to facilitate constant chip thickness per cutting edge during tool rotation. This method assures efficient use tool use for the uniform development of wear that covers a large section of the tool's cutting edge. HEM is often referred to as "dynamic milling" and features productive rough milling operations. HEM demands appropriate capabilities of CAM and CNC to generate the required toolpath.
  • What is the reference system of planes?
    The reference system of planes is a rectangular coordinate system with the origin in a selected point of the tool's cutting edge. This system is used to specify the angles that determine the cutting geometry of a tool.
  • How is the reference system for planes selected?
    The reference systems for planes are defined in the following manner: - the tool-in hand system, which specifies a tool cutting geometry for design, manufacturing, and measuring process of the tool. - the tool-in-use system is used to specify the cutting geometry of the tool in use. - the machine system is intended for checking the geometry when the tool is mounted in a machine. The tool-in-hand system relates to the element of a tool that is chosen as a base (datum). The tool-in-use system is aligned with the resultant cutting motion in a machining operation. The machining system uses the direction of primary motion as reference.
  • What are the main mechanisms of tool wear?
    The main mechanisms of tool wear are as follows: - Abrasive wear, is due to the heterogeneous metallurgical structure of the workpiece material, that features particles of different hardness. This causes the tool to be exposed to impact like abrasive machining and the removal of cutting material from the tool. - Mechanical wear is caused due to excessive mechanical load that can lead to a damaged cutting edge. - Adhesive wear occurs at specific values of cutting speeds and temperature in the cutting zone, which results in tool areas being welded with the particles of the removed material. This forms a foreign reinforced material that becomes the cutting edge and changes the cutting geometry. - Oxidation wear happens when the oxygen in the air reacts with the upper layer of the cutting material under high temperature in the cutting zone. - Diffusion wear occurs because of the tool's joint diffusion of material particles, the machined workpiece, and the formed chips. This changes the composition of the cutting material and diminishes its cutting capabilities.
    Fresatura Indexabile Generale
  • What is a cutting edge angle and what is a lead angle?
    There are various international and national standards that specify the active geometry of cutting tools very precisely. The “cutting edge angle” is the angle between the main cutting edge of a milling cutter and the plane containing the direction of feed motion. "Lead angle" (or “approach angle”) is the angle complementary to the cutting edge angle, i.e. the sum of these both angles is 90°. For example, for a typical face milling cutter the cutting angle is the angle between the cutting edge and the plane, which the cutter generates. If this angle is 60°, then the lead angle will be 30°. The cutting edge angle and the lead angle are equal only for 45° milling cutters. The term "lead angle" is more commonly employed in the U.S., while "approach angle" is often used in Europe.
  • What is the difference between "face mill" and "shell mill"?
    These two terms relate to different and complementary features of milling cutters. They are not interchangeable. Milling cutters are classified according to the following main factors:
    • Machine surface type: plane, shoulder, 3D-surface, etc.
    • Cutter mounting method: on mandrel or arbor, in holder, directly in spindle
    • Structure: monolithic; assembled
    • Cutting part material: high speed steel, tungsten carbide, ceramics, etc.)
    "Face mill" characterizes a main field of application - milling flats by the cutting face of a mill. "Shell mill" refers to the design configuration of a mill: the mill has a central bore for mounting on arbor. This configuration is typical for face mills.
  • What is the difference between heavy and heavy-duty milling?
    Sometimes the terms “heavy” and “heavy-duty” are used mistakenly as synonyms. In principle, “heavy milling” (and “heavy machining") relates to milling large-sized and heavy-weight workpieces on powerful machine tools and refers more to the dimensions and mass of a workpiece. “Heavy-duty” specifies a degree of tool loading and mainly characterizes a mode of milling.
  • Which cutting conditions are considered as unfavorable and which are unstable?
    Unfavorable cutting conditions include:
    • workpiece with skin (siliceous or slag, for example)
    • significantly variable machining allowance
    • considerable impact load due to non-uniform machined surface
    • surface with high-abrasive inclusions
    Unstable cutting conditions refer to the low stability of a complete system (machine tool, workpiece holding fixture, cutting tool, workpiece) due to:
    • poor tool and workpiece holding
    • high tool overhang
    • non-rigid machine tools
    • thin-walled workpiece
    The terms "unfavorable" and "unstable" are not interchangeable.
  • How is average chip thickness measured?
    In milling, the thickness of chips is not constant and varies during cutting, depending on several factors. The average chip thickness (hm) is a virtual parameter that characterizes mechanical load on a milling cutter and a machine tool. There are different methods for calculating hm. The most common method is to compute it in relation to the half of an angle of engagement, where the latter is the central angle that corresponds to the arc of a contact between a milling cutter and a workpiece.
  • What is high pressure coolant (HPC) and ultra high pressure coolant (UHPC)?
    There are no strict definitions of high and ultra high pressure coolant (HPC and UHPC correspondingly). Traditionally, machine tools feature coolant supply at pressure 10-15 bar (145-217 psi). This level is now considered as low pressure.
    Various modern machining centers have the option to supply coolant at rates of 70-80 bar (1000-1200 psi), which is considered as high pressure coolant. Ultra high pressure coolant relates to pressure values of 100-200 bar (1450-2900 psi) and even higher.
    Some producers of CNC machine tool equipment manufacture what are known as “medium pressure” pumps; these have values of up to 50 bar (725 psi).
  • What are the benefits of milling with high pressure coolant (HPC)?
    Heat generation is a permanent feature of machining, particularly, milling. If heat generation is intensive, the conventional low pressure coolant forms a vapor layer on the surfaces of a tool and a workpiece. This layer acts as heat sealing, producing an insulating barrier and making heat transfer harder, which significantly shortens tool life.
    Pinpointed high pressure coolant penetrates the barrier and helps to overcome the problem. HPC chills chips quickly, making them hard and brittle. The chips become thinner and smaller, and they break away from the workpiece more easily. High-velocity coolant flow removes the chips. This significantly improves chip evacuation and prevents chip re-cutting.
    HPC improves tool life of a cutting edge due to reducing oxidation and adhesion wear and increasing crack strength. HPC improves chip evacuation because the chips diminish in size, and the high-velocity coolant flow takes them away easily. It allows the design of cutters with smaller chip gullet, leading to a higher number of cutter teeth. Effective cooling reduces the temperature in the cutting zone, ensuring an increased width of cut.
    Overall, HPC provides a good solution for increasing cutting speed and feed rate for boosting productivity.
  • What is the difference between milling with high pressure coolant (HPC) supply through a tool body and turning with HPC?
    In turning, a tool has one cutting edge, while a milling tool features several cutting teeth. The number of coolant outlets in the milling tool is greater. An indexable extended flute cutter, where the teeth are produced by sets of replaceable inserts, will require many more outlets.
    There is a specific relationship between pressure, velocity and flow rate for fluid, e.g. for coolant. In milling, HPC supply through the tool body demands appropriate characteristics of an HPC pump to ensure correct flow volume (flow rate) and not only to meet pressure requirements.
  • Does ISCAR provides indexable cutters for high pressure coolant milling in the standard product line?
    Yes, ISCAR provides these tools in the families of milling cutters for machining titanium and high temperature superalloys (HTSA).
  • Why are nozzles used as coolant outlets in HPC indexable milling cutters?
    There are two reasons for using nozzles as coolant outlets: technological and applicative. HPC supply through the body of a cutter requires small-diameter outlets (as well as demands regarding the shape). As manufacture of the outlets via drilling hard steel tools would encounter technological difficulties, screw-in nozzles represent a more practical option.
    If a depth of cut is smaller than the maximum cutting length of an indexable extended flute milling tool, there is no need to supply coolant to the inserts that are not involved in cutting. To improve performance, you can easy unscrew the appropriate nozzles from their holes, and then close the hole by a plug or a standard set screw.
  • Why are a significant number of HPC milling cutters special (tailor-made)?
    The main consumers of HPC milling cutters are manufacturers working with hard-to-cut materials, for example titanium alloys. In many cases, producing parts from the materials requires a high volume of metal removal. To boost productivity, manufacturers often use unique machine tools, and, to reach maximum operational rigidity, they prefer integral tools with direct adaptation to the spindle of a machine - without intermediate tooling such as arbours or holders. Specific tool diameters, cutting lengths, and overhang, as well as adaptations that vary from one manufacturer to another, demand tailor-made HPC milling cutters.
  • Che famiglie sono presenti nella linea di fresatura indexabile ISCAR?
    La linea di fresatura indexabile è composta da frese progettate per coprire le maggiori applicazioni di fresatura: spallamenti, spianature, fresatura di superfici complesse (profilatura), incavatura e scanaltuara, smussatura ecc. Ci sono inoltre famiglie progettate appositamente per fresature con elevati avanzamenti.
  • I loghi di molte famiglie ISCAR iniziano con "HELI" e frasi come "tagliente elicoidale" e "fresatura elicoidale" sono molto spesso enfatizzate. Perchè?
    All'inizio degli anni '90 ISCAR ha introdotto la famiglia HELIMILL di frese con inserti elicoidali. Il tagliente estremamente efficiente è generato dall'intersezione tra la spoglia superiore e la superficie elicoidale del lato dell'inserto. Il design delle frese HELIMILL genera una spogia positiva costante su tutta la lunghezza di taglio. Questo assicura una sensibile diminuzione della potenza assorbita garantendo un taglio dolce. La famiglia HELIMILL ha introdotto un nuovo approccio, ridefinendo gli standard di fresatura a fissaggio meccanico. Il suffisso "HELI" denomina il tagliente elicoidale.
  • Nella gamma ISCAR sono presenti linee di fresatura per alluminio?
    Sì. ISCAR ha sviluppato una gamma completa di frese indexabili specifiche per lavorazioni efficienti di alluminio. Ogni famiglia è dotata di esclusivo design del corpo fresa e di serraggio degli inserti, strutture con cartucce regolabili, ampia gamma di inserti rettificati e lappati ed inserti con riporto in PCD. La maggior parte delle frese sono dotate di refrigerazione interna. La linea ISCAR HELIALU permette lavorazioni con elevate velocità (HSM), assicurando elevati volumi di truciolo.
  • Il termine "estremamente positivo" viene utilizzato molto spesso per le frese indexabili. Cosa significa?
    Generalmente, fa riferimento agli angoli di spoglia della fresa. Le continue innovazioni nella metallurgia delle polveri permettono di poter produrre inserti con taglienti elicoidali con spoglia frontale molto inclinata rispetto al tagliente. Questo genera un angolo di spoglia molto positivo sulla fresa. La definizione "estremamente positivo" enfatizza questa caratteristica. Nota: la definizione rispecchia l'attuale stato dell'arte. In quest'ottica, l'estremamente positivo di oggi verrà considerato normale in futuro.
  • ISCAR fornisce un'ampia gamma di gradi in metallo duro. Dove si possono trovare informazioni di base sulle proprietà di un determinato grado, velocità di taglio e gamma applicativa?
    ISCAR offre cataloghi elettronici e cartacei, al cui interno sono presenti le guide con le informazioni sulla struttura del grado (tipologia di substrato, rivestimento), la gamma applicativa conforme agli standard ISO e le velocità di taglio.
  • Le frese indexabili sono dotate di refrigerazione interna?
    La maggior parte delle frese indexabili introdotte di recente sono dotate di refrigerazione interna direzionata su ogni tagliente. 
  • Ci sono frese che non hanno la refrigerazione interna. Nel caso in cui fosse necessaria, come si possono modificare le frese?
    Nella maggior parte dei casi la modifica non è necessaria. Infatti ISCAR propone viti di serraggio con ugelli regolabili per fornire una semplice soluzione al problema. Le viti non solo bloccano la fresa sull'attacco, ma assicurano un'efficiente refrigerazione nella zona di taglio. L'ugello, la parte mobile della vite, permette una semplice regolazione in base alle specifiche necessità di lavorazione.
  • In che modo è possibile garantire la corretta forza di serraggio degli inserti?
    Per le frese indexabili, ISCAR fornisce due tipologie di chiavi dinamometriche: con valori regolabili o fissi. Il primo tipo permette il settaggio entro una data gamma, mentre il secondo tipo è pre-settato su un valore fisso. Le forze di serraggio sono disponibili in cataloghi e guide tecniche. Inoltre, questi dati sono marcati anche sul corpo fresa.
  • Cosa è meglio per controllare la produttività: modificare l'avanzamento o la profondità di taglio entro limiti accettabili?
    Ovviamente dipende da molti fattori. Comunque, in generale, a parità di volume di truciolo, aumentare l'avanzamento con minori profondità di taglio è più favorevole rispetto alla combinazione opposta perchè generalmente assicura maggiori durate.
  • Come si possono trovare soluzioni più efficienti per una specifica applicazione?
    Se si conoscono i parametri, ITA (ISCAR Tool Advisor), è uno strumento molto efficiente. Il software è gratuito ed disponibile anche per dispositivi mobili. Nel caso in cui si necessitino di maggiori dettagli e informazioni, contattare direttamente ISCAR per assistenza.
  • What is turn-milling?
    Turn-milling is a process whereby a milling cutter machines a rotating workpiece. This method combines milling and turning techniques and has many advantages.
  • What are the advantages of turn-milling comparing with classical turning?
    • In turning, machining non-continuous surfaces features interrupted cutting that results in unwanted impact load, poor surface finish and early tool wear. In turn-milling, the tool is a milling cutter that is intended exactly for interrupted cuts with cyclic load.
    • When turning materials with long chips, chip disposal is difficult and identifying the correct chipbreaking geometry of a cutting tool is not simple. The milling cutter used in turn-milling generates a short chip that considerably improves swarf handling.
    • In turning eccentric areas of rotating components (crankshafts, camshafts, etc.), off-center masses of the components cause unbalanced forces that adversely affect performance. Turn-milling with its low rotary velocity of a workpiece significantly diminishes and even prevents this negative effect.
    • In turning, the rotation of heavy-weight parts, which defines the cutting speed, is limited by the characteristics of the main drive. If the drive does not allow rotation of large masses with required velocity, then the cutting speed will be far from the optimal range; and will resulut in low turning performance. Turn-milling provides a way to overcome the above difficulties effectively.
  • How I can calculate cutting data for turn-milling?
    The calculation method is shown in the March 2017 issue of “Welcome to ISCAR’s World”, a collection of articles. The electronic version of the issue can be found also on ISCAR’s site catalogs. If necessary, please contact our local representatives in your area – they will be glad to help with this issue.
  • What is the difference between radial chip thinning and axial chip thinning?
    Chip thinning refers to decreasing maximum chip thickness hmax compared to feed per tooth fz.
    Two factors cause this decrease:
    • Cutting geometry of a milling tool, specifically the tool cutting edge angle χr when it is less than 90° ("axial chip thinning"). Good examples of axial chip thinning are fast feed milling and machining 3-D surfaces at shallow depth of cut by ball nose or toroidal-shape milling tools.
    • Influence of width of cut ae. If ae in peripheral milling and face milling is smaller than the radius of the milling tool, hmax becomes lower than fz. This effect is known as “radial chip thinning”. Understanding chip thinning is very important. Maintaining necessary chip thickness requires appropriate increase of feed per tooth and is a key element for correctly programmed fz.
  • What is a slab mill?
    A slab mill is a type of a cylindrical (plain) milling cutter – a milling tool with helical cutting teeth on its cylindrical periphery. Slab mills generally feature large sizes and have a central bore for arbor mounting, mainly in horizontal milling machine tools. Slab mill length is considerably greater than its diameter. These mills are intended for machining an open surface (mostly plane) of a workpiece when the surface width is less than the mill length. Slab mills were very common in the past but today they are used quite rarely.
  • What is “roll-in entering” a machined workpiece in milling?
    Roll-in entering (or, simply, rolling in) is a method of approaching a material in milling. In rolling in, a milling cutter enters the material by arc that causes a gradual growth of mechanical and thermal load on a cutting edge. This approach cut significantly contributes to machining stability and improves tool life. Rolling in is contrary to the traditional straight entering, when the load suddenly increases.
  • What are the advantages and disadvantages of clamping inserts in milling cutters by wedge?
    The main advantages of clamping indexable inserts in a milling cutter by wedge are quick and easy insert replacement or changing a worn cutting edge of the insert (the insert indexing). Clamping by wedge is more common for indexable face mills, especially large-sized. These mills usually work in tough conditions and often become hot. Machine operators prefer the wedge clamping design for such mills.
    However, the wedge, an additional part above the insert in the cutter structure, produces an obstacle for chip flow in the cutter chip gullet, which worsens chip evacuation and reduces cutter performance. This is a major disadvantage of wedge clamping. Intensive contact between the chips and the wedge results in the detrition wear of the latter and shortens its tool life.
  • How to estimate tool life for ceramic cutting tools?
    Ceramic tools behave differently than carbide tools. In most cases, the end of a tool life is determined by the acceptable level of burrs and not by wear size.
  • What is a router?
    In machining, the term "router" has several meanings. It may refer to a rotating tool for hollowing out ("routing") wood and plastic materials. "Router" refers also to a 3-axis CNC machine for cutting soft materials, such as wood, using a rotating tool. In metalworking, a "router" usually means an endmill, intended for milling aluminum at high cutting and feed speeds.
  • Flute or chip gullet?
    In milling cutter terminology, both words designate a chip space or a chip pocket – the shaped area of a milling cutter body that is intended for the flow of chips that are formed as a result of cutting. This space must be sufficient to enable a free, unrestricted chip flow. The term "chip gullet" is generally used to specify the chip space of indexable milling cutters, whereas "flute" is mainly applied to a solid mill design, where it means a helical groove that ensures chip flow and produces a sharp cutting edge or a mill tooth by one of its edges.
  • Chip breaker or chip former?
    A chip breaker is an area of a tool rake face that is specially shaped for breaking or controlling (forming) the produced chip. The term "chip breaker" is commonly used in turning operations, where breaking a long chip is one of the key success factors. In milling, the term "chip former" is generally used, as milling is an interrupted, "chip breaking" cutting process that focuses on chip forming.
  • Which depth of cut percentage is recommended with respect to the insert cutting edge length?
    In process planning, depth of cut is defined depending on operation, machine tool characteristics, rigidity and other factors.
    ISCAR catalogs specify the maximum depth of cut for each insert. Maximum depth of cut refers to the maximal length of the insert cutting edge that can machine.
    This value must not be exceeded. In most cases, inserts are operated at cutting depths of no more than 2/3 of the specified maximum.
  • What is "chip load"?
    The term "chip load" is often used as a synonym for the term "feed per tooth". This term is more common for the North American market. However, the correct synonym for "chip load" is "chip thickness". In shop talk "chip load" relates usually even to maximum chip thickness. In North American countries the term "feed rate" is often used instead of the ISO definition "feed speed". While on this subject, manufacturers can refer to "feed speed" as "table feed".
    However, the correct synonym for "chip load" is "chip thickness". In shop talk "chip load" relates usually even to maximum chip thickness.
    The original term refers to a classical milling machine, from previous generations, where feed motion was created by movements of the machine table.
  • What is the difference between "wiper flat" and "wiper insert"?
    A wiper flat is a small minor edge on a regular indexable insert in milling cutters to improve the quality of a machined surface. It is often referred to as a “wiper.”
    A wiper insert is a specially designed insert were the wiper flat is significantly larger than for a standard insert. When mounted in a milling cutter, the wiper insert protrudes 0.05…0.07 mm axially relative to a regular inserts. A wiper insert "smooths down" the machined surface, noticeably improving surface finish.
  • What is "stepover" and what is "stepdown"?
    In multi-pass milling, "stepover" and "stepdown" refer to the distance between two adjacent passes. "Stepover" relates to this distance when, after finishing a pass, the milling cutter moves sideward and then performs the next pass. By contrast, if at the end of a pass the milling cutter moves downward to start the next part, the distance is called "stepdown". Sometimes "stepover" and "stepdown" are referred to as "sidestep" and "downstep" correspondingly although this is less common.
  • What is the difference between "gang milling" and "straddle milling"?
    Straddle milling is a type of gang milling.
    In gang milling, an assembled tool comprising two or more milling cutters mounted in the same arbor, machines several workpiece surfaces simultaneously. In straddle milling, two or more side-and-face milling cutters, mounted in one arbor, machine parallel planes of a workpiece. The planes are perpendicular to the arbor axis and feature an exact distance (distances) between them. To ensure the necessary accuracy of the distance (distances), the milling cutters are spaced apart with the use of bushings and spacers.
  • What is an "on-edge" insert?
    This term is used sometimes as another name for a tangentially clamped insert. When mounted in a cutter, the insert is placed "edgeways" ("on -edge"), and the largest cross-section of the insert is under the working cutting edge.
  • What is the difference between rough milling and finish milling?
    Rough milling focuses on high metal removal rates while finish milling assures precise accuracy on the milled surface.
    As a rule, finish milling features significantly smaller machining allowances when compared with rough milling.
  • What are the main types of edge conditions for indexable inserts?
    The cutting edge of an indexable insert may be sharp, rounded or chamfered. These are the basic types of edge conditions, also referred to as "edge preparation".
    In addition to the above, there are combined edge conditions such as chamfered and rounded, double-chamfered, and double-chamfered and rounded.
    A rounded edge can also be referred to as a "honed edge".
  • What are the advantages and disadvantages of wedge clamping indexable inserts?
    The wedge clamping principle, which is an alternative to a screw clamping concept, provides a more durable insert structure; there is no need for a central bore. A wedge clamp ensures quick and easy indexing and is very important when the insert is extremely hot due to heavy machining conditions.
    The wedge clamping method is most suitable for machining materials that produce short chips (i.e., cast iron).
  • When should I replace insert clamping screws that secure indexable inserts in the body of a milling cutter?
    An insert clamping screw requires thorough visual examination before using a milling cutter. The threads and head of the screw, as well as the socket for a key, should all be in good operating condition, and therefore, demand special attention. If these screw elements are damaged, or the screw is bent, the screw must be replaced immediately.
    When tightening a screw, apply the correct tightening torque and use the right key to prolong the wear life of the screw. Also, do not forget ISCAR’s recommendations for the application of an anti-seize lubricant when replacing an insert or its indexing. Following these obvious, but sometimes forgotten rules will increase the screw life.
  • How to determine when to replace an insert (change its cutting edge), on a solid tool or on an exchangeable head?
    The correct answers are: At the end of the tool life or upon reaching the wear limit. The life period of a tool or the wear limit for a cutting tool depends on various designs, operational and administrative factors.
    At the same time, during a machining operation, there are certain signs that can indicate the need to replace inserts, tools, or heads. -Noticeable increase of power consumption (spindle load)
    • Increased vibration and noise
    • Worsening of machining accuracy and a need for frequent additional tool dimensional adjusting
    • Reduced surface finish
    • Occurred burrs
    • A visual inspection of a cutting edge shows considerable flank wear, extensive edge chipping, cracks etc.
    For more detailed data on how to define a tool’s life in a specific case, we recommend contacting an ISCAR technical representative.
  • What is the principal difference between a "triangular" and "trigon" indexable insert?
    To be exact, both triangular and trigon relate to the same shape of a polygon – a triangle. A triangular insert features a triangular shape. In a trigon insert, the side of a polygon comprises two-line segments that have the same length and form an obtuse angle.
    From a geometrical point of view, a convex isotoxal hexagon is an accurate definition for the trigon insert shape. Under certain assumptions, this shape may also be referred to as a truncated triangle. However, neither of these names are commonly used, instead, trigon is the most known term today.
    To conclude: the trigon shape of an indexable insert relates to the form of a convex isotoxal hexagon.
  • What is the main design feature of a TANGFIN indexable face mill for superb finish of a machined surface?
    A TANGFIN face mill is based on a step-cutter-concept: the inserts are positioned in gradual locations on the mill in both radial and axial directions. This design causes each insert to cut only a small portion of the material in both radial and axial directions. The high surface quality is attained thanks to a very rigid clamping of the inserts together with the long and straight insert minor cutting edges. A final surface texture is provided by the axially protruding insert that serves as a wiper insert.
    Hence, the combination of the step-cutter robust design and the long wiper cutting edge, which is produced by the axially protruding insert, results in impressive surface finish parameters.
  • All'interno della gamma di prodotti ISCAR, ci sono varie famiglie di frese di ridotte dimensioni che montano inserti piccoli. Qual è il principale campo applicativo, e che vantaggi portano queste frese?
    Queste famiglie hanno una gamma diametri che solitamente viene associata alle frese intergali in metallo duro. Comunque, in fresature con profondità di taglio ridotte, viene utilizzata solo una parte della lunghezza del tagliente, il che rende l'applicazione di una fresa integrale in metallo duro inefficiente, soprattutto in sgrossatura. Al contrario, le frese con inserti piccoli non son progettate solo per questo tipo di applicazioni ma assicurano un utilizzo razionale del metallo duro grazie alla possibilità di sostituzione dell'inserto. Quindi, le frese indexabili di piccole dimensioni forniscono un'alternativa ragionevole ed economica alle frese integrali in metallo duro, soprattutto in sgrossatura.
  • What is the difference between semi-roughing and semi-finishing in milling?
    The difference can be blurred and may often be considered synonyms. However, in some cases when milling a surface requires more than one operation, these operations are specified as rough milling, semi-rough milling, semi finish milling, finish milling, fine milling or simply roughing, semi roughing, semi finishing, finishing.
    Incidentally, the same situation may be observed not only in milling but also in other types of machining, such as turning.
  • What is an integral collet?
    Generally, an integral collet is a tool with a tapered shank for direct mounting in ER collet chucks. When compared to a typical spring collet clamp, the integral collet provides better accuracy and higher rigidity.
  • Do ISCAR's integral collets have internal coolant channels?
    In general, yes, for example, ISCAR's integral collet families with MULTI-MASTER adaptation.
  • What is abreast milling?
    Abreast milling is the method of simultaneous milling of several parts that are positioned in a row parallel to the milling cutter axis.
  • What is the pitch of a milling tool?
    The pitch is the distance between the two nearest-neighboring teeth of a milling tool measured between the same points of the teeth's cutting edges. The pitch shows the tooth density of a tool, in accordance with the milling tools which differ from the tools with a coarse, fine, and extra fine pitch. Parallel to coarse-fine-extra fine pitch rating, alternative grading such as: coarse-regular-fine, normal-close-extra close and others, exists. In addition, extra-fine pitch tools are also referred to as high-density cutters.
  • What is the main application of indexable shell mills with a titanium body?
    Titanium-body indexable shell mills are intended mostly for long-reach machining applications. To improve results and to achieve an excellent surface finish, it is recommended to mount the milling cutter on tool holders with an anti-vibration mechanism, such ISCAR's WHISPER LINE adaptors.
  • Which factors should be considered when determining the feed speed for milling by use of interpolation?
    When determining the feed for milling by interpolation, it is important to consider that the feed speeds (feed rates) of the cutting edge and the mill axis are different. This is unlike straight-line milling. In milling by use of helical and circular interpolation, the programmed feed speed in most CNC machines refers specifically to the axis of the cutter. When milling inside surfaces by interpolation, the feed speed of the mill axis is slower than that of the cutting edge. Conversely, when milling outside surfaces by interpolation, the feed speed of the mill axis is faster than that of the cutting edge. It is necessary to consider the above difference in feed speeds when setting the cutting data.
  • What is the difference between profile milling, milling contoured surfaces and form milling?
    Generally, these definitions mean the same thing and relate to milling 3-D surfaces. Such kind of machining is often named in shop talk as simply profiling.
  • Which industrial sectors are characterized by a great number of profile milling operations?
    First, it is the Die and Mold industry, then Aerospace but almost every branch requires profile milling tools in a varying degree, too.
  • Which types of tools are the most popular for profile milling?
    In rough milling for “pre-shaping” further 3-D surfaces, process planners use different tools and even general-duty 90° milling cutters. Fast Feed milling cutters* are very efficient means for high-efficiency roughing. However, most of profile milling operations relate to toroidal and ball nose milling cutters because they ensure correct generation of a needed shape in every direction.

    * refer to the appropriate section in FAQ session
  • Are inserts with chip splitting action in ISCAR’s profile milling products?
    Yes. Moreover, exactly from MILLSHRED, a family of indexable milling cutters with round inserts, the serrated cutting edge of ISCAR milling inserts was started its way.
  • What is the effective cutting diameter of a profile milling tool?
    In profile milling, due to the shaped, non-straight form of the tool, a cutting diameter is a function of a depth of cut; and it is not the same for different areas of the tool cutting edge that is involved in milling. The effective diameter is the largest true cutting diameter: maximum of the cutting diameters of these areas. In calculating cutting data, it is very important to consider the effective diameter, because the real cutting speed relates to the effective diameter, while the spindle speed refers to the nominal diameter of a tool.
  • Which types of profile milling tools ISCAR provides?
    ISCAR line of profile milling tools comprises Fast Feed*, toroidal, and ball nose cutters in the following design configurations:
    • tools with indexable inserts
    • solid carbide endmills
    • replaceable milling heads with MULTI-MASTER* adaptation

    * refer to the appropriate section in FAQ session
  • What is restmilling?
    Productive milling proposes applying more durable and rigid tools for high metal removal rate. In many cases the form and the dimensions of the tools do not allow for a cut in some area; for example, the corners of a die cavity. The remainder of the material in the areas is removed by restmilling – a method under a technological process where a tool of smaller diameter cuts the areas with residual stock.
  • Does ISCAR recommend the use of “plungers” for profile milling?
    Yes, in cases of large overhang we recommend the use of cutters/plungers on the Z axis, as this will result in a more productive milling operation with less vibration in profiling/roughing. The depth of cut for plungers with overhang is higher than ap for conventional systems, obtaining a higher metal removal rate. ISCAR offers a variety of plungers and, to achieve important lengths, we recommend use of the ITS modular system.
  • What is ISCAR's "rule of 12" for ball nose cutters?
    "The rule of 12" is a rule of thumb that may be useful for quick estimation of the relation between a depth of cut and a width of cut (a stepover) when milling ISO P materials (soft and pre-hardened steel, ferritic and martensitic stainless steel) by ball nose cutters. In accordance with the rule, if a depth of cut is the half of a cutter diameter (D/2), a recommended width of cut (a stepover) should be no more than D/6; for the depth of cut D/3 the maximal width of cut should be D/4 etc.
    It is not difficult to see that 2×6=3×4=12.
  • In face milling, a recommended width of cut is often given as a ratio to a tool diameter. When using a mill with round inserts, which tool diameter should I consider?
    The correct way to decide is by calculating the width of cut with the effective diameter of the mill with round inserts – the largest of the tool diameters that’s involved in cutting.
    This diameter is a function of the depth of cut, or by using the cutting diameter of a face mill for such a calculation. In accordance with standard ISO 6462, the cutting diameter is defined by the point that is produced by the intersection of the major cutting edge and the machined plane. This is the smallest tool diameter involved in cutting, while the cutting diameter is one of the main milling dimensions. This is also specified in the ISCAR catalog.
    Here are some rules for quick estimating the cutting diameter:
    If a face mill carries an even number of round inserts, the cutting diameter may be considered accurate enough as the distance between the centers of two opposite inserts. In other words, it is the mill’s maximum diameter minus the insert diameter.
    If the cutter has an uneven number of inserts, the cutting diameter is approximately equal to the doubled distance from the mill axis to an insert center.
    Using the maximum mill diameter as a base for calculating the width of cut is acceptable only when the depth of cut is close to the insert radius. In any other case, this calculation may cause intensive insert wear.
  • What is a form milling cutter?
    A form milling cutter is a general name for milling cutters that are intended for generating curve-based (complex) surfaces.
  • What is ISCAR's product range for barrel-shaped (circle segment) milling cutters?
    ISCAR's barrel-shaped milling cutter products comprise solid carbide endmills, MULTI-MASTER exchangeable carbide heads, and single-insert indexable endmills. According to the cutting profile, the shape of these cutters can be divided into pure barrel, oval, tapered, lens, and combined.
    Frese a Candela Integrali
  • Does ISCAR provide solid carbide endmills for machining all groups of engineering materials?
    ISCAR’s SOLIDMILL line consists of various families of solid carbide endmills that are intended for machining different materials: steel, stainless steel, cast iron, etc. The line offers a rich variety of tools covering all application groups under ISO classifications P, M, K, N, S and H.
  • Which types of solid carbide endmills does ISCAR offer as standard products?
    ISCAR’s standard solid carbide endmill products include 90° endmills, ball nose cutters, and tools for high feed (fast feed) milling, chamfering, and deburring. ISCAR also offers families of endmills designed specifically for high speed machining that apply trochoidal milling techniques.
  • What are the advantages of the trochoidal milling method?
    Usually, trochoidal milling is applied to machining slots and pockets. In trochoidal milling, a fast-rotating tool moves along an arc and “slices” a thin but wide layer of material. When the layer is removed, the cutter advances deeper into the material radially and then repeats the slicing. This method ensures uniform tool engagement and stable average chip thickness. The tool experiences constant load, causing uniform wear and predictable tool life. The small thickness of sliced material significantly reduces heat impact on the tool and ensures an increase in the number of tool teeth. This method results in a very high metal removal rate with considerably decreased power consumption and improved tool life.
  • What is a "trochoid"?
    "Trochoid", or "trochoidal curve", is a general name for a curve described by a fixed point on a circle as it rolls along a straight line or curves without slipping.
  • What is the secret of CHATTERFREE geometry?
    CHATTERFREE represents a design utilized in several ISCAR solid carbide endmill families. The main CHATTERFREE features are unequal angular pitch of cutter teeth and variable helix angle. This concept results in substantially reducing or even eliminating vibrations during cutting, which significantly improves performance and tool life.
  • What is a variable helix?
    The term "variable helix" refers to the helix angle in vibration-free designs of solid carbide endmills (SCEM), as are found in ISCAR CHATTERFREE products. A typical SCEM features helical teeth and the helix angle determines the cutting edge inclination of a tooth. In traditionally designed endmills, the helix angle is the same for all flutes, but it varies in vibration-free configurations.
    The term “variable helix” is commonly understood to represent two design features: 1) Combining flutes with unequal helix angles where the angles are constant along every flute.
    2) Helix angle varies along the flute.
    However, the term “variable helix” is correct only in relation to design feature 2 and the term “different helix” should be used to specify design feature 1.
  • Why are FINISHRED endmills often referred to as “Two in One”?
    FINISHRED endmills feature four flutes, two serrated teeth and two continuous teeth. This facilitates the integration of two cutting geometries into a single tool: rough (serrated teeth with chip splitting action) and finish (continuous teeth), so gaining the “two in one” appellation. By running at rough machining parameters, semi-finish or even finish surface quality can be achieved. One such tool can replace two rough and finish endmills, reducing cutting time and power consumption while increasing productivity.
  • Does ISCAR provide instructions for regrinding solid carbide endmills?
    Yes. All catalogues, as well as relevant technical leaflets and brochures, contain instructions for regrinding solid carbide endmills, and ISCAR local representatives are available to advise on this issue.
  • What is a length series?
    Solid carbide endmills of the same type and the same diameter often vary in overall length within a family. According to the length gradation, there are short, medium and long series. Additional series such as extra-short or extra-long can also be applied. As a general rule, short-length endmills ensure highest strength and rigidity whereas extra-long solid carbide endmills are intended for long-reach applications.
  • What is a slot drill?
    “Slot drill” is a name of an endmill that can cut straight down. Slot drills have at least one center cutting tooth and are used mainly to form key slots. Slot drills are typically two-flute mills, but they can have three and even four flutes.
  • ISCAR ball nose solid carbide endmills have two or four flutes (teeth). How should the correct number of flutes for a ball nose endmill be chosen?
    The all-purpose four flute ball nose solid carbide endmills provide a universal and robust production solution for various applications, especially for semi-finish and finish operations. Two flute endmills have a larger chip gullet, which makes them more suitable for rough machining as they ensure better chip evacuation. Two flute tools are also considered to be a workable method for fine finishing due to a lower accumulated error, which depends on the number of teeth. When milling with shallow depth of cut, calculating feed per tooth should take into consideration only 2 effective teeth; as the advantages of a multi-flute design are diminished.
  • Does the ISCAR solid carbide endmill line include miniature endmills?
    ISCAR solid carbide endmill lines include endmills with diameters of tenths of mm. For example, the standard ball nose endmills, which are intended for processing ribs for hard materials, start from a minimal diameter of 0.1 mm.
  • Does ISCAR produce solid ceramic endmills? Where is their application most effective?
    ISCAR's product range includes a family of solid ceramic endmills. They are mainly applied to machining high temperature superalloys, heat resistant stainless steel, cast iron and graphite.
  • What are the applications for ISCAR's lens- and oval-shape solid carbide endmills and MULTI-MASTER exchangeable heads? (Related to MULTI-MASTER - 466)
    The lens- and oval-shape solid carbide endmills and MULTI-MASTER exchangeable heads are designed for 5-axis semi-finish and finish milling complex surfaces, especially in aerospace, medical and die & mold industries.
  • Is it possible to regrind ISCAR's lens- and oval-shape solid carbide endmills?
    The lens- and oval-shape solid carbide endmills features a complicated cutting shape and therefore they are not intended for regrinding.
  • Come è montata la testina sullo stelo?
    La testina ha due superfici: un cono corto una superficie posteriore non tagliente che determina il posizionamento sullo stelo. Il cono assicura elevata concentricità e la superficie posteriore il contatto frontale. Quindi la parte posteriore della testina è composta da due parti fondamentali: conica e filettata. Per il montaggio, la testine viene inizialmente posizionata a mano e serrata con la chiave.
  • Quali sono i vantaggi del contatto frontale?
    Prima di tutto, il contatto frontale incrementa rigidità e stabilità dell'assemblaggio per resistere ai carichi molto comuni in fresatura. Questo assicura un taglio stabile, minimizza le vibrazioni e riduce la potenza assorbita. Inoltre il contatto frontale assicura elevata ripetibilità della sporgenza della testina rispetto allo stelo. Per questo, non sono necessari tempi di setup dopo la sostituzione della testina, che può essere montata con lo stelo in macchina.
  • A cosa si riferisce il "gap iniziale"?
    La prima fase del serraggio viene effettuata a mano. Quando la testina si ferma, rimane un piccolo spazio (gap) tra i piani dello stelo e della testina. Da questo momento è possibile serrare la testina solo utilizzando la chiave. Il serraggio della testina causa una deformazione elastica nell'area di contatto dello stelo in direzione radiale. I gap di cui sopra viene definito "iniziale" ed è un fattore molto importante del sistema MULTI-MASTER. Il valore è nell'ordine di decimi di millimetro, in base alla dimensione del filetto.
  • Perché il filetto MULTI-MASTER ha un profilo speciale?
    Le testine MULTI-MASTER sono realizzate in carburo di tungsteno. Nonostante sia un materiale estremamente duro e resistente al calore, ha minori forze d'impatto rispetto, per esempio, all'acciaio super-rapido(HSS). Quindi, progettando un particolare filettato in carburo di tungsteno, minimizzare gli stress è uno dei principali problemi da risolvere.
    Inoltre, la connessione filettata MULTI-MASTER ha dimensioni relativamente ridotte: i diametri nominali dei filetti variano entro 4-15 mm. Queste misure e la necessità di sopportare i carichi di lavoro, possono limitare l'altezza del profilo del filetto. Quanto descritto rendono problematico l'utilizzo di filetti standard e richiedono quindi un design specifico del filetto che soddisfi le specifiche di connessione. Questi sono i motivi che hanno spinto ISCAR a progettare un filetto specifico per la linea MULTI-MASTER.
  • Quali tipologie di testine MULTI-MASTER offre ISCAR?
    • Testine con varie forme - 90°, 45°, 60° ecc
    • Testine per profilatura ball nose, toroidali, con raggi concavi ecc
    • Testine per incavatura e scanalatura per anelli di tenuta, OR, cave a T ecc
    • Testine per filettatura
    • Testina per centrinatura
    • Testine per incisioni
    Le testine hanno un numero differente di denti (eliche), angoli d'elica e gradi di precisione, così come geometrie di taglio per lavorazioni efficienti di un'ampia gamma di materiali
  • What is an economy-type end milling head?
    There are two types of MULTI-MASTER end milling heads.
    The first type of MULTI-MASTER end milling head is the same as the ISCAR standard solid carbide endmills but differs in overall and cutting edge lengths. A major advantage of this type of end milling heads is that there is a large variety to choose from (practically all the standard line of the solid mills). In finishing and milling hard materials, increasing the number of flutes makes cutting more stable and productive. The heads of the first type are produced from stepped cylindrical blanks by grinding.
    The second type of MULTI-MASTER end milling heads is the economy version; it is shaped beforehand by pressing and sintering with a small oversize. Further grinding defines the final shape of a head and its accuracy. The heads of this type have a high-strength tooth that makes it possible to substantially increase the feed per tooth in comparison with the heads of the first type. Pressing technology enables production of different complicated shapes; although making these from the stepped blanks is problematic. The economy-type heads have only two teeth.
  • Why do the MULTI-MASTER keys have two openings?
    Due to the design features of the heads, one of the openings, similar to openings of ordinary engineering wrenches, is intended for the multi-flute heads of the first type of MULTI-MASTER end milling head (see above) and the appropriate cylindrical blanks. The second shaped opening is designed for the economy-type heads.
  • La famiglia MULTI-MASTER ha anche soluzioni per foratura?
    Sì. La famiglia MULTI-MASTER offre testine a 60°, 80°, 90°, 100°, 120° e 145 progettate non solo per smussi, ma anche per fori pilota e lamature. Inoltre, sono disponibili testine per centrinatura.
  • Is a center drilling head that is made from solid carbide, really a reasonable solution? There are various low-cost double-sided standard combined center drills and countersinks produced from HSS.
    When compared to the above-mentioned HSS combined drills and countersinks, the center drilling heads allow for a considerable increase in tool life. The heads are operated under higher cutting data and thus lead to higher productivity. Therefore, we advise checking the current production cost and then making a decision, taking all relevant factors into account.
  • What is the accuracy of the heads?
    The nominal diameter of the normal accuracy end milling heads has the following tolerance limits: e8 for multi-flute heads produced from blanks and h9 for the economy- type heads. The precise heads for finish profiling are made with tolerance limits for diameter h7 and the heads for milling aluminum – h6. The diametric tolerance for the cylindrical cutting area of the heads for chamfering, spot drilling and countersinking is h10.
  • What is the repeatability tolerance of MULTI-MASTER heads?
    As mentioned in the answer to question 2, one of the main advantages of the face contact is high repeatability, which ensures closed tolerance for the head overhang with respect to the contact face of a shank. The overhang limits are ±0.01 mm for the majority of the end milling heads. 
  • Does ISCAR offer MULTI-MASTER heads intended for milling hardened steel? 
    Yes. These heads are made from a high-strength and wear-resistant submicron carbide grade; and they have tight dimensional tolerances.
  • What are the main types of shanks and for which purpose should they be used?
    The shanks are available in different versions: smooth cylindrical and with a neck. The neck can be straight or conical.
    The smooth shanks and the shanks with a straight neck, called Type A shanks in MULTI-MASTER’s designation system, are general purpose shanks and are used for a variety of applications. There is also a reinforced version, intended mainly for milling keyways or high-feed milling (HFM). It is distinguished by flats on a shank body that make it suitable for clamping in Weldon-type adapters.
    Type B is a reinforced shank with a relatively short conical neck which has a taper angle of 5° on the side. It is characterized by increased strength of the durable body that defines its main application: heavy-duty machining.
    For long-reach machining at high overhang, the Type D shank with a long conical neck can offer a good solution. It has a taper angle of 1° on the side and is designed primarily for milling deep pockets and cavities, high steep walls, etc. This shank should not be used in heavy-load conditions.
    For short-reach applications, the MULTI-MASTER family offers shanks with a collet adaptation. These are mounted directly into a collet chuck instead of the spring collet. The direct mounting increases rigidity and accuracy, and reduces the overall overhang relative to the datum face of a machine tool spindle.
    The MULTI-MASTER family also includes smooth steel cylindrical shanks of considerable overall length (at least 10 diameters of the shank). These are intended primarily for producing specially tailored tools of various configurations by additional machining of the shanks in order to form the required shape. Such machining can be performed even directly by the customer. In fact, they are the blanks with an internal T-thread. For the convenience of additional machining operations (turning, sometimes external grinding, etc.), the shanks are provided with a center hole in the rear face.
    The MULTI-MASTER family contains a variety of extensions and reducers for connecting with other ISCAR systems of modular tooling (for example, FLEXFIT)
  • From what materials are the shanks made? How should the correct material be chosen?
    The shanks are produced from the following materials: steel, tungsten carbide and heavy metal (an alloy containing 90% and more of tungsten).
    In the context of functionality, a steel shank is the most versatile. Due to the considerable stiffness of tungsten carbide, a carbide shank is intended primarily for finishing and semi-finishing, machining at high overhang and milling internal circumferential grooves. In case of unstable cutting, applying a heavy metal shank can give good results because of the vibration-proof properties of heavy metal. However, heavy metal shanks are not recommended for heavy-duty machining.
  • Are the MULTI-MASTER tools suitable for coolant supply directly through the tool body?
    Yes, there is a design of the shanks with holes for internal coolant supply.
  • Can the MULTI-MASTER shanks be held in heat shrink chucks and collets?
    The carbide or heavy metal shanks are suitable for toolholding by the heat shrink method. As for the steel shanks, clamping them into heat shrink chucks and collets is not recommended.
  • Is it necessary to lubricate T-threads when mounting the heads into a shank?
    No. Do not apply lubricants to the MULTI-MASTER T-thread connection!
  • Are the MULTI-MASTER connection design and thread compatible with other tool brands?
    No. ISCAR’s unique design is patented and other systems that appeared later are not compatible.
  • Does ISCAR provide blank MULTI-MASTER heads that are intended for final forming by the customer?
    The MULTI-MASTER family includes semi-finished uncoated carbide blank heads, designed for manufacturing various special cutting profiles by additional grinding at customer facilities. The blank heads have a T-thread for MULTI-MASTER adaptation and a cylindrical portion intended for grinding by the customer.
  • Does ISCAR provide a key with adjustable tightening torque for MULTI-MASTER heads?
    Yes. The MULTI-MASTER product range includes an assembled key, comprising an adjustable torque handle with a set of interchangeable wrenches and TORX-tipped bits, designed for secure and accurate tightening of MULTI-MASTER heads. This key is an optional product and should be ordered separately.
  • What are the applications for ISCAR's lens- and oval-shape solid carbide endmills and MULTI-MASTER exchangeable heads?
    The lens- and oval-shape solid carbide endmills and MULTI-MASTER exchangeable heads are designed for 5-axis semi-finish and finish milling complex surfaces, especially in aerospace, medical and die & mold industries.
  • What is the maximum rotational velocity for a MULTI-MASTER milling tool?
    A MULTI-MASTER tool is an assembly comprising of a shank and an exchangeable milling head. The maximum rotational velocity values (in rpm) for each shank can be found in ISCAR’s catalogs and guides. To estimate the maximum rotational velocity for an assembly when a specific milling head is attached to a shank, the maximum rpm value (taken from the catalog) should be divided by the number of flutes of the milling head.
    Apart from keeping the maximum rotational velocity restriction, the entire tool assembly (milling head, shank, and adapter/tool holder) must be properly balanced.
  • Which of the MULTI-MASTER milling heads are considered long-flute?
    Usually, these are the heads where the length of a cutting edge is at least half as much as the head diameter.
  • C'è un'ampia gamma di testine Multi-Master MM HCD per smussi, retrolamature e centrini con angoli al vertice differenti. Qual è il motivo di questa varietà?
    Nella linea di prodotti standard Multi-Master, le testine MM HCD hanno angoli al vertice di 60°, 80°, 90°, 100° e 120°. Questa varietà è data principalmente dalle richieste di standard differenti per smussi e retrolamature per elementi di fissaggio. Per esempio, le viti a testa svasata richiede smussi a 90°, ma le viti American National richiedono 80° ed i rivetti aerospace 100°. Uno smusso tipico è a 45°, ma gli smussi a 30° e 60° sono molto comuni. Questa varietà di profili generati richiesti spiega l'ampia gamma di testine.
  • What is the main field of application for the ISCAR MULTI-MASTER exchangeable flat bottom drilling head?
    The application range of these heads is not limited to making relatively short holes with a flat bottom (in-depth of up to 1.2 of the hole diameter). The MULTI-MASTER exchangeable flat bottom drilling head ensures efficient drilling on slanted and curved surfaces, directly on solid material without center- or pre-drilling, making it possible to produce half holes, counterboring and spot facing.
  • Is it necessary to reduce the feed rate when drilling slanted surfaces with the MULTI-MASTER exchangeable flat bottom drilling head?
    Yes. When drilling slanted surfaces, the feed rate should be adjusted according to the angle of a surface inclination as recommended in the corresponding ISCAR guides. It can be roughly estimated that the feed reduction is 30-50% of a common value, depending on the angle of inclination.
  • Does ISCAR produce MULTI-MASTER tools for direct mounting onto a machine spindle?
    Yes, ISCAR produces MULTI-MASTER tools with tapered shanks for mounting in spindles with various adaptations. For example: 7:24 taper (DIN 69871), HSK taper (DIN 69893), polygonal taper (ISO 26623-1) etc.
    Elevati Avanzamenti
  • Che tipologie di frese per elevati avanzamenti produce ISCAR?
    La linea di frese per elevati avanzamenti ISCAR comprende frese indexabili, Multi-Master e frese integrali in metallo duro.
  • Quale operazioni di fresatura è la più indicata per lavorazioni con elevati avanzamenti?
    Le operazioni più indicate per lavorazioni con elevati avanzamenti sono la sgrossatura in spianatura, creazione di tasche e cavità.
  • Qual è il significato di "FFF" che si trova spesso nelle presentazioni tecniche ISCAR?
    "FFF" fa riferimento alla spianatura con elevati avanzamenti.
  • di acciai e ghise. Questa tecnica può essere utilizzata anche per materiali difficoltosi come titanio o superleghe?
    Le frese per elevati avanzamenti possono essere utilizzate anche per materiali difficoltosi.
    La geometria di taglio in questi casi è differente rispetto alle geometria progettata per acciai e ghise. Inoltre, l'avanzamento al dente sarà inferiore rispetto alle lavorazioni di acciai e ghise; in qualsiasi caso sarà decisamente superiore rispetto ai parametri consigliati per il metodo tradizionale
  • Cosa sono le frese MF?
    MF sta per "Avanzamenti Moderati": moderati rispetto ad "Elevati", ma sicuramente maggiori rispetto alla fresatura tradizionale. Il metodo MF è pensato per maggior produttività su macchine con poca potenza, fresatura di pezzi pesanti ecc
  • The LOGIQ campaign introduced new families of indexable FF milling cutters with a diameter range typically covered by solid carbide endmills. Can these new cutters successfully compete with the solid carbide design concept?
    Yes. The design of the cutters ensures a multi-teeth tool configuration. Let’s consider the NAN3FEED mill family as an example. They have 2 and 3 teeth for nominal diameters 8 and 10 mm (.315 and .394”) correspondingly. In a cutter carrying replaceable inserts, only the insert - a small part of the cutter - is made from cemented carbide. This means that the indexable design consumes far less of this expensive material than a solid carbide solution. The NAN3FEED insert with its 3 cutting edges ensures triple edge indexing, which is also cost-effectiveness. As the insert is small, it is placed simply in a pocket via a key with a magnetic boss on the key handle. The economical efficiency and ease of use make the family competitive with solid carbide tools.
  • Are fast feed cutters recommended for milling operations in turning or multi-task machines?
    Yes. In general, these are small to medium diameter cutters and the turning operation is fast. The use of fast feed cutters results in improving the milling operation, reducing the machining time and minimizing damages to the machine head. MULTI-MASTER is an excellent option for turn-milling machines.
  • What is a radius for programming in fast feed milling cutters?
    In CNC programming, a fast feed cutter is often specified as a 90°mill with a corner radius. This imaginary radius, which is called as "radius for programming", is an important data because it defines the maximal thickness of a cusp (scallop) and deviations from the theoretical profile of a surface that is generated by such a specification.
  • ISCAR ha un'ampia gamma di frese per elevati avanzamenti. Come scegliere la soluzione ottimale per la mia lavorazione?
    Le informazioni di base delle frese ISCAR per elevati avanzamenti ed i consigli per la scelta si possono trovare sulla guida per Fresatura con Elevati Avanzamenti; disponibile sia in formato elettronico(sito ISCAR) sia in formato cartaceo. Se la questione si riferisce ad una specifica applicazione con dettagli noti, una soluzione può essere trovata tramite il software online ITA (Iscar Tool Advisor).
    High Speed Machining (HSM)
  • What does the term "high speed machining" mean?
    Often HSM is emphasized as "a high-efficiency method of modern machining with high spindle and feed speed". High speed machining may refer to:
    • High cutting speed machining
    • High spindle speed machining
    • High feed speed machining
    These three speeds are interrelated. Increasing spindle speed automatically results in increasing feed speed as well, and likewise higher cutting speed requires a correspondingly higher spindle speed. As cutting speed varies in direct proportion to the diameter of a rotating tool, for tools of different diameters, different spindle speeds are required to ensure that the cutting speed is identical. A cutting speed is also a function of several factors, where a workpiece material and a cutting tool material are dominant. Depending on the cutting tool material, the recommended cutting speed for the same workpiece material may be quite different. A good example of this is machining nickel-base high temperature alloys by cemented carbide and whisker ceramic tools. At the same time, in machining aluminum, for instance, "normal" cutting speeds are significantly higher than in machining the high-temperature alloys.
    The term "high speed machining" usually relates to high speed milling, which is a milling method that is characterized by shallow, light cuts combined with high spindle speed.
  • Is the cutting speed extremely high in high speed machining?
    Not always. Let's examine one example. Assume that we machine a material with the use of a ball nose milling cutter of 4 mm in diameter while the depth of cut is 0.1 mm. The effective diameter in this case will be 1.25 mm. If the cutting speed as 60 m/min is required, the cutter should rotate at 15280 rpm. If the cutting speed will be 100 m/min, the rotational speed of the cutter will increase up to 25465 rpm! High speed machining does not automatically mean that the cutting speed is high.
  • Is it correct that a machine tool intended for high speed machining must have a high speed main drive?
    Yes, but not only. As rotational speeds and feed speeds are interrelated, the machine tool should also feature a high speed feed drive. Furthermore, the machine tool must have appropriate fast control systems, high rigidity and many other design features, to make it suitable for high speed machining.
  • Can high speed machining be applied to machining hard steel?
    Yes. In machining hard steel – which are difficult-to-cut materials – intensive heat generation and vibration take place. This is a source of poor tool life, reduction of accuracy, loss of stability etc. that makes machining operations unpredictable. High speed machining with its shallow cuts produces much lower cutting forces and heat, and therefore can solve these issues.
  • Why is high speed machining becoming more and more popular in rough machining operations?
    Technological advances, especially in producing workpieces that are half-finished products, place special emphasis on high speed machining. Methods such as precise casting, metal injection molding, and 3D printing ensure that the production of workpieces is very close to the final shape of a part. As a result, the need to remove a high volume of materials by means of traditional rough cutting decreases. As high speed machining features low stock removal, it offers a precise method of producing workpieces.
  • How does trochoidal milling relate to high speed machining?
    In trochoidal milling, a fast-rotating tool moves along an arc and “slices” a thin but wide layer of material. This milling method features small widths (or radial depths) of cut and high speed rotation of the tool and may be considered as a high speed machining technique.
  • Does ISCAR provide information about maximum rotational velocities for milling cutters?
    Yes. This information can be found in catalogues, guides, leaflets and other technical documentations. In many cases, the maximum rotational velocity permitted for indexable milling cutters is marked directly on a cutter body.
  • Utensile mandrino per elevate velocità di lavorazione devono essere bilanciati?
    Sì. In fresatura con elevate velocità, le caratteristiche dinamiche di una fresa non possono essere separate dal mandrino, quindi occorre fare molta attenzione all'assemblato.
  • Cos'è Peel Milling?
    Solitamente con peel milling viene definito il metodo di fresatura che si basa sulla combinazione di elevate profondità di taglio e impegni radiali molto limitati della fresa. La fresatura trocoidale può essere considerata una parte del processo di peel milling, e spesso vengono utilizzati come sinonimi.
    Incavatura e Scanalatura
  • Quali frese vengono utilizzate per lavorazioni incavatura?
    In generale si possono utilizzare molte tipologie di frese per incavature e scanalatura. Comunque sole le frese con taglienti frontali e periferici sono progettate appositamente per incavatura e scanalatura. ISCAR propone una linea di frese dedicata per incavatura e scanalatura.
  • Qual è la differenza tra incavatura e scanalatura?
    Molto spesso sono sinonimi. Incavatura fa riferimento ad un'apertura stretta, relativamente lunga, principalmente longitudinale; scanalatura fa riferimento ad un canale circolare (chiamato "sottosquadro") o elicoidale.
  • Slot milling tools are often referenced as slotting tools. Is this correct?
    The word “slotting”, commonly known as “slot milling”, is widespread in shop talk but the two actions are not identical or interchangeable. Slotting refers specifically to a stage in planning or shaping – a machining process where a single-point cutting tool moves linearly and piston wise, and a workpiece is fixed or moves only linearly concurrent with the tool.
  • Perchè le frese per incavatura vengono definite anche frese frontali e laterali?
    Le frese per incavatura hanno taglienti frontali e laterali per la lavorazione simultanea del fondo e delle pareti della cava.
  • Quali sono le principali tipologie di frese per incavatura?
    Queste frese hanno diverse tipologie di attacco. Possono essere con o senza flangia o, in alternativa, possono essere testine intercambiabili per frese modulari.
  • Qual è il programma ISCAR per incavatura?
    ISCAR ha sviluppato frese per incavatura in varie tipoogie:
    - Frese indexabili
    - Frese assemblate MULTI-MASTER con teste intercambiabili
    - Frese assemblabili T-SLOT con testine intercambiabili in metallo duro
  • Quali cave vengono definite strette?
    Una regola empirica definisce "stretta" una cava con spessore massimo di 5 mm e profondità di almeno 2.5 volte lo spessore.
  • What type of milling does ISCAR recommend for these types of cutters?
    Down milling is normally recommended, where chip thickness is formed from thick to thin.
  • What is the difference between indexable slotting cutters and slitting cutters?
    Originally, slotting cutters were intended for milling slots and grooves while slitting cutters were used for slitting or cutting-off. Each type of cutters featured different accuracy requirements, and slitting cutters were less precise. However, technological progress has significantly leveled out differences between slotting and slitting cutters in indexable milling.
  • Why are the terms "axial depth of cut" and "radial depth of cut" very common in milling slots and grooves?
    In milling, a depth of cut is usually measured along the axis of a cutter, axially, while a width of cut – radially, in the direction perpendicular to the axis. Hence the depth of cut and the width of cut also can refer to as "axial depth of cut" and "radial depth of cut" accordingly.
    However, this generally accepted approach may sometimes lead to confusion in the case of disc slot milling cutters. The axial depth of cut here is equal to the width of cutter teeth, and it defines the width of a milled slot. The radial depth of cut in the such a case reflects the slot depth.
    Therefore, in machining disc milling cutters, using the terms "axial depth of cut" and "radial depth of cut" helps in preventing possible misunderstandings.
  • Una testina ISCAR SD-SP per incavatura può essere montata su uno stelo MULTI-MASTER?
    No, le testine intercambiabili SD-SP non sono disponibili per il montaggio diretto su stelo MULTI-MASTER. Comunque, il montaggio è possibile con l'utilizzo di adattatori SD CAB.
    Frese ad Elica Estesa
  • Perchè frese "ad elica estesa"??
    La parte tagliente di una fresa ad elica estesa è composta da una composizione di inserti posizionati gradualmente. Rispetto ad una fresa "normale" la cui lunghezza di taglio è limitata dal tagliente dell'inserto, la lunghezza di taglio delle frese ad elica estesa è decisamente maggiore - è estesa dalla composizione di inserti.
  • Quali sono gli altri termini tecnici per le frese ad elica estesa?
    Le frese ad elica estesa vengono definite anche frese a tagliente lungo e frese a riccio.
  • Quali sono le principali applicazioni delle frese ad elica estesa?
    Le frese ad elica estesa sono progettate per sgrossature con elevate performance: spallamenti elevati, cavità profonde ecc
  • Le frese ad elica estesa possono essere utilizzate in operazioni di semi-finitura?
    Sì. Ci sono soluzioni che assicurano questo tipo di lavorazione. Per esempio, le frese ISCAR HELITANG FIN LNK montano inserti tangenziali rettificati sul perimetro progettati appositamente per semi-finitura.
  • Perchè per molti tipi di frese ad elica estesa sono disponibili inserti chip splitting?
    Le frese ad elica estesa lavorano con carichi molto elevati. La geometria chip splitting è molto spesso integrata per migliorare sensibilmente le performance di lavorazione.
    • La geometria chip splitting assicura un truciolo molto piccolo, di semplice evacuazione che ne assicura un'ottima gestione.
    • Inoltre la geometria chip splitting assicura una decisa diminuzione delle vibrazioni generate.
    • In molti casi riduce anche le forze di taglio e la potenza assorbita, portando a minor calore generato.
    • Il truciolo di piccole dimensioni inoltre tende a non essere rilavorato, assicurando lavorazioni più produttive e maggiori durate.
  • Quali sono le configurazioni delle frese ad elica estesa ISCAR?
    La linea standard ISCAR di frese ad elica estesa comprende varie configurazioni:
    • Frese a manicotto
    • Frese con stelo cilindrico (liscio o con piani, conosciuto come Tipo Weldon)
    • Frese con attacco conico (7:24, HSK)
    • Attacco poligonale conico con teste intercambiabili con connessione FLEXFIT
  • Le frese ad elica estesa ISCAR sono dotate di refrigerazione interna?
    La maggior parte delle frese ad elica estesa ISCAR sono dotate di refrigerazione interna.
  • ISCAR consiglia di utilizzare frese ad elica estesa per lavorazioni di titanio?
    Sì. Le lavorazioni di titanio solitamente sono caratterizzate da elevati volumi di truciolo. Le frese ad elica estesa assicurano elevati volumi con ottime performance, portando una sensibile riduzione dei tempi ciclo.
  • Why are some extended flute cutters defined as ‘fully effective’?
    The design of the cutters known as ‘fully effective’ features the inserts interlinked and overlapping, resulting in a continuous flute. Many other cutters are “half effective”, where the inserts are placed alternately and 2 flutes are necessary to cover the area that the fully effective cutters can cover with only one flute.
    Fresatura di Ingranaggi
  • Does ISCAR provide tools for milling gears and splines?
    ISCAR’s current tool program, for milling spur gears with straight teeth and splines, has been developed to include three types of cutter:
    • cutters with indexable inserts
    • cutters with replaceable cutting heads based on the T-SLOT concept
    • cutters with replaceable MULTI-MASTER cutting heads
  • For which method of generating teeth are ISCAR’s milling tools intended?
    Form milling and power skiving.
  • When talking about generating a tooth profile, what is meant by “form milling”?
    Form milling is one of the methods for generating tooth profiles. In form milling, a milling cutter with a working shape like the contour of a tooth space, machines every tooth individually; and a workpiece is indexed through a pitch after generating one space.
  • Are there other methods of generating tooth profiles, apart from form milling?
    The principal methods (in addition to form milling) include gear hobbing, which uses a hob, a cutter with a set of teeth along a helix that mills the workpiece and that rotates together with the workpiece in a similar way to a worm-wheel drive; gear shaping with the use of a gear-shaping cutter, a rotating tool that visually resembles a mill; and by power skiving - a technique that combines gear milling and gear shaping. There are also other methods of generating teeth profiles, such as gear broaching, gear grinding, and gear rolling.
  • Is milling gear teeth the final operation of a gear-making process?
    In general, milling gear teeth is not the final operation in the gear-making process. After this operation, it is necessary to remove burrs and then the sharp edges of the teeth should be rounded or chamfered, for better engagement. Gear rounding, and gear chamfering operations are necessary to avoid quenching gears with sharp edges, which may cause various micro cracks that affect gear life. In addition, milling teeth ensures parameters that feature only gears of relatively low accuracy. As manufacturing precise gears demands tougher characteristics of accuracy and surface finish, other processes such as gear shaving, gear grinding, gear honing, etc., are also applied.
  • Usually, form gear milling relates mainly to individual and low-batch production. Why do manufacturers of general-purpose cutting tools, including ISCAR, include form gear milling cutters in their program for standard lines?
    With batch manufacturing, milling gear teeth is made on specific gear hobbing machines as gear hobbing productivity is substantially higher. However, advanced multifunctional machine tools increasingly widen the range of machining operations that can be performed. Technological processes developed for these machines are oriented to maximize machining operation for one-setup manufacturing, creating a new source for more accurate and productive manufacturing. Milling gears and splines is one of the operations suitable for performing on the new machines.
    These new machines require appropriate tooling and manufacturers of general-purpose cutting tools are reconsidering the role of gear-milling cutters in their programs for standard product lines.
  • What is the module in gearing?
    The module (modulus) is one of the main basic parameters of a gear in metric system. It is measured in mm. The module m of a gear with pitch diameter d and number of teeth z is the ratio of the pitch diameter to the number of teeth (d/z).
  • Does the inch (Imperial) system of gearing also use the module as a basic parameter in gearing?
    The inch (Imperial) system operates another basic parameter: the diametral pitch. This is the number of gear teeth per one inch of the pitch diameter. If a gear has N teeth and it features pitch diameter D (in inches), diametral pitch P is calculated as N/D. Sometimes, when specifying gears in inch units, the so-called English module is used. In principle, this module has the same meaning as the module in the metric system, e.g. the ratio of the pitch diameter and the number of teeth; however, the pitch diameter should be taken in inches and not in millimeters like in the metric system.
  • What is the difference between gear and splines?
    Gears in a gear train are intended for transmitting rotational movement between 2 shafts (while the axes of the shafts are not always parallel) and, in most cases, this transmission is combined with changing torque and rotational speed. The gears are used also for transforming rotational movement into linear movement. A splined joint is a demounted connection of two parts to transfer the torque from one to another. The torque is not changed here.
  • What is the difference between splines and serrations?
    Within this context, serrations represent a type of spline. The serrations feature V-shaped space between teeth. They are commonly used in small-size connections.
  • Qual è la prima scelta per Scanalature Gravose?
    • Per lavorazioni di scanaltura, utilizzare gli inserti DOVEIQGRIP TIGER con larghezze di 10 - 20 mm
    • Per lavorazioni di torni-scanalatura, utilizzare gli inserti SUMO-GRIP TAGB con larghezze 6 - 14 mm
  • Qual è la miglior geometria per lavorazioni di materiali duttili e gommosi?
    Utilizzare le geometria "N" . Disponibile con larghezze 3 - 8 mm per inserti esterni GIMN e larghezze 2 -5 mm per inserti interni GEMI/GINI.
  • Quali sono i gradi consigliati per materiali ISO-M / ISO-P?
    • La prima scelta per molte applicazioni è il grado IC808.
    • Se si necessita di un grado più duro con maggior resistenza all'usura utilizzare il grado IC807.
    • Se si necessita di un grado più tenace con maggior resistenza agli impatti (tagli interrotti) utilizzare il grado IC830.
  • Qual è il miglior grado per lavorazioni di materiali ISO-S (superleghe)?
    • La prima scelta è il grado IC806.
    • Per materiali ISO-S più duri (HRC>35) utilizzare il grado IC804.
  • Quali utensili di scanalatura vanno utilizzati su macchine automatiche?
    Utilizzare gli esclusivi utensili con serraggio laterale GEHSR/GHSR, con possibilità di serraggio frontale e posteriore per un accesso molto più semplice su macchine automatiche (rispetto al convenzionale fissaggio superiore).
  • Quali sono i gradi/geometrie consigliate per scanalatura e torni-scanalatura di ghise?
    Utilizzare gli inserti TGMA/GIA con geometria Ke gradi IC5010 o IC428
  • Quali sono i gradi/geometrie consigliate per scanalatura e torni-scanalatura di alluminio?
    Utilizzare gli inserti GIPA/GIDA/FSPA con tagliente positivo, molto affilato e spoglia superiore lappata nei gradi IC20 o PCD ID5. Per larghezze di 6 - 8 mm, gli inserti tondi FSPA sono la prima scelta grazie al sistema di serraggio superiore.
  • Quali soluzioni utilizzare per scanalature interne di fori con diametro ridotto?
    • Diametri del foro da 2 a 10 mm: utilizzare inserti PICCO su utensili PICCO ACE.
    • Diametri del foro da 8 a 20 mm: utilizzare inserti GIQR su utensili MGCH.
    • Diametri del foro da 12 a 25 mm: utilizzare inserti GEMI/GEPI su utensili GEHIR.
  • Come si possono ridurre le vibrazioni?
    • Lavorare con la minima sporgenza possibile;
    • Lavorare con giri/min costanti;
    • Ridurre i giri/min se necessario;
    • Ridurre la larghezza dell'inserto per diminuire le forze di taglio;
    • Per larghezze da 6 e 8 mm, utilizzare le lame Anti-Vibranti WHISPERLINE.
  • In quali casi si consiglia di utilizzare gli utensili JETCUT con refrigerazione interna?
    Gli utensii JETCUT sono consigliati per qualsiasi pressione del refrigerante applicata (10 - 340 bar) e per qualsiasi lavorazione, dato che garantiscono un flusso del refrigerante costante ed affidabile direzionato esattamente sul tagliente, migliorando sensibilmente durate e gestione del truciolo.
  • Does ISCAR provide the PENTA star-type blank inserts for final shaping?
    Yes. ISCAR's grooving line also consists of blank inserts to ensure customization for producing tailor-made profiles.
  • What are ISCAR’s priorities for PARTING OFF?
    • For general applications up to 38mm part diameter, use DO-GRIP style double-ended inserts
    • Above 38mm: Use TANG GRIP style –single ended insert
    • Up to 40mm diameter: Use PENTA IQ , a highly economical insert with 5 cutting edges
  • What is the best grade for machining steel (ISO P)?
    • IC808/908
    What is the best grade for machining stainless steel (ISO M)?
    • C830/5400
  • What is the best insert geometry / chipformer for machining steel?
    • Use "C" geometry, for example DGN 3102C
    What is the best insert geometry / chipformer for machining stainless steel?
    • Use "J" geometry, for example DGN 3102J
  • What are the most recommended tools and inserts for machining miniature parts?
    • First choice is ISCAR DO-GRIP style (double-ended inserts) which has positive geometry, for example DGN 3102J & DGN 3000P
      * Use tools with Short Head dimensions, for example DGTR 12B-1.4D24SH
    • Second choice is to use ISCAR PENTA CUT, an economical insert with 5 cutting edges, for example :
      * PENTA 24N200J020 IC1008 (insert)
      * PCHR 12-24 (tool)
  • What is the best tool for heavy duty applications?
    • Use ISCAR TANG GRIP (single ended) insert – choose width according to part diameter
    • For heavy duty applications ISCAR offers 5-12.7mm insert widths
    • IC830 is the most suitable grade
    • Recommended insert geometry /chipformer is "C" type
  • How to reduce the bur on the part?
    • Use an R or L style of insert - these inserts have a lead angle, so the cutting edge is not straight
    • Also use a positive cutting rake, for example: DGR -3102J-6D (6D =6 degrees lead angle)
    • It is highly recommended to reduce the feed by 50% at the final cut
  • How to improve insert lifespan?
    Analyze the failure phenomena and choose grade accordingly:
    Wear: use a harder grade such as IC808 or 807
    Breakages: choose a harder grade such as IC830
  • Which is the best insert for an interrupted cut?
    Use a negative cutting rake, "C" chipformer and IC830 grade
  • How to improve chip control when long chips appear?
    • Select the correct chipformer and cutting parameters in order to obtain good chip formation
    • Choose a more aggressive chipformer
    • To increase feed, please refer to ISCAR user guide
  • How to improve part straightness and surface?
    • Use neutral insert and a stable tool with the minimum overhang needed
    • Adjust the cutting parameters
  • Can a JETCROWN tool block carry different square adapters?
    Yes. A JETCROWN tool block is intended for mounting square adapters of different dimensions. An adapter is clamped on the block by use of a crown which is a specially designed part of the JETCROWN tool assembly that ensures pinpointed high-pressure coolant supply. Important to note that for each insert width a separate crown is required. Refer to ISCAR's catalogues and technical guides for more data.
  • Why has ISCAR introduced new tool blocks with a reinforced rib on the opposite side of the block in addition to the existing line of tool blocks in the LOGIQ-F-GRIP line?
    There are cases where the reinforced rib interferes and prevents clamping the ISCAR LOGIQ-F-GRIP block on typical turret positions. Such a problem can be solved by using the blocks which have the rib on the opposite side. In these cases, ISCAR has added blocks with another rib location to the LOGIQ-F-GRIP product line.
  • What is the recommended coolant flow rate?
    Depends on diameter. For example, the minimal flow rate for 6 mm SUMOCHAM is 5 liters per minute. For 20 mm, the minimal flow rate require is 18 liters per minute. For more information, please refer to SUMOCHAM user guide in our catalogue, page 491.
  • What is the recommended coolant pressure?
    Depends on diameter and tool length. For example, the minimal pressure for 6 mm SUMOCHAM on 8xD is 12 bar. For 25 mm SUMOCHAM on 12xD, the minimal pressure required is 4.5 bar. For more information, please refer to SUMOCHAM user guide in our catalogue, page 491.
  • What straightness can be achieved with the SUMOCHAM line?
    With a stable set-up, deviation may vary from 0.03 mm to 0.05 mm for each 100 mm of drilling depth. Important: Achieved results may vary due to machine, fixture, adaptation, etc.
  • What is the correct deep drilling cycle with the pre-hole and the next tool?
    In order to avoid mistakes, it is best to prepare the pre-hole with the same geometry that you intend to use for the subsequent deep drilling operation. For a more detailed explanation, please refer to our catalogue, page 492.
  • Is it possible to make boring operation with SUMOCHAM?
    No, the SUMOCHAM family is not designed for boring operations. Failure of the tool and insert may occur.
  • What is the recommended geometry for titanium?
    The first choice is ICG. The second choice is ICP.
  • Is it possible to regrind SUMOCHAM heads?
    Yes, ICP/ICK/ICM/ICN geometries can be reground up to three times. Please see a detailed explanation on pages 502-504 in our catalogue. Note: FCP/HCP/ICG/ICH geometries can be reground only at TEFEN.
  • What is the maximum permitted run-out for SUMOCHAM?
    To achieve best performance and tool life, radial and axial run-out should not exceed 0.02 mm. A detailed user guide can be found in our catalogue, starting on page 490.
  • Is it possible to use SUMOCHAM for interrupted cut operations?
    SUMOCHAM cannot withstand interrupted cut operations. Loss of clamping force of the tool may happen, eventually leading to falling out of the insert.
  • What solution does ISCAR recommend for hard materials?
    For hard materials we recommend our SCD-AH solid carbide drills made from IC903 grade, or a semi-standard option for SUMOCHAM line, the ICH heads.
  • What type of adapter is recommended?
    The recommended adapter is the one that is most suited for the tool's shank. For example, if the shank is round, the most accurate adapter would be of the HYDRO type. Please refer to page 829 in our catalogue.
  • What should be the maximum exit be for the SUMOCHAM exit hole?
    The exit for the materials should not be more than 2-3 mm less than the diameter edge of the insert.
  • What is your recommended solution for aluminum machining?
    Answer: Depends on the application. SUMOCHAM line has ICN inserts, which offer a dedicated solution for rilling non-ferrous materials.
  • What are the criteria to look for to indicate when SUMOCHAM heads are worn out?
    It is best to measure wear on a microscope. Additional indicators for wear are illustrated on page 493 in our catalogue.
  • Which hole is considered as "short" and which as "deep"?
    Commonly used terms “short” and “deep” holes do not have a strict definition. It is widely accepted that drilling a hole of diameter d and (10…12)×d or higher in depth relates to deep drilling, while holes having depth up to 5×d, are short.
    In the terminology used by ISCAR, only a drilling depth of 12×d and higher is considered as deep. Consequently, the holes with shallower depths are short.
  • What is a cutting length series of drills?
    The drills vary in their cutting length. In general, tool manufacturers normalize the drills by cutting length series (short, regular, etc.), according to the ratio "cutting length/drill diameter". At ISCAR, drills intended for machining short holes are usually divided into the following length series: short (up to 3×d), long (4×d and 5×d) and extra-long (8×d and 12×d).
  • Why is a center drill referred to as a "countersink" and even as a "spot drill"?
    A center drill is needed for forming a conical hole in workpieces. This hole is used for supporting the workpieces by the centers of machine tools. One of the methods for forming conical holes is countersinking - machining by a specially designed cutter, a countersink. In fact, the center drill performs a combination of two operations simultaneously: drilling and countersinking. Therefore, the center drill is often referenced as a “combined countersink”. Sometimes, a center drill is considered a spot drill; however this specification is not strictly correct. A spot drill only drills but a center drill performs two operations: drilling and countersinking, therefore “spot a hole” and “drill a center hole” are not the same.
  • In center drilling, does a Multi-Master replaceable solid carbide head offer a real alternative to reversible high-speed steel (HSS) drill bits?
    Reversible HSS center drill bits are the most popular tools for center drilling: they are simple, always available for purchase, and feature low prices. The Multi-Master replaceable solid carbide head enables significant increases in cutting speed and feed, resulting in higher productivity and reduced machining costs, especially in cases of machining difficult-to-cut material. In addition, the tool life of the head is much longer. A brief economical calculation will show the preferred alternative for each case.
  • Is a chip-splitting cutting geometry suitable for drills of a relatively small diameter?
    A chip-splitting cutting geometry may be used in drilling tools. There are different drill cutting edge designs with chip splitting grooves, for example the SUMOCHAM ICG heads. Splitting chips into small segments improves chip evacuation and cutting speed. Under the same cutting conditions, a straight-style edge ensures better surface finish. Therefore, chip-splitting geometry is suitable mainly for rough drilling operations.
  • What are the advantages of the concave, pagoda-shape, cutting edges of SUMOCHAMIQ exchangeable drilling heads?
    The shape of the cutting edge substantially enhances the self-centering capability of the drill and enables drilling holes of depths up to 12×d directly into solid material, without pre-drilling a pilot hole. In addition, the HCP geometry facilitates gradual penetration into machined material which reduces the cutting forces, obtaining better hole quality – particularly when the drilling depth is significant.
  • What are the advantages of chamfering rings for drills?
    A chamfering ring is intended for mounting in the body of a standard drill in the desired position according to the drill tip. The ring mounting configures a combined holemaking tool that can perform drilling and chamfering in one operation.
  • Is it possible to regrind LOGIQ3CHAM 3 flute exchangeable drill heads directly at the customers' premises?
    Regrinding new geometries of these 3 flute drill heads is complicated and cannot usually be done locally.
  • What are the ISCAR products for deep drilling?
    ISCAR's line of deep drilling tools comprises gundrills and drills for ejector and single tube (STS) systems.
  • Can the SUMOCHAM drills be mounted in FLEXFIT threaded adaptors and tool holders?
    ISCAR produces modular drills combining SUMOCHAM design with a FLEXFIT threaded connection to enable mounting. A wide range of FLEXFIT threaded adaptors and flatted shanks ensures configuration of the assembled drill with a maximally shortened overhang, so that the modular drills can be used on machines with limited space for tooling (for example on multi-spindle and Swiss-type machines).
  • Do the terms "step drill" and "subland drill" mean the same?
    Not exactly. A step drill is a drill with cutting areas of different diameters to generate a step-diameter hole in one pass. A subland drill is a solid twist step drill, which features different lands for each diameter. However, a step twist drill has the same land along the drill body. Usually, there are two drilling areas in a subland drill. A subland drill is a sub type of step drill.
  • When should a carbide guide pad in a deep drilling tool be reversed or replaced?
    Even though the guide pads do not cut material, they, like carbide cutting inserts or heads, are subject to wear. A damaged or worn out guide pad causes unacceptable roughness and scratching of the machined hole surface.
    The pads should be thoroughly examined visually before applying a drill. If a pad is damaged or the pad working corner wears out approximately 70% of the corner width, the pad should be reversed or replaced.
  • What is a stub drill?
    Commonly called a twist drill with a shortened length of flute to make the drill stronger and more rigid.
    Stub drills are often referred to as extra-short-length drills.
  • What is the main application of ISCAR's flat drills and drilling heads?
    The main application of these tools is their drilling hole with a nearly flat bottom. For example, counterbores for screw heads, spring seats, seal housings, etc.
    The advantage is that no pre-drilling is required when drilling directly into solid materials.
  • ISCAR's product range of tools for machining composite materials includes solid carbide drills with PCD nibs and wafers.
    Can these drills be resharpened?
    Yes, they can. Both drill types have a large area for multiple regrinding and can be reground several times.
  • Which drills are considered as micro drills?
    Even though there is no general definition, drills in a diameter of less than 2-3 mm (0.08-.125") are often referred to as micro drills. Sometimes, such drills are also named "small-size drills".
  • What is a drill mill?
    It is a combined rotating tool that comprises two cutting sections: a drill tool and milling peripheral cutter. The drilling tool is intended to drill a hole. By combining the milling cutter, the hole can be enlarged.
  • Does ISCAR provide flat bottom drills with 3 flutes?
    ISCAR LOGIQ-3-CHAM family comprises 3 flute flat bottom drilling heads which can be mounted on any drill type related to this family, to create a flat bottom hole in solid material without pre-drilling.
  • What is the MODUDRILL?
    ISCAR's MODUDRILL is a modular drilling tool system. A typical MODUDRILL tool is an assembly of tools which comprises a steel body and exchangeable drilling heads mounted on the same body. There are two types of the heads: the first with guide pads carrying indexable carbide inserts, and the second with replaceable CHAM-IQ-DRILL solid carbide heads. In addition, the system contains a steel extension that can be mounted on the body to increase the drilling depth.
  • What is an NC spotting drill?
    An NC spotting drill (also referred to as a NC spot drill) is a precise drill that features a small cutting depth, typically around the height of a drill point. NC spotting drills are intended mainly for pre-drilling an accurate location and to ensure precise and fast subsequent drilling operations without guide bushings, especially on CNC machines. Typically, the NC spotting drills have a 90-degrees point angle.
  • What is peck drilling?
    In peck drilling also referred to as drilling with peck feed or simply "pecking", a drill is repetitively retracted to evacuate chips to dissipate heat.
  • What is a circuit board drill?
    A circuit board drill is a high-precision micro drill that is intended for drilling composite laminates – the main material for producing printed circuit boards, referred to as printed wiring boards (designated as PCB and PWB).
  • What is 'thrust force' in drilling?
    In drilling, the thrust force is an axial force that acts in the feed direction. This force compresses the drill along its axis. The thrust force is the resulting force of axial loads on the chisel edge, the major cutting edges (lips), and the minor cutting edges of a drill, while approximately 50% of the thrust force falls on the chisel edge.
  • What hole accuracy do ISCAR SUMOCHAM assembled drills with exchangeable carbide heads provide?
    ISCAR's SUMOCHAM assembled drills with exchangeable carbide heads provide hole accuracy in the IT10-IT9 ISO tolerance grades under normal cutting conditions.
  • Quando sono richieste operazioni di alesatura?
    Le operazioni di alesatura sono necessarie quando vengono richieste tolleranze e/o finiture superficiali molto strette e non possono essere raggiunte con la semplice foratura.
  • Per quali tolleranze sono disponibili gli alesatori standard?
    Gli alesatori standard ISCAR sono progettati per tolleranze IT7.
  • Gli alesatori standard sono disponibili per tutti i materiali?
    Gli alesatori standard sono disponili per la maggior parte dei materiali, ma per materiali ISO N e ISO S si consiglia di contattare direttamente ISCAR per la miglior soluzione possibile.
  • Qual è la durata media di un alesatore?
    Dato che molti fattori influiscono sulla durata (materiale, refrigerante, tolleranza, runout ecc) è molto difficile stimare la durata. Occorre quindi valutare ogni caso individualmente.
  • Risulta possibile alesare senza refrigerante?
    No. Alesare senza refrigerante è impossibile; la soluzione ideale è la refrigerazione interna, ma la refrigerazione esterna è un'opzione.
  • Quanto sovrametallo occorre lasciare prima dell'operazione di alesatura?
    Il sovrametallo dipende dal materiale lavorato, il diametro di lavorazione e l'utensile utilizzato per la preparazione del foro. In generale, può variare da 0.15 a 0.4 mm.
  • Qual è il maggior runout possibile del mandrino?
    Generalmente, il maggior runout è circa 0.01 mm, ma dipende anche da dimensioni e tolleranze richieste.
  • What is the main advantage an ISCAR's reamer with rolling devices?
    This reamer combines a BAYO-T-REAM high-speed reamer with a rolling device in one single tool. This ensures achieving an accurate hole with exceptional, mirror-like, surface finish.
  • What do letters "BN" and the number after them in designations of BAYO-T-REAM reaming heads mean?
    The letters "BN" in the designations of BAYO-T-REAM reaming heads refer to "bayonet number". The number after "BN" indicates the specific size of the bayonet connection to mount a solid carbide reaming head in a holder, such as BN5, BN6 and so forth.
  • Come incrementare la produttività per superleghe e materiali a base Nichel con i gradi ceramici ISCAR?
    ISCAR Offre un'ampia gamma di gradi ceramici, come IW7, per superleghe e materiali a base Nichel. I gradi ceramici ISCAR permettono di lavorare con velocità di taglio dieci volte superiori - da 150 m/min fino a 450 m/min. Questo incrementa sensibilmente la produttività.
  • Qual è la prima scelta delle geometrie ISCAR per lavorazioni di acciai?
    ISCAR ha introdotto tre nuove geometrie per finitura, lavorazioni medie e sgrossatura di acciai: F3P, M3P e R3P. Le geometrie, combinate ai gradi ISCAR SUMO TEC, assicurano maggior produttività, maggiori durate, miglior finitura superficiale e lavorazioni più affidabili. Le nuove geometrie generano temperature minori ed evitano il problema dell'incollamento del truciolo ad utensile e componenti. I trucioli vengono rotti in piccoli frammenti, evitando matasse intorno al pezzo e permettendo efficiente rimozione del truciolo dal convogliatore.
  • Come migliorare il controllo del truciolo con gli inserti CBN?
    Gli inserti CBN sono utilizzati principalmente per materiali con durezza tra 55 e 62 Rc. Gli inserti CBN convenzionali offrono un'ampia gamma di riporti piani e brasati che producono trucioli lunghi e arricciati in lavorazioni di acciai duri. Questi trucioli possono danneggiare la finitura del pezzo. La soluzione ISCAR è un nuovo inserto CBN con formatruciolo rettificato che assicura un ottimo controllo del truciolo in finitura e lavorazioni medie con elevata finitura superficiale.
  • Come ridurre le vibrazioni in lavorazioni con barre di barenatura con sporgenze superiori a 4xD?
    ISCAR offre una gamma di barre anti-vibranti con meccanismo interno di smorzamento delle vibrazioni. Questo riduce fino ad eliminare le vibrazioni utilizzando barre con sporgenze elevate. La nuova linea anti-vibrante è chiamata WHISPERLINE.
  • Come incrementare la produttività per ghise grigie con i gradi ceramici ISCAR?
    La ghisa grigia è universalmente riconosciuta come il materiale più diffuso nell'industria automobilistica. Per le lavorazioni di ghise grigie, ISCAR propone un'ampia gamma di gradi ceramici come IS6. Il grado IS6 è stato sviluppato appositamente per incrementare la produttività in lavorazioni di ghise grigie.
  • Qual è la prima scelta delle geometrie ISCAR per lavorazioni di acciai inox?
    ISCAR ha introdotto 3 nuove geometrie: F3M, M3M e R3M per finitura, lavorazioni medie e sgrossatura di acciai inox che combinate ai gradi ISCAR SUMO TEC, assicurano maggior produttività, maggiori durate, miglior finitura superficiale e lavorazioni più affidabili. La geometria F3M è dotata di angolo di spoglia positivo per un taglio dolce, minori forze di taglio e maggiori durate. La geometria M3M per lavorazioni medie è dotata di tagliente rinforzato ed angolo di spoglia positivo per taglio dolce e minori forze di taglio. La geometria R3M per sgrossatura di acciai inox con tagliente rinforzato ed angolo di spoglia positivo per minori forze di taglio.
  • Qual è l'effetto del refrigerante ad alta pressione?
    Il vantaggio principale degli utensili JETCUT è di erogare il refrigerante direttamente sulla zona di taglio per assicurare una refrigerazione efficiente per migliorare il controllo del truciolo ed aumentare le durate. I maggiori vantaggi dell'alta pressioni si riscontrano in lavorazioni di materiali come superleghe, acciai inox, titanio ecc
  • Does ISCAR provide tools for Y-axis turning?
    Yes, ISCAR provides these tools.
    Gradi Ceramici & Inserti
  • How to increase productivity of Ni-based and other superalloys with ISCAR ceramic grades?
    ISCAR has a wide range of ceramic grades, for example IW7, for machining Ni-based and other superalloys. Our ceramic grades have the ability to work 10 times faster in cutting speed, starting from 150M/min and going up to 450M/min which is 10 times higher than any conventional carbide inserts. This increases productivity dramatically.
  • Which chip formers does ISCAR recommend for steel machining?
    ISCAR has introduced three new chip formers for finishing medium and rough turning of steel: F3P, M3P and R3P. Combined with ISCAR’s SUMO TEC grades, the chip formers offer higher productivity, longer tool life, improved workpiece quality and more reliable performance. The new chip formers generate less heat and avoid the problem of chips attaching themselves to cutting tools and components. Chips are broken down into smaller pieces, preventing them from tangling around the workpiece and enabling more efficient removal from conveyor belts.
  • How to improve chip control with CBN inserts?
    CBN inserts are mainly for machining hard materials with high hardness - from 55 and up to 62 Rc materials. Conventional CBN inserts offer a wide range of brazed and flat tips that produce long and curled chips during the turning machining of hard steel, resulting in long chips that scratch the work piece and damaging the surface quality. The ISCAR solution is a new CBN insert with ground chip breaker on the cutting edge, which provides excellent chip control in medium to finishing applications with high surface quality.
  • How to reduce vibrations on boring bars with a high overhang of more than 4xBD?
    Throughout the world, machinists deal daily with problematic vibrations. ISCAR’s Research and Development department has designed and developed the WHISPERLINE range of anti-vibration tools to resolve this issue, including a boring bar with the dampening mechanism inside the body that eliminates and reduces vibrations when using bars with a high overhang.
  • How to increase productivity of gray cast iron with ISCAR ceramic grades?
    The most popular material in the automotive industry is gray cast iron. For machining gray cast iron, ISCAR offers a wide range of ceramic grades including IS6 SIALON inserts. Developed especially to increase productivity in gray cast iron, the IS6 SAILON grade can work 3 or 4 times faster in cutting speed - from 400M/min and up to 1200M/min which is 3 times higher than any conventional carbide inserts. This increases productivity dramatically.
  • What is ISCAR’s first choice in chip formers for stainless steel?
    ISCAR has introduced three new chip formers: F3M, M3M and R3M for finishing, medium and rough turning stainless steel. Combined with the most advanced SUMOTEC grades, the chip formers provide higher productivity, tool life and performance reliability. The F3M Chipformer has positive rake angles for smooth cutting, reduced cutting forces and insert wear, leading to dramatically increased tool life. The M3M Chipformer is designed for medium machining of stainless steel with reinforced cutting edge and Positive rake angle, to reduce cutting forces and ensure smooth cutting. The R3M Chipformer for chip breakers is designed for rough machining of stainless steel with reinforced cutting edge and positive rake angle, to reduce cutting forces.
  • What is the effect of high-pressure coolant?
    JETCUT tools have the ability to supply coolant directly into the cutting zone, ensuring high coolant efficiency, improved chip control, reduced heat and longer insert life. The high pressure coolant effect is applied to the machining of sticky and gummy materials such as super alloys, stainless steel, titanium etc.
  • Qual è il grado più adatto alla lavorazione di acciai inox
  • Qual è il grado più adatto alla lavorazione di superleghe?
  • Qual è il grado più adatto alla lavorazione su macchine con velocità ridotta ed instabili?
  • Qual è il minor passo consigliato per il profilo del filetto?
    Maggiore della dimensione dell'oning
  • Perché il rompitruciolo non agisce?
    Apparentemente la profondità di taglio non è sufficiente, quindi il rompitruciolo è inefficiente
  • Come si può migliorare il controllo del truciolo?
    Migliorare il controllo del truciolo è possibile con la corretta scelta dell'avanzamento: Radiale; Assiale; Alternato Radiale Assiale
  • Come si possono ridurre i tempi di processo?
    Utilizzare inserti multi-dente (2M, 3M). Questi inserti assicurano un minor numero di passate, riducendo i tempi di taglio. Sono disponibili per profili e passi più diffusi e rappresentano un'ottima celta per filettature economiche in produzioni massive.
  • Qual è la differenza tra profilo parziale e profilo completo?
    Profilo Parziale:
    • può lavorare per differenti filetti standard ed è adatto ad un'ampia gamma di passi con stesso angolo (60° o 55°).
    • Inserti con raggi ridotti adatti per il minor passo disponibile della gamma.
    • Per completare il diametro interno/esterno è necessaria un'operazione aggiuntiva.
    • Sconsigliato per lavorazioni massive.
    • Elimina la necessità di differenti inserti.
    Profilo completo:
    • lavora il profilo completo del filetto.
    • Adatto ai passi più diffusi.
    • Ideale per produzioni massive.
    • Lavora un singolo profilo.
  • Come scegliere la piastrina corretta?
    Utilizzare piastrine con inclinazione positiva in lavorazioni di filetti destri con utensili destri e di filetti sinistri con utensili sinistri. Utilizzare piastrine con inclinazione negativa in lavorazioni di filetti destri con utensili sinistri e di filetti sinistri con utensili destri. Utilizzare piastrine AE per utensili esterni destri e interni sinistri. Utilizzare piastrine Al per utensili interni destri ed esterni sinistri.
  • What is a tool material?
    In cutting tools, a tool material is the material from which the active (cutting) part of a tool is produced. This is the material that directly cuts the workpiece during machining.
  • How does ISCAR designate its tool materials?
    ISCAR’s system of designating tool material grades uses letters and numbers. The letters indicate the material group:
    IB – cubic boron nitride (CBN)
    IC – cemented carbide and cermet
    ID – polycrystalline diamond (PCD)
    IS – ceramics
    DT – cemented carbide with dual (CVD+PVD) coating
  • Cos'è un grado di metallo duro?
    Una combinazione di carburo, ricopertura e trattamento di post-ricopertura. Solo uno di questi componenti - il carburo - è l'elemento essenziale del grado. Gli altri sono opzionali. Il carburo cementato è un materiale composito che comprende particelle cementate da materiale legante (principalmente cobalto). I carburi cementati maggiormente utilizzati nel mondo dell'utensileria integrano un rivestimento anti-usura e sono conosciuti come "gradi ricoperti". Ci sono vari processi di trattamento che vengono eseguiti sul carburo già ricoperto (per esempio, la superficie della spoglia di un inserto). "Carburo cementato" può riferirsi sia al substrato di un grado ricoperto sia ad un grado non ricoperto.
  • ISCAR come classifica i gradi?
    Lo standard internazionale ISO 513 classifica i materiali da taglio in base alla gamma applicativa in riferimento ai materiali da lavorare. ISCAR ha adottato questo standard e utilizza lo stesso approccio nello sviluppo di nuove soluzioni. I carburi cementati sono materiali molto duri che possono tagliare la maggior parte dei materiali, che sono più soffici. Alcuni gradi dimostrano migliori performance rispetto ad altri in lavorazioni di specifiche classi di materiali.
  • I gruppi applicativi dei gradi a norma ISO 513 includono lettere e cifre dopo la lettera? Cosa significano?
    Le lettere definiscono la classe dei materiali da lavorare. Le cifre definiscono il rapporto durezza-tenacità su scala arbitraria. Ad un numero maggior corrisponde un maggior grado di tenacità ed un minor grado di durezza.
  • Cosa è la tecnologia SUMOTEC?
    SUMO TEC è uno specifico trattamento di post-ricopertura sviluppato da ISCAR. Il trattamento assicura superfici uniformi, minimizzando gli stress interni e le impurità del rivestimento. In rivestimenti CVD, a causa della differenza nei coefficienti di espansione termica tra il substrato ed i livelli di rivestimento, vengono generati stress di tensione. Anche in rivestimenti PVD si generano impurità. Questi fattori influiscono negativamente sul rivestimento, riducendo le durate inserto. Le tecnologie di post-ricopertura SUMOTEC riducono sensibilmente fino a rimuovere questi difetti, assicurando così maggiori durate e maggior produttività.
  • Perchè i rivestimenti PVD con nano strati sono considerati così efficienti?
    I rivestimenti PVD sono stati introdotti alla fine degli '80. Con l'utilizzo delle più avanzate nanotecnologie, i rivestimenti PVD hanno fanno enormi passi in avanti nella risoluzione di problemi molto complessi. Infatti è stato possibile sviluppare nuove tipologie di rivestimenti nano stratificati resistenti all'usura. Questi rivestimenti sono composti da combinazioni di strati con spessore fino a 50nm (nanometri) che incrementano sensibilmente la forza del rivestimento.
  • La descrizione dei gradi ISCAR generalmente inizia con le lettere "IC". Come mai il grado DT7150 (DO-TEC) ha una descrizione differente?
    La tecnologia di rivestimento ha due principali aree - CVD: deposizione chimica da vapore e PVD: deposizione fisica da vapore. Lo sviluppo tecnologico permette di combinare entrambi i metodi - CVD e PVD - per i rivestimenti inserto, che permette un maggior controllo delle proprietà del rivestimento. Il grado ISCAR DT7150 è composto da un tenace substrato e da un doppio rivestimento MT CVD (CVD a Media Temperatura) e TiAlN PVD. Il grado è stato inizialmente sviluppato per incrementare la produttività in lavorazioni di ghise dure.
  • Why are several of ISCAR’s carbide grades referred to by customers as “sun tan” grades?
    Some PVD coated (like IC840 or IC882) and CVD coated (IC5820, for example) carbide grades, originally developed for machining ISO S and ISO M materials, feature a bronze chocolate color. The “sunbathed” appearance of the inserts produced from these grades resulted in the shop talk definition “sun tan” grade.
  • What are the fundamental differences between these commonly used definitions: "ultra-fine", "submicron" and "fine" carbide grades?
    Each of these definitions relate to the size of the carbide grains in a carbide grade substrate. Sizes may slightly differ for various standards and norms of carbide product manufacturers, but usually they refer to the following:
    1 - 1.4 μm (40 - 55 μin) grain size         fine grade
    0.7 - 0.9 μm (27.5 - 35 μin) grain size   submicron grade
    0.2 - 0.6 μm (8 - 24 μin) grain size        ultra-fine grade

    In addition, depending on the grain size, there are medium, coarse, extra coarse and even nano carbide grades. The last, for example, features extremely small grain sizes: less than 0.2 μm or 8 μin.
  • Which terms are correct: "cemented carbide", "tungsten carbide", "wolfram carbide" or "hard metal"?
    All four terms refer to cemented tungsten carbide. "Tungsten" is another name for the chemical element Wolfram. (Incidentally, the word origin is Swedish, meaning "heavy stone").
    In the field of cutting tool manufacturing, the terms "cemented carbide", "tungsten carbide" and the abbreviation "HM" (hard metal) are usually used.
  • Quali sono le principali proprietà dei materiali da taglio ceramici?
    Rispetto al metallo duro, i gradi ceramici sono dotati di resistenza al calore ed inerzia chimica decisamente maggiori. Questo significa che assicurano velocità di taglio decisamente superiori ed eliminano usura per diffusione. I gradi ceramici hanno una minor resistenza alle scheggiature – questo enfatizza l'importanza della preparazione del tagliente come fattore fondamentale.
  • Quali sono le principali tipologie di ceramica?
    Ci sono due tipologie principali: Base Al2O3 Base Si3N4 Ceramica con base Al2O3 include le tipologie pure ("bianca"), miste ("nera"), e rinforzate. Ceramica con base Si3N4 può essere suddivisa in svariate tipologie, in base al contenuto, alle proprietà meccaniche ed alla tecnologia di produzione. Le ceramiche SiAlON generalmente fanno parte di questa categoria. Come materiale da taglio, la ceramica si posiziona tra il metallo duro e PCD & CBN, in base alle caratteristiche di tenacità-durezza.
  • Quali sono i vantaggi della ceramica rinforzata whisker?
    Le ceramiche whisker sono a base Al2O3 sono rinforzate tramite dispersione uniforme di carburo di silicio whisker. Sono dotate di maggior durezza e forza rispetto alle ceramiche non rinforzate, che permette migliori performance di taglio.
  • Cos'è il sialon?
    Sialon o, più precisamente, SiAlON, è una tipologia di ceramica che comprende silicio (Si), alluminio (Al), ossigeno (O) e azoto (N). SiAlON potrebbe essere condirata come ceramica a base nitruro di silicio ma presenta minor tenacità e maggior resistenza all'ossidazione. Risulta più semplice la produzione di SiAlON rispetto ad altre ceramiche a base nitruro di silicio.
  • Cos'è il cermet?
    La parola "cermet" è formata da "ceramica" e "metallo". Definisce un materiale composito artificiale spesso prodotto dalla tecnologia della metallurgia delle polveri. Il cermet è una tipologia di metallo duro dove le particelle dure sono rappresentate da composti a base di titanio anziché tungsteno. Rispetto ai gradi di tungsteno, il cermet ha maggior resistenza all'usura per abrasione e ossidazione, ma la tenacità è decisamente inferiore. Inoltre, il cermet è molto sensibile ai carichi termici.
  • What is the difference between CBN and PCBN?
    Both CBN and PCBN relate to Boron Nitride (BN) - a polymorph material formed by two chemical elements. Boron Nitride exists in different crystal structures. One is cubic and the BN in this structure is Cubic Boron Nitride (CBN).
    As a cutting tool material, CBN is used as a polycrystalline compound, where CBN particles and an added binder are sintered together. The material produced is "Polycrystalline CBN" or simply "PCBN". The percentage of CBN can vary in different PCBN grades. In the context of cutting tools, the commonly used abbreviations "CBN" and "PCBN" may be considered as synonyms.
  • Can the cutting ceramics, CBN and PCD be applied to machining titanium?
    Cutting ceramics and cubic boron nitride (CBN) are not suitable for machining titanium, although polycrystalline diamond (PCD) has proved itself in finish machining titanium in several cases.
  • Does ISO 513 standard relate to cemented carbides only?
    The answer is no. This ISO 513 standard specifies application and specification of hard cutting materials such as cemented carbides, ceramics, diamond, and boron nitride.
  • What is the main application of diamond-like carbon (DLC) coated tools?
    DLC-coated tools are intended mostly for machining aluminum and non-ferrous materials (ISO N group of application).
  • Which cutting materials are referred to as ultra-hard?
    Usually, diamond and cubic boron nitride (CBN) are the two hardest cutting materials considered as ultra-hard.
  • What is the difference between TiAlN and AlTiN coatings?
    The main difference between titanium aluminum nitride (TiAlN) or aluminum titanium nitride (AlTiN) coatings is the content of aluminum which is not above 50% with reference to TiAlN, and more than 50% in AlTiN. The dominating metallic element is written first in the coating formula.
  • What is a superlattice?
    In cutting tool coatings, this is another term for multi-layer nano coating.
  • What is the main function of coatings in cutting tools?
    The main function of cutting tool coatings is to improve the wear strength of a tool, specifically to increase resistance to abrasion, adhesive wear, and to provide thermal protection for prolonged tool life.
  • What is the advantage of natural diamond as a tool material when compared to synthetic polycrystalline diamond (PCD)?
    The monocrystalline structure of natural diamond provides a perfect cutting-edge contour without any junction points. This feature provides a substantial advantage to ensure ultra-high, really "mirror" surface finish required in some applications such as machining crucial parts of optical equipment. In contrast, a PCD cutting edge is formed by various crystals. This produces appropriate junctions on the edge, consequently every junction produces its own trace on a machined surface.
  • Which PCBN grade is considered to possess high CBN content and which has low?
    This subject is not defined, yet depending on CBN percentage the PCBN grades are divided according to:
    - high-CBN-content grades (85% and more),
    - low-CBN-content grades (about 55%).
  • What is MT CVD?
    In cutting tools, MT CVD is a method for coating products made of cutting materials, specifically replaceable inserts from cemented carbides, based on chemical vapor deposition (CVD). Additional letters "MT" are "medium" (sometimes also referred to as "moderate") "temperature" as MT CVD utilizes temperatures around 800°C (1470°F). This is significantly lower when compared to 900-1000°C (1650-1830°F) that feature typical CVD coating process.
  • What is HSS-PM?
    HSS-PM is the abbreviation that relates to high-speed steel (HSS), produced by use of powder metallurgy (PM) technology.
  • When giving recommendations about cutting data, how does ISCAR classify engineering materials?
    ISCAR material groups are organized in accordance with international standard ISO 513 Classification and application of hard cutting materials for metal removal with defined cutting edges — Designation of the main groups and groups of application and technical guides VDI 3323 Anwendungseignung von Harten Schneidstoffen (English: Information on applicability of hard cutting materials for machining by chip removal). VDI (Verein Deutscher Ingenieure) is the Association of German Engineers.
  • The ISO 513 standard specifies cutting tools intended for machining stainless steel as the tools that apply to Group M. Is this correct?
    In ISO 513, Group M (yellow identification color) relates to the tools for machining stainless steel of austenitic and austenitic/ferritic (duplex) structure. Ferritic and martensitic stainless steel belong to Group P (blue color) and starting cutting data should be set accordingly.
  • Is machining titanium like machining austenitic stainless steel?
    Commercially pure titanium and, with some applications, α- or α-β- titanium alloys may be machined like austenitic stainless steel but not treated β- and near-β- alloys.
  • What is “titanium beta”?
    “Titanium beta” is an expression that occurs in aerospace industry lingo/shop talk. It can refer to two different materials - a β-annealed α-β- titanium alloy or, rarely, a β-alloy. Therefore the expression should be exactly specified before using it, or even avoided to prevent possible misunderstanding.
  • Why is the machinability of materials from ISO M and S groups considered together?
    These materials are difficult-to-cut materials and have common features that affect machinability: low thermal conductivity and high specific cutting force.
  • Does cast iron relate to ISO Group K?
    The majority of cast iron grades (grey, nodular, malleable) relate to Group K.
    When machining hardened or chilled cast iron, appropriate cutting tools (and corresponding cutting data) should be chosen as recommended for Group H.
    Austempered ductile iron (ADI) in its soft condition is connected with Group P.
    Austempered ductile iron (ADI) in its hardened condition is connected to Group H.
  • Which steel is pre-hardened and which is hard?
    Steel producers supply steels in different delivery conditions: annealed, pre-hardened, hardened. The loosely defined term "pre-hardened steel" relates to steel that is hardened and tempered to a hardness that is not too high - generally this is less than HRC 45. The terms "pre-hardened" and "hard steel" are allied to cutting tool development and the ability of the tools to cut material. Commonly, the steels can be divided into the following conditional groups depending on their hardness:
    • Soft (annealed to hardness up to HB 250)
    • Pre-hardened to two ranges:
      - HRC 30-37
      - HRC 38-44
    • Hardened to three ranges:
      - HRC 45-49
      - HRC 50-55
      - HRC 56-63 and more

    As for "hard steel", usually it refers to steel hardened to HRC 60 and more.
  • What is Ebonite and how to machine this material?
    Ebonite is a hard vulcanized rubber containing a high percentage of sulfur. For the purpose of identifying a suitable tool and appropriate cutting data, Ebonite is characterized by ISCAR material group 30 (ISO N application class). To machine Ebonite effectively, we advise following ISCAR’s recommendations for this group.
  • Are hard metal and heavy metal the same?
    In metalworking, "hard metal" is a commonly used name for cemented carbide, which is a sintered hard material based on wolfram (tungsten) carbide. Cemented carbide is often referred as simply tungsten carbide. It is the main cutting tool material used today.
    Heavy metals are metals with high atomic weight or density. In the metalworking industry, the term “heavy metal” usually refers to heavy metal alloys, which are sintered composite materials containing 90% or more tungsten.
  • What is the difference between duplex and super duplex stainless steels?
    Duplex stainless steel has a two-phase metallurgical structure: austenitic-ferritic, approximately in equal shares.
    Super duplex stainless steel is a type of duplex stainless steel that contains an increased percentage of chromium and molybdenum for better corrosion resistance.
    From a machinability point of view, these steels are hard-to-cut.
  • Is machining common in manufacturing plastic products? What is the machinability of plastics?
    It is really hard to imagine life today without plastics - organic materials based on synthetic or natural high-molecular compounds (polymers). Plastic products surround us everywhere. Step by step, plastics have replaced traditional materials in many industrial fields, and today plastic is considered one of the most important structural materials. Manufacturing plastic parts is connected mostly with chemical processes; however, for some cases machining is also required. From the point of view of technology, there are three major classes of plastics: thermoplastics, thermosets, and elastomers. According to their use, plastics may be divided into commodity plastics and engineering plastics. Machining is more common for producing parts from engineering plastics, which are represented primarily by thermoplastics. Plastics have very good machinability. In comparison with metals, cutting plastics is performed usually with much higher speeds and feeds, while the applied cutting tools feature significantly less wear. However, selecting appropriate cutting tools is essential to obtain the accuracy required and excellent surface finish.
  • What is Vitallium and how to machine this material?
    Vitallium is a cobalt (Co)-chrome (Cr) alloy that contents approximately 60% of Co, 30% of Cr, 8% of molybdenum and some other elements. Vitallium was developed in the 1930's, and is now used mainly in joint replacement surgery and dental medicine. The alloy is hard-to-machine. Cutting data should be set according to recommendations, related to ISCAR material groups 34 and 35.
  • What is the difference between stainless steel and corrosion resistant steel?
    These definitions are generally used synonymously, along with definitions such as rust-resistant steel, inox steel, and non-corrosive steel.
    In fact, stainless steel may actually be divided into the following types according to their main functional features:
    • Corrosion-resistant steel, resistant to corrosion under normal conditions
    • Oxidation- or rust-resistant steel, resistant to corrosion under high temperatures in aggressive environments
    • Heat-resistant or high-temperature steel that does not change its strength under high temperature stress
    Therefore, corrosion-resistant steel can be considered as a type of stainless steel.
  • What are the main difficulties in machining workpieces from high temperature superalloys with honeycomb structures?
    The main difficulty in machining these workpieces is low workpiece stiffness, caused by the workpiece's thin-wall structure. Due to the honeycomb structure, a workpiece often cannot be clamped properly, which results in a further reduction in the entire technological system's rigidity.
  • What is Nitinol and what is its machineability?
    Nitinol, also referred to as Nickel Titanium or Ni-Ti, is an intermetallic alloy of Nickel and Titanium. Machining of Nitinol causes intensive abrasion and oxidation wear on the cutting tool. In addition, cutting speed substantially affects tool life - if the speed is too slow or too high, tool life drops dramatically. In general, tools intended for the ISO S application group are used for machining Nitinol.
  • Which stainless steel is considered as super austenitic?
    Super austenitic stainless steel is austenitic stainless steel, which features high content of Molybdenum (more than 6%) and increased percentage of Chromium and Nickel. The combination of materials results in high resistance to pitting corrosion. Usually austenitic stainless steel with pitting resistance and an equivalent number (PREN) of more than 40 is super austenitic. Generally, super austenitic stainless steel has less machinability characteristics when compared to austenitic stainless steel.
  • What is "pitting resistance equivalent number"?
    The "Pitting resistance equivalent number" (PREN) is a conditional value that characterizes theoretical resistance of stainless steel to pitting corrosion based on the stainless-steel content. There are several ways to calculate PREN by use of equations.
  • What is "mild steel"?
    "Mild steel" is another name for low carbon steel.
  • What are the main difficulties in machining Hadfield steel?
    Hadfield steel has a high content of Manganese: 12% in average, and therefore often referred to as "manganese steel". It has austenitic structure which ensures high abrasive wear resistance combined with excellent impact toughness and high ductility. When machined, this steel hardens and adversely impacts machinability. Due to the high ductility of austenite and its tendency to work hardening, Hadfield steel is a very difficult-to-cut material.
  • What should be taken into account when machining Beryllium and its alloys?
    In machining Beryllium (Be) and its alloys, the fine Beryllium dust generated while cutting the material can be dangerous to health. It is essential to use machine tools equipped with appropriate chip collecting units.
    Due to Beryllium’s high brittleness, the machined surface may be damaged during machining by microcracks and microflow. To avoid surface damage, the machining process should be under control - rigid workpiece clamping and eliminating vibrations are extremely important.
    Beryllium bronze, which is also known as beryllium copper or BeCu, has good machinability. When machining this alloy, users should follow ISCAR's recommendations regarding the cutting data that relates to copper alloys.
  • What is Zamak and how to machine it?
    Zamak, also referred to as ZAMAK, ZAMAC, or Zamac, is a group of zinc-based alloys. The principal alloying elements are aluminum, magnesium and copper. These alloys feature good machinability and their cutting usually does not cause difficulties. ISCAR's tools for the ISO N group of applications are recommended for machining Zamak.
  • Which cast iron is named "vermicular" and what is its machinability?
    Vermicular cast iron is another name for compacted graphite iron (CGI). The structure of this iron features vermicular (worm-shaped) graphite particles.
    According to its machinability properties, vermicular cast iron or CGI, falls between grey and nodular cast iron.
  • What is "bainitic ductile cast iron"?
    "Bainitic ductile cast iron" (BDCI) is another name for austempered ductile iron (ADI) that is also referred as "ausferritic spheroidal graphite cast iron".
  • What is the machinability of maraging steel?
    Usually maraging steel is machined in annealed conditions without any specific problems. When steel is aged (heat treated), its machining becomes more difficult. A general rule for selecting cutting tools and finding initial cutting data is to use the same recommendations as in the case of high alloy steel of the same hardness.
  • What is "Nichrome" and how is it machined?
    "Nichrome" is the name of a whole group of Nickel-Chromium alloys. It is also referred to as Chrome-Nickel, NiCr, Ni-Cr, etc. The well-recognized Nichrome 80 (Nichrome 80/20) comprises 80% Nickel and 20% Chromium. Other Nichrome grades may contain additional elements such as Iron.
    In machining Nichrome, the initial cutting data can be chosen as it’s recommended for Nickel-based superalloys.
  • Which materials are considered exotic?
    In addition to mainstream engineering materials such as iron-based alloys (steel, stainless steel, cast iron) and common nonferrous metal alloys (aluminum alloys, brass, bronze), there are exotic types of material that were developed to answer specific demands. These exotic materials feature a dedicated application; they are rare and not commonly used and are generally more expensive to fabricate.
    An accurate agreed definition of exotic material does not exist. Many experts refer to them as metals, like Beryllium, Zirconium, etc. and their alloys, ceramics, composites, and superalloys. When considering the use of structural materials, superalloys and composites should be distinguished first. Machining exotic materials can be difficult.
  • What is Stellite, and how to machine it?
    Stellite is a range of hard cobalt-chromium alloys that are used for wear resistance and tool materials.
    Stellite has poor machinability, approximately ten times less when compared with free-cutting steel. Therefore, machining Stellite by cemented carbide tools features very low cutting speeds, yet the speed can be significantly increased by applying cutting tools from whisker reinforced ceramic.
  • Come fresare Nylon 6?
    Nylon 6, consciuto anche come poliammide, è una resina polimerica termoplastica. Solitamente, i pezzi in nylon vengono prodotti con stampi, ma in alcuni casi è necessario deover lavorare questo tipo di materiale. Come regola generale, non ci sono problemi nella fresatura di nylon, ma potrebbero sorgere criticità come surriscaldamento, evacuazione truciolo e deformazione del pezzo a causa dell'elasticità del materiale. In fresatura, una tipica velocità di taglio iniziale è stimata in 400-470 m/min per frese ad inserti e 450-530 m/min. per frese a candela integrali e con testine intercambiabili. Quindi, in base ai risultati, la velocità di taglio può essere incrementata fino a 900-1000 m/min. Valori maggiori possono causare surriscaldamento, e quindi, sono sconsigliati. La refrigerazione ad aria direzionata sul tagliente, specialmente interna al corpo fresa è caldamente consigliata, per non dire necessaria.
  • Cos'è il "ferro puro" e come può essere lavorato?
    Ferro puro è il nome generale dell'acciaio a basso tenore di carbonio non legato con con contenuto olto elevato di ferro (Fe) con una traccia complessiva di altri elementi pari allo 0,1% Il ferro puro è denominato commercialmente come ARMCO (American Rolling Mill Corporation). Per lavorare il ferro puro, si consigli di seguire i parametri indicati per il gruppo 1 ISCAR (P1).
  • How to machine naval high-tensile steels?
    Naval steels include various high-tensile, high-yield, alloy steels that are used mostly in marine applications, particularly for hulls of vessels and submarines. Typical representatives of these steels are 100 HLES, HY-80, HY-100, and others.
    The general approach to machining high-strength steels is based on recommendations regarding alloy steels with similar strength and hardness characteristics.
  • What is PPSU and how is it machined?
    PPSU is an acronym of polyphenylsulfone - a type of high temperature thermoplastic. Therefore, when machining PPSU, follow ISCAR's recommendations related to cutting thermoplastics.
  • When specifying materials to be machined, ISO standards use the letter “P” for steel, “M” for stainless steel, and “K” for cast iron. These letters are not directly associated with the material. However, when designating non-ferrous metals, superalloys, and hard materials, the ISO standard uses the letters” N”, “S” and “H”, which are appropriate acronyms. Can you explain a reason?
    ISO adopted the material classification principles that were developed in Germany, and therefore, the origin of the identification letters is in German. For example, the letter “P” relates to the German word «Plastisch» (plastic), "K" to «Kurzspanend» (produced short chips), and "H" to "Hart" (hard), just to name a few.
  • Why does ISCAR continue to use outdated designations such as GGG for nodular cast iron when specifying engineering materials in different guides and ITA software?
    The answer is very simple, outdated designations are still common in the industry and used by the manufacturer. Designations that begin with "GG" for gray cast iron, "GGG" for nodular cast iron (according to the old DIN standards), or "En" for steel (according to the old BS standards), have been replaced by other designations in their appropriate standards. However, despite the newer and formal changes, various outdated material designations are the everyday language of the professional world. Therefore, modern designations have been simultaneously preserved with a few outdated designations, which remain popular among manufacturing professionals.
    As a side note, a similar situation may be observed with commercial names. Some materials are well known by their trademark and not by their standard designation.
  • What is considered high-temperature aluminum?
    Generally, high-temperature aluminum is an aluminum alloy with more than 12% silicon content. This aluminum alloy is hypereutectic (also referred as to "hypereutectic aluminum"), while low thermal expansion and low specific gravity makes the alloy a typical material for hypereutectic pistons. From a machinability point of view, the high-temperature aluminum features considerable abrasiveness.
  • What is "pure iron" and how can it be machined?
    Pure iron is the general name of low-carbon non-alloy steel that features an extremely high content of iron (Fe) with an overall trace of other chemical elements of up to 0.1%.
    Pure iron is referred to commercially as ARMCO (American Rolling Mill Corporation). Shop talk language refers pure iron as "Armco-Iron". Also, pure iron is referred to as "soft magnetic iron".
    To machine pure iron, it is recommended to follow ISCAR’s Group 1 (P1) - Material Group Classification guide when selecting the suitable cutting tool and determining the initial cutting data.
  • How to distinguish cold-rolled and hot-rolled steels by their designation?
    Terms "hot rolled" or "cold rolled" relate to steel fabrication methods, and do not specify the composition or the mechanical properties of a steel, which are generally the main parameters for steel designation systems. However, in some cases technical documentation may use these terms or their abbreviations such as HR or CR for highlighting the method of fabrication.
  • High temperature superalloys comprise several types of materials. How can the machinability of these materials vary depending on the material type?
    High temperature superalloys (HTSA) are divided into the three following groups depending on the prevailing element: iron (Fe)-, nickel (Ni)- and cobalt (Co)-based superalloys. Generally, machinability drops in the same order: from Fe- to Co-based HTSA. In addition, material fabrication method (casting, forging, sintering etc.) have impact on machinability within the group, too.
  • From the machinability point of view, are iron-based high temperature superalloys comparable with difficult-to-cut austenitic stainless steels?
    Yes, correct.
  • What is "CPM steel"?
    Acronym "CPM" means Crucible Particle Metallurgy – a powder metallurgy method of steelmaking which was developed by Crucible Industries.
  • How to machine Alumina Ceramics?
    Alumina Ceramic is a general name for a whole group of aluminum-oxide-based ceramic materials that differ in the aluminum oxide (alumina) percentage and their substantial, properties. Due to the high hardness and low thermal conductivity, more common methods to machine Alumina Ceramics are abrasive machining, electro-discharge machining, laser-assistant cutting and others. As for "traditional" cutting, applying carbide tools usually requires the tools to be diamond coated. At the same time, some Alumina Ceramics grades of relatively low hardness (around 85 Shore D) may be machined by commonly coated carbide tools.
  • What is "cupronickel" and its machinability?
    Cupronickel, which is also referred to as "copper nickel", "nickel copper" and "cupro-nickel", is a cooper alloy with Nickel as a main alloying element. Machinability of cupronickel is low when compared to common copper alloys.
  • What is "ultra-high carbon steel"?
    In some steel classification systems high carbon steel that is extremely rich in carbon (usually exceeding 1% but it depends on the system) is named as "ultra-high carbon". The definitions such as "UHC steel" or "very high carbon steel" and abbreviation "UHCS" are common for designating such steels. Ultra-high carbon steel has increased strength yet brittle.
  • Which group of stainless steels precipitation hardened (PH) stainless steel belongs to: martensitic or austenitic?
    Precipitation hardened stainless steel can be both martensitic and austenitic however, the most common of these steel types is martensitic. There is also semi-austenitic precipitation hardened stainless steel, which is austenitic when annealed, and martensitic when hardened.
  • Are austempered ductile iron (ADI) and austenitic nodular cast iron the same material?
    No, these are different types of cast iron.
  • What is K-Alloy?
    K-Alloy is a durable die-casting aluminum alloy that features high resistance to corrosion. K-Alloy also is referred as to A304.
  • What is free-cutting steel?
    Free-cutting (or free-machining) steel is a collective name for carbon steels that feature the increased content of Sulphur when compared to common carbon steels with similar Carbon percentage. This attribute provides better machinability and chip control.
  • What is Tungsten-Copper and how to machine it?
    Tungsten-Copper, which is also referred to as Copper-Tungsten, CuW, and WCu, is a composite material, a pseudo alloy, that contains Copper and Tungsten (Wolfram). Depending on the grade, the content of Copper (Cu) in this material typically varies between 10-50%. When compared to pure Tungsten, machining Copper-Tungsten is easier, and the higher the copper content, the better the machinability. Often the machinability of Copper-Tungsten alloys is like grey cast iron. However, effective machining of CuW grades with high copper percentage requires a more positive cutting geometry.
    Tool Holding
  • What is a tool holder?
    A tool holder is a device (a tool arrangement) for mounting a cutting tool in a machine tool. One of the tool holder ends carries the cutting tool while the other ends is clamped into the machine tool. Therefore the tool holder acts as an interface between the machine tool and the cutting tool.
  • Are the terms “tool holding” and “tooling” synonymous?
    “Tool holding” is also referred to as “toolholding” and usually relates to tool holding systems that comprise various tool holders, such as arbors, chucks or adaptors, and their accessories (extensions, reducers, rings, sleeves, etc).
    “Tooling” is a much broader definition. “Tooling” can refer to cutting tools together with tool- and work holding arrangements that are intended for a machine tool. “Tooling” relates sometimes to tool management and in certain circumstances it refers to tool holding systems.
  • Does ISCAR supply work holding devices?
    No, ISCAR does not supply work holding devices. ISCAR’s products are cutting tools, tool holding, and tool management systems.
  • Does ISCAR provide tool holders with polygonal taper shank?
    Yes. These tool holders are represented by ISCAR’s CAMFIX family.
  • What are the advantages of thermal (heat) shrink holders?
    The advantages of tool holding, based on clamping tools with cylindrical shanks with the use of heat shrink fitting, are as follows:
    • High accuracy
    • High rigidity
    • Excellent repeatability
    • Reaches deep cavities due to slim holder design
    • Balanced design and assembly’s symmetrical shape eliminate the production of centrifugal forces at high rotational speeds
  • Are ISCAR’s thermal shrink holders suitable for tools with steel shanks?
    Yes. ISCAR’s SRKIN thermal shrink holders are intended for clamping tools with shanks made from cemented carbide, high speed steel (HSS) and steel. The SRKIN product line is fitted DIN69882-8, which is the shrink holder market standard.
    ISCAR also produces SRK slim design shrink holders. SRK holders can be used for steel shanks but we recommend using them for carbide shanks.
  • Does ISCAR produce heating units for mounting cutting tools in thermal shrink holders?
    Yes, ISCAR produces the induction heating unit for thermal shrink tool holding. In addition to this unit, ISCAR provides its simplified, “starter” version, which was designed to help the end-user purchase the shrink holding technology in a low cost device.
  • What are the main design features of X-STREAM SHRINKIN products? In which field would applying these products be the most effective?
    X-STREAM SHRINKIN is a family of thermal shrink chucks with coolant jet channels along the shank bore. The family utilizes a patented design for holding tools with shanks, made from cemented carbide, steel or high-speed steel (HSS). The new chucks combine the advantages of high-precision heat shrink clamping with coolant flow, directed to cutting edges. X-STREAM SHRINKIN has already shown excellent performance in milling aerospace parts, particularly titanium blades and blisks (bladed discs), and especially in high speed milling. In machining deep cavities, the efficient cooling provided by the new chucks substantially improves chip evacuation and diminishes chip re-cutting.
  • What are the SPINJET products and where they are used?
    ISCAR’s SPINJET is a family of coolant-driven compact high speed spindles for small diameter tools. It is a type of “booster” for upgrading existing machines to high speed performers. Depending on pressure and coolant flow rate, the spindles maintain a rotational speed of up to 55000 rpm. The versatile SPINJET products have been successfully integrated in tooling solutions for milling, drilling, thread milling, engraving, chamfering, deburring, and even fine radial grinding. The SPINJET spindles are recommended for tools up to 7 mm (.275 in) in diameter, however the optimal diameter range is 0.5-4 mm (.020-.157 in).
  • Does ISCAR deliver tool holders with identification chips?
    ISCAR’s tool holders with HSK shanks incorporate holes for radio-frequency identification chips (RFID). ISCAR’s CAMFIX tool holders with polygonal taper shank of nominal size C4 (32 as specified by ISO 26623-1) and more are produced with this hole.
    ISCAR can provide RFID chip mounting for all types of tool holder by special request.
    Note: It is essential to adjust the tool holder after mounting an RFID chip.
  • Does ISCAR supply boring heads with digital displays?
    Yes. ISCAR’s ITSBORE family contains adjustable boring heads with digital displays. These heads feature high adjusting accuracy and a simple adjusting process. A clear digital display with a mm/inch value display selection helps to prevent human errors.
  • What is the difference between mandrel and arbor?
    There is no fundamental difference - both terms refer to a bar, usually rotating, that is used for mounting a machined workpiece or a cutting tool.
  • Does ISCAR supply tool holding devices for tapping?
    Yes. Tool holding products for tapping include quick-change ER-type collets, holders with straight shanks and with 7:24 taper shanks, for example:
    • GTI toolholders and straight shanks with floating compression/tension mechanism
    • GTIN compact product line for tappng based on ER collets
    • TCS/TCC quick-change system (part of the ITSBORE modular system)
  • What is "engineered balance"?
    Engineered balance is a general name for design methods to make the mass distribution of a rotary body theoretically symmetrical with the body axis. Using these methods, engineers tried to ensure required balance parameters in the design stage, before production. 3D modelling in a CAD system environment significantly expands the engineered balance possibilities. As the engineered balance relates to virtual objects, it cannot replace a "physical" balancing of real parts. However, an engineered balance design substantially diminishes the mass unbalance of a future product and makes "physical" balancing much easier.
    Engineered balance principles are a necessary feature for a skillful design of rotary tool holders.
    Products with an engineered balance design are sometimes referred to as "balanced by design".
    Shop Talk
  • Metal cutting, like other fields of industrial activity, has its own professional jargon that is often used in shop talk. We decided to devote a separate section to more common jargon, even though they may appear already in the other FAQ sections.

    6 and 9 - The shapes of curled chips, which are usually short, are often considered the most desirable in production.

    Asymmetrical index - This is the unequal angular pitch of a milling cutter.

    Back taper - Small reduction of the tool cutting diameter from the front to the rear along the tool length.

    BAHCO - Swedish company founded by Johan Petter Johansson, inventor of the plumber pipe wrench. Today, the word "Bahco" is also used as a slang term for an adjustable pipe wrench.

    Ball-end tool – A ball-nose tool.

    Ball mill – A ball-nose milling cutter. The correct meaning of “ball mill” is a grinding device for grinding materials into powder.

    Barrel - A barrel-shape milling cutter.

    Bird's nest, birds-nest chips - A clump of entangled metal swarf formed by long unbroken chips during the machining process.

    "Black" and "white" cutting ceramics – A commonly used classification of ceramic cutting materials according to their color. Pure alumina-based cutting ceramics are "white," while mixed ceramics comprising a composition of alumina with titanium carbide are "black".

    Bi-hex – a term that refers to a tool, key (wrench), or fastener with a 12-point or 12-corner shape. "Bi-hex" is also referred to as "bi-hexagonal" and "double hex".

    Bell mouth - Constant-velocity joint (CV joint).

    Bull-nose – A milling cutter, a replaceable milling head or insert of toroidal cutting profile.

    Button cutter – A toroidal milling tool. In most cases, a button cutter is referred to as a mill with indexable round (button) inserts.

    Chip mouth, chip throat, chip slot and chip gullet - These terms relate to the area of a cutting tool designed for chip flow during machining. The chip mouth and chip throat are usually shaped holes, and the chip gullet is a groove. In rotating tools, the terms "chip mouth" and "chip throat" are more common in hole making, while the terms "chip slot" and "chip gullet" are used more in milling.

    Cobalt chrome – A cobalt-chrome alloy.

    Cobalt steel – In the past this definition related mainly to AISI M35 high speed steel (HSS) but now is commonly used for designating HSS containing cobalt.

    Comb Cracks – Cracks that are usually normal at the cutting edge of a tool, caused mainly by variable thermal loading.

    Coupon – A test sample.

    Corn (corncob) milling cutter – A milling cutter, mainly in an endmill configuration, which features the outer surface having a dense but usually shallow mesh structure. The milling cutters of this type are also known as scaly mills.

    Crest Cut End Mill - Slang term derived from "CREST-KUT®" end mills; refers to a specific design featuring a wavy cutting edge, which was initially introduced for high speed steel milling cutters.

    Cubic – Metal removal rate (MRR) in cubic mm, cm or inches.

    Cutter sweep – In cutting tools with flutes such as endmills, drills, reamers etc., this is the area of material that is removed by a fluting tool (a milling cutter or a grinding wheel) at the end of a flute. The cutter sweep is also referred to as a "flute runout" - not to be confused with the runout of tool teeth!

    Cutting corner - Cutting edge, normally, of turning inserts.

    Decking - Machining the gasket-surface sections ("decks") of an engine block or/and a cylinder head to assure a required level of flatness.

    Die sinking – In die and mold making, this means machining 3D cavities, especially deep cavities.

    Dish – An angular clearance, which is made on an endmill face toward the endmill axis, to generate a flat surface. A dish is defined by a dish angle - the angle between the endmill minor cutting edge and a plane normal to the axis. A dish-concept design is common for endmills. However, flat bottom endmills feature zero dish angles.

    DN ratio – The product of the diameter of a main spindle bore and the maximum spindle speed. DN ratio, which is also referred to as "DN number", is often used as a criterium of high-speed machining (HSM).

    Duplex – Duplex (austenitic-ferritic) stainless steel.

    Exotics – Exotic materials.

    Facing, profiling, shouldering – In turning, these terms are used for specifying typical turning operations. In milling, they are "shop talk" words used instead of the full terms "face milling", "profile milling" and "shoulder milling".

    Feed mill – A fast feed (high feed) milling cutter.

    Fishtail cutter - A flat milling cutter for machining slots. Normally, such a cutter possesses a V-shape- or V-neck end. Sometimes, back draft endmills are referred to as fishtail cutters too.

    Flat drill – Normally, this is a synonym for a spade drill, but it often relates to a flat-bottom drill.

    Flood coolant - A cutting fluid that is supplied to a cutting zone from outside (externally) by a low-pressure jet nozzle.

    Flute wash, flute washout - In cutting tools with flutes, this is the non-cutting section of a flute outside the maximum length of cut also referred to as the flute run-out.

    Fluting – Machining grooves, mainly spiral.

    Fly bar, flybar – A fly cutter carrying two toolbit inserts.

    Gamma titanium – Titanium aluminide.

    Gamma titanium – Titanium aluminide.

    GDT – In manufacturing, Geometric Dimensioning and Tolerancing.

    Green insert - A pressed compact insert before the sintering process.

    Half hard – A term that describes the medium-hardness of steel. It is often used to specify austenitic stainless-steel sheets that have been hardened through cold work (rolling) rather than heat treatment. The hardness level of stainless steel can be designated as 1/4 hard, 1/2 hard and fully hard depending on its level of hardness.

    Hard carbon – Diamond-like carbon (DLC) coating.

    Hard chrome - Chrome plating intended for improving the performance characteristics of a part by increasing resistance to corrosion and abrasion wear. By contrast with decorative chrome the hard chrome plating is substantially thinner and used mainly for aesthetic purposes.

    Hard tooling – Custom tooling; also referred to as dedicated or special-purpose tooling.

    Herringbone – A herringbone-type milling cutter is usually a solid carbide endmill that features flutes combining left and right helix angles. Herringbone-type endmills are commonly used in machining composites, especially carbon fiber materials, where the left and right helix combination reduces delamination and compresses the material edges. Also referred to as a compression router.

    Higbee cut ("Highbee", "blunt start") - In threading, an additional cut that removes an incomplete thread at the end of a thread to provide a blunt thread start.
    A thread with a Highbee cut is also referred to as a "convoluted thread".
    The Highbee cut can be used in both internal and external threads.

    High positive – A feature of cutting geometry that relates mainly to the rake angle of a tool. For tools with high positive geometry, the rake angle is significantly greater than common values.

    High speed cobalt – A high speed steel with significantly increased content of Cobalt (typically 5 to 8%). This steel is also referred to as cobalt steel.

    Hipping – A term derived from the abbreviation HIP - Hot Isostatic Pressing.

    Hook, hook angle – A rake angle; as a rule, this term is referenced to saws and slitting cutters.

    Hoopster. – a specifically designed type of retaining rings that requires a shallow-depth groove for mounting.

    Hundredths, thousandths etc. - Hundredths, thousandths etc. of a millimeter or an inch depending on a chosen system of units.

    IC – The inscribed circle of an indexable insert relates to the diameter of such a circle. Also, IC stands for "ISCAR Carbide" in designations of ISCAR's cemented carbide grades.

    InconelInconel is the trade name for a group of more than 20 metal alloys made by Special Metals Corporation. When followed by a number (e.g. Inconel 625), it is a specific material from a family of nickel-chromium-based high temperature alloys. Without a number following, Inconel often refers to a whole group of nickel-based superalloys.

    Inox – Inox steel is a stainless steel. The term "Inox" comes from "inoxydable", the French word for stainless or inoxidizable.

    Inserted-tooth mill – a mill carrying replaceable cutting inserts, an indexable mill.

    Jo, Jo block - A gauge (Johansson) block.

    Jobber drill – An all-purpose twist drill, usually of medium length.

    K-factor – In cutting tools, K-factor may stand for the following:
    - Cutting edge form factor, which is the ratio of honed cutting-edge widths measured on a rake face and a flank.
    - Specific power factor (or power unit factor). Usually, this is the power (in kW, hp etc.), required to remove a unit volume of a specific material (in cm3, in3, for example) by cutting. However, in some cases this factor is determined in the opposite way, resulting in material volume to be removed by cutting when a unit power is applied.

    Ledloy, Ledloy steel - A grade of free cutting carbon steel that is commonly known by its trade name ("Ledloy" the copyright name of the Inland Steel Company's steel). The grade designation according to AISI is 12L14, a similar DIN/EN steel is 11SMnPb37 (W.-Nr. 1.0737). To improve machinability, lead is added to the steel composition. Therefore, this steel is often referred to as Lead Steel or mistakenly as Leadloy.

    Lens – An endmill with a convex cutting face (bottom) profile that is represented by the arc of a large-radius circle.

    Lollipop – A spherical milling cutter that features the wrapping angle of a cutting edge more than 180° (usually 220-240°).
    Sometimes, the lollipop cutter is also referred to as an undercutting mill or a bulb-type (bulb-shaped) mill.

    Master (gauge) insert – A specially selected insert mounted on a cutting tool to measure the tool dimensions or to check the tool accuracy parameters.

    Mic – a micrometer.

    Microtools – A broad definition of cutting tools that are very small in dimensions: from miniature to even microscopic. Therefore, a strict quantitative specification is difficult. In rotating tools, for example, tools with diameter less than 3 mm (.118") are usually related to microtools.

    Microtools – A broad definition of cutting tools that are very small in dimensions: from miniature to even microscopic. Therefore, a strict quantitative specification is difficult. In rotating tools, for example, tools with diameter less than 3 mm (.118") are usually related to microtools.

    Mill – Usually, a milling cutter but also may relate to a milling machine tool.

    Moly – Molybdenum [Mo]. Moly has an exceptionally high melting point and is mainly used as an alloy agent in steel.

    Nasty material – A difficult-to-cut material; often stands for a nickel- or cobalt-based superalloy.

    Necking, necking down – Machining a neck or undercut on a rotary-body-type part such as a shaft, axle etc.

    Necked-down endmill – An endmill with the shank diameter larger than the cutting diameter.

    Nirosta – Stainless steel, normally austenitic.

    Nose – Cutting corner.

    OD/ID machining - Machining external/internal cylindrical surfaces: "OD" refers to "outer diameter" and "ID" to "inner diameter".

    Orange peel, orange skin – The visually uneven texture of a material surface, which resembles the skin of an orange. In metalworking, it is often considered as an appearance defect, although in some cases an "orange peel" may be a specially planned type of decorative finish.

    Parallel land – The wiper flat of a milling cutter. The term "parallel" highlights that the land is generally parallel to the machined surface.

    Pecking – Drilling or countersinking with peck feed.

    Pic rail cutter – A milling cutter that is intended for machining the standard Picatinny rail profiles (male and female). "Picatinny rail cutter" or "Picatinny rail form cutter" are more common and more of an official description for such a cutter.

    Pig – Ingot. Usually, term "pig" relates to an ingot from ferrous metals.

    Pinch machining - A general name of machining methods for cutting relatively long and low-rigid parts when a part is simultaneously machined by two opposed cutting tools.
    This method is also referred to as "balanced machining".
    Pinch machining is intended mainly for multitasking machines and comprises pinch turning and pinch milling.

    Plunger – A plunge milling cutter.

    Plunging - Plunge milling.

    Pocketing – Milling pockets and cavities, specifically deep cavities.

    Porky (porcupine) – An extended flute (long-edge) indexable milling cutter

    Port tool, porting tool - A stepped rotary cutting tool for machining a pre-drilled hole to generate a complex inner shape in one operation with axial feed, ensuring required parameters of accuracy and roughness. This tool features high concentricity of stepped cutting edges and is intended mostly for machining hydraulic ports.

    Positive insert – This may relate to two different features of an indexable insert:
    1. Insert where the insert bottom face is smaller than the insert top face.
    2. Inclination of the insert cutting edge that generates a positive axial rake of a tool, when the insert is mounted in the tool.
    This dual meaning sometimes causes serious misunderstandings.

    PH - Precipitation hardening stainless steel.

    Rapid steel - An obsolete name for high-speed steel (HSS).

    Rapid tooling - A general name for shortcuts of tool making, usually connected with additive manufacturing (AM) methods.

    Ribbing - In metal cutting, machining ribs, usually by endmills.

    Rotabroach drill or simply "Rotabroach" – A trepanning cutting tool (an annular cutter). The origin of "Rotabroach" comes from the company Rotabroach Ltd, who started manufacturing and marketing such tools in the 1980’s.

    Round tool - Usually, rotating solid tools.

    Ruthenium, ruthenium grade - A cemented carbide alloyed with ruthenium.

    Sandwich – A sandwich-structured composite material that features a core faced by outer layers.

    Segment mills, circle-segment mills – A general name of profile milling cutters with large-radius cutting edges such as barrel-, lens- and ovel-shape endmills.

    Scalloped edge – A serrated cutting edge.

    Serrated edge – Tool or insert cutting edge with a serrated or wavy shape to ensure chip splitting action that achieves small short segment chips. Serrated cutting edge is also referred to as "scalloped cutting edge" and "knurled cutting edge".

    Shear milling cutter – A milling cutter with negative-positive cutting geometry: negative radial and positive axial rake angles.

    SiMo, SiMo iron – A ferritic ductile (nodular) cast iron, which is alloyed by Silicon and Molybdenum. It features increased resistance to oxidation in high temperatures and therefore used mainly for producing parts of automobile exhaust systems and turbochargers.

    Slicing – Peel milling.

    Slocombe (Slocomb) drill – A center drill.

    Slotter – In milling, this term defines slot milling cutter; however it normally refers to a type of planing machine tool.

    Slotting – Originally, this term defined a machining process where a single-point cutting tool moves linearly and piston wise, and a workpiece is fixed or moves only in linear direction. However, today this term relates more to slot milling.

    Slotting cutter – Slot milling cutter (see above)

    Spanner or wrench - Both words mean the same: a tool, mainly operated by hand, for tightening/untightening parts like bolts, nuts etc. or for preventing a rotational movement of the parts. "Spanner" is more common in UK English and "wrench" in US English.

    Spotting - Spot drilling.

    Staggered tooth mill, staggered mill - A side-and-face disc milling cutter with alternate right- and left-hand teeth.

    Superfinish - This word is often used for the extremely high surface finish that can be achieved by a cutting tool. The tool may even be referred to as a "superfinisher". Not to be confused with superfinishing, which is a fine abrasive machining process!

    Sub edge - A minor cutting edge.

    Surface speed - Cutting speed.

    Surplus – Machining allowance (stock).

    Throwaway tip or throwaway insert - A replaceable or indexable cutting insert.
    On shop floors, this term is rarely used and considered obsolete. However, it continues to be used in the patent practice.

    Thrust, thrust force - An axial cutting force.

    TiNite/Tinite - Titanium Nitride [TiN]. TiNite is a very hard ceramic material that is used in the protective coating of cutting tools.

    Tip-off – in engraving, the width of the flat tip of an engraving tool.

    Titanium beta (β) – In most cases it is a beta-annealed α-β-titanium alloy, although sometimes it means a β-titanium alloy.

    Tombstone – in metalworking, a workholding fixture for machine tools, which has several sides for mounting workpieces to be machined. A tombstone is also referred to as a tooling tower and a pedestal-type fixture.

    Tommy bar - A short rod, which is inserted into a hand tool, such as a socket wrench, for using as a lever when rotating the tool.

    Two-lip endmill – a type of end mill that has center cutting capabilities and can be used as a drill. Two-lip endmills are also known as slot drills.

    V-endmill (V-groove endmill, V-bit etc.) - An endmill (an exchangeable milling head, a bit) with an arrow-headed cutting profile to produce V-shaped slots and grooves.

    Waterfall edge, waterfall, trumpet - An asymmetrically rounded (honed) cutting edge that, when compared with an edge rounded by radius, has an oval-shaped cross-sectional profile. Depending on the profile positioning with reference to the rake and the relief surfaces of a tool, this profile can be "waterfall" and "trumpet" ("reverse waterfall").

    Weldon - The cylindrical shank of a tool (usually a milling cutter) with one or two side flats for clamping and driving. This type of shank was originally introduced by Weldon Tool Co. in the 1920s.

    Whiskers - Whisker-reinforced ceramic.

    Whistle notch - The cylindrical shank of a tool with an inclined side flat for clamping and driving.

    Zigzag chips – Fanfold chips.

    Counterboring and Countersinking
  • What is a zero flute countersink?
    A zero flute countersink is a countersink with a cross through hole that extends through the side of the countersink cone. The intersection of the cone and the hole provides the cutting edge of the countersink. Also referred to as a "cross-hole countersink".
  • Are the cutting speeds for countersinking and drilling equal?
    In countersinking, the cutting speeds are significantly lower when compared to drilling. There is one rule of thumb that is common for machine shop practice: the cutting speed for countersinking is around a third of the cutting speed, recommended for drilling the same material.