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Frequently Asked Questions


What are the strengths of Tungaloy

Since its establishment in 1929, Tungaloy has been successfully developing and marketing superior grades for machining all types of materials, including CBN, Cermet, PCD, Ceramics and fine carbide grades with CVD and PVD coatings. Tungaloy is one of 4th largest CBN producer in the world.

What is a carbide grade?

A combination of cemented carbide, coating and post coating treatment produces a carbide grade. Only one of these components, the cemented carbide, is the necessary element of the grade, the others are optional. Cemented carbide is a composite material, comprising hard carbide particles that are cemented by a binding metal (usually cobalt).

A majority of cemented carbide inserts commercially available today are coated by a wear resistant coating, known as “coated cemented carbides”. There are also various surface treatment processes that may be applied to the rake face of the cemented carbide after the coating process. “Cemented carbide” may refer to both the substrate of a coated grade and an uncoated grade.

What is PremiumTec technology?

PremiumTec refers to a specific post-coating treatment process developed by Tungaloy. This surface treatment technology enhances the uniformity of the coated surfaces, while eliminating the by-products created during the coating process, which negatively affect the insert performance and shortens insert life. PremiumTec removes the inner tensile stresses created in the CVD coating due to the difference in thermal expansion coefficients between the substrate and coating layer. Droplets generated on the PVD coated insert surface can also be removed.

Application of PremiumTec, post surface treatment technologies considerably eliminates these unwanted defects, while increasing tool life and productivity.

Why are PVD nano layered coatings considered so efficient and progressive?

PVD coatings were introduced during the late 1980s. With the use of advanced nano-technology, PVD coatings performed a gigantic step in overcoming complex problems that were impeding progress in the field.

Developments in science and technology brought a new class of wear-resistant nano layered coatings. These coatings are a combination of layers having a thickness of up to 50 nm (nanometers) and demonstrate significant increases in the strength of the coating compared to conventional methods.


What is Tungaloy’s first grade choice for steel machining?

Our premium grade for steel is Tungaloy’s CVD coated grade, T9215 for Accelerated Machining (high speed & high feed).

What is Tungaloy’s first choice in chip formers for steel machining?

Tungaloy offers the T series chipbreakers (-TF, -TSF, -TM and -TH) for finishing, semi-finishing, medium and rough turning of steel. And the P series chipbreakers (-PF, -PSF and -PM) on our positive inserts for finishing, semi-finishing and medium turning for steel.

These chipbreakers, combined with Tungaloy’s PremiumTec treatment technology, delivers higher productivity, longer tool life, improved workpiece quality and more reliable performance. The chipbreakers generate less heat and prevent chips from welding on the cutting tools and components. Chips are broken down into smaller pieces to prevent them from tangling around the workpiece, facilitating more efficient removal from conveyor belts.

How do I improve surface roughness?

Cermet grades, such as NS9530 and GT9530 are some of the solutions for mirror-finish surface on steel.

What is Tungaloy's recommendation for cost saving?

In many turning applications, machinists tend to use inserts that are larger than actually required for the machining parameters being applied.
Tungaloy presents ISO-EcoTurn, the small sized insert series, which provide an economical advantage regarding cost per cutting edge.
Reduces about 40% in volume of insert and 20% in cost without reducing cutting conditions.

How do I select the anvil's handedness for internal turning holders?

Select a Right hand anvil for a Right hand toolholder and a Left hand anvil for a Left hand toolholder.

What grades and chip breakers does Tungaloy offer in ISO-EcoTurn line?

Absolutely all popular grades, chipbreakers and geometries are available in the ISO-EcoTurn line.

How do I improve chip control with a CBN insert?

CBN inserts are mainly used for machining hard materials in a hardness range from 55 to 62 RC. Conventional CBN inserts offer a wide range of brazed and flat tips that produce long and curled chips during the machining of hardened steel. Long chips can scratch the workpiece and damage the surface quality. Tungaloy offers a range of T-CBN inserts with chipbreakers that are ground on the CBN cutting edge to provide excellent chip control in medium to finishing applications with high surface quality. Tungaloy also offers Wiper technology on T-CBN inserts, which provides a superior surface roughness at a higher feed rate.

I am using a boring bar with a long overhang of more than 4xD. How do I reduce vibration?

Please use StreamJetBar, carbide type boring bars. StreamJetBar reduces chattering and improves chip control in boring with a high overhang. BoreMeister, a boring bar with an anti-chatter mechanism, is also available.

What is the advantage of Premium CVD grades?

The main advantage of premium CVD grades is the ability to work two to three times faster in cutting speed, from 100 m/min (330SFM) and up to 300 m/min (980SFM) , which is three times higher than any conventional carbide inserts. This dramatically increases productivity.

What is Tungaloy’s first choice chipbreaker for stainless steel?

Tungaloy offers 3 new chipbreakers: -SF for finishing, -SM for medium and -SH for rough turning of stainless steel. All of which, together with the most advanced PremiumTec treatment technology, provide higher productivity, tool life and performance reliability. All 3 chipbreakers are also available in the ISO-EcoTurn line.

In addition, Tungaloy’s new chipbreakers: -HRF for finishing and -HRM for medium turning difficult-to-cut alloys, together with AlTiN PVD premium grades, provide Accelerated Machining at a high speed and feed.

What is the benefit of high-pressure coolant?

The main advantages of high pressure coolant is the ability to improve chip control, reduce heat and extend insert life. Tungaloy’s TungTurn-Jet tool system is designed to supply the coolant directly into the cutting zone significantly maximizing productivity.

The high pressure coolant tooling is effective in machining sticky, gummy materials such as super alloys, stainless steel, titanium, and more.

Where can I find CAD drawings of the tools?

Go to the e-Catalog page on Tungaloy’s website. Search the tool description code to find the CAD data (.dxf or .stp) for download.

What are the guidelines for the length-to-diameter ratios for internal turning holders?

The maximum LxD ratio for a steel shank is 3x, for a carbide shank it is 5x, and for BoreMeister, a boring bar with an anti-chatter mechanism, it is 10x.

What torques are recommended for the insert screws of internal turning holders?

See our latest General Catalog for recommended torques for all screw sizes.


What product does Tungaloy offer for general grooving applications?

Tungaloy offers several options for general grooving applications: the TungCut and TetraForce-Cut series offer a wide variety of grooving inserts for various widths and depths. The TetraMiniCut series is an economical solution for small widths and depths grooving close to the shoulder.

What is the best solution for face grooving?

EasyMulti-Cut is the most efficient tool for deep face grooving operations offering improved productivity, excellent chip control and evacuation with adjustable blade system.

What is the best economical solution for grooving and parting?

TetraForce-Cut and TetraMini-Cut are the most economical solutions which uses inserts with 4 cutting edges. Ground insert clamps into unique insert pocket and provides high rigidity as well as repeatability and economy.

What is the first choice for heavy duty grooving?

For heavy duty grooving applications use Tungaloy’s TungHeavyGroove which features a unique dovetail structure to prevent insert movement during operations. Inserts are available in a width range of 10 – 25 mm (0.394″- 0.984″).

What grades are recommended for ISO-M and ISO-P materials?

The first choice grade is AH7025, effective for a variety of applications. If you need good wear resistance in turning and grooving, use T9125. If you need a tougher grade with more impact resistance (Interrupted cuts), use GH130.

What is the most suitable grade to machine ISO-S (high temperature alloys) materials?

Use AH905 to machine high temperature alloys.

Which grooving toolholders should I use on Swiss-type machines?

Use our secure clamping system “DuoJust-Cut”, which provides both front and back access to the insert screw, facilitating easier tool preparations in Swiss-type machines (as opposed to the conventional top clamping).

What tools/inserts should I use for internal grooving in small diameter bores?

For bore diameters: 2 – 10 mm, use TinyMini-Turn inserts and toolholders.

What is the advantage of TinyMini-Turn line versus competitors?

TinyMini-Turn offers coolant through supply and precision cutting edges with a chip breaker for high productivity and surface quality.

How can I reduce vibration?

Use the minimum possible overhang.
Work with a constant RPM.
Reduce the RPM if needed.
Reduce the insert width in order to decrease the cutting force.

When do you recommend using TungTurn-Jet tools with internal coolant?

TungTurn-Jet and Direct-TungJet tools are recommended for all coolant pressure levels 10 – 340 Bar (145 psi to 4930 psi) and all applications, as they deliver a repetitive and reliable coolant supply directly to the cutting edge at the exact point where it is needed, improving tool life and chip control. In addition, DirectJet does not require any extra coolant subassembly.

How can we reduce the tooling cost?

You can use TungModular system which can use same shanks of toolholders for different blades and inserts .

Threading (Milling)

What is thread milling?

Thread milling produces threads with the circular ramping movement of a rotating tool.
The lateral movement of the tool in one revolution creates the thread pitch.

What types of ThreadMilling tools does Tungaloy offer?

Tungaloy offers indexable ThreadMilling tools in multi-tooth design for high productivity, single-tooth for deep holes, and also solid carbide tools.

What are the advantages of ThreadMilling versus taps?

Interrupted cuts offer good chip control in long-chipping materials.
Lower cutting forces make it possible to thread in long overhangs and thin-walled components.
There is a risk of tap breakage on expensive parts; a thread mill can always be removed from the component completely.

How I can choose the right tool for the right application and thread?

You can use our ThreadMilling advisor program which is available on our website.

Who can help me prepare a program for ThreadMilling?

You can use our ThreadMilling advisor program which is available on our website.

Threading (Turning)

What is the difference between partial and full profile?

Partial profile inserts do not cut the minor diameter (do not make calibration) while full profile inserts cut the minor diameter.

What is the advantage of the full profile insert?

Performs complete thread profiling.
Recommended for mass production.

What is the disadvantage of the full profile insert?

Suitable for a single profile only.
Root corner radius is only suitable for the relevant pitch.

What is the advantage of the partial profile insert?

One insert covers a wide range of pitches.

What is the disadvantage of the partial profile insert?

The partial profile insert has a smaller nose radius compared to the full profile inserts. This results in a weaker thread and a shorter tool life.
Additional operations to complete the outer/internal diameter is necessary.
Not recommended for mass production.

What is the recommended infeed method?

Flank infeed has better chip control and surface finish in most raw materials and applications.

How to select the correct anvil?

Anvils for positive inclination angle are applicable when turning RH thread with RH holders or LH thread with LH tool holders.
Anvils for negative inclination are used when turning RH thread with LH holder or LH thread with RH tool holder.
Use AE Anvils for EX-RH and IN-LH Tool holders.
Use Al Anvils for IN-RH and EX-LH Tool holders.

Is it possible to produce multi-start threads with standard inserts?

Yes, it is possible. Remember: Lead = Pitch Multiplied by the No. of Starts.

What is the most suitable grade for threading stainless steel?


What is the most suitable grade for low-powered, unstable machines?


Why is the chipbreaker not working?

When the depth of cut is too small, the chipbreaker becomes ineffective. Find the appropriate DOC in Tungaloy’s catalog for the insert currently in use and apply.

What can I do to improve the chip control?

Select the correct infeed type:
Radial infeed
Flank infeed
Alternating flank infeed

What threading toolholders should I use on Swiss-type machines?

TetraMini-Cut or DuoJust-Cut can thread the workpiece all the way closest to the flange wall without any interference.

What is the maximum length-to-diameter ratios for internal threading holders?

The maximum LxD ratio for a steel shank is 2x, for a carbide reinforced steel shank (or “Tsuppari-ichibantype”) and carbide shank it is 3x.

Is it possible to produce Left hand thread with Right hand toolholder and insert?

Yes, it is possible by changing the anvil and infeed method.


Which product families are included in the TungForce indexable milling line for accelerated machining?

DoTwistBall, TungForce-Rec, Tung-Tri, DoForce-Rec, DoTriple-Mill are our major product families for Accelerated Machining.

The term “high positive” is often used when speaking about indexable milling cutters. What does it mean?

Generally, this term relates to the rake angles of an indexable milling cutter. Engineering ingenuity and advancement in powder metallurgy have resulted in the production of helical cutting edge inserts with a rake face that is “aggressively” inclined with respect to the insert cutting edge. This causes a significant increase in the positive rake angles (normal and axial) of a cutter carrying the inserts. The term “high positive” emphasizes this feature. Note: This definition reflects current, state of the art processes. As the production of tools with cemented carbide inserts does not deplete its own resources, we may assume that “high positive” of today will be considered as “normal” tomorrow.

Cemented carbide is a main material used to produce indexable inserts. Tungaloy provides a rich variety of carbide grades. Where can I find basic information on properties of the grades, recommended cutting speeds, and application ranges?

Tungaloy offers electronic and printed catalogues that contain a description of the grade constituents (substrate and coating types), the range of cutting speeds and application ranges in accordance with ISO standards. Contact Tungaloy representatives in your region for details and assistance.

Do the indexable milling cutters have internal channels for coolant supply?

Most of the TungForce milling cutters introduced recently feature an inner channel for coolant supply to each insert directly through the cutter body.

Which is better to improve productivity – varying the feed or the depth of cut within acceptable limits?

It should be noted that the question has no definite answer and depends on several factors. However, in general, under the same MRR, increasing the feed coupled with reduced depth of cut is more favorable than the opposite combination (lesser feed with deeper cut) because this typically provides greater tool life.

How can I find a more efficient indexable milling cutter for my application?

If you know the application parameters, Tungaloy’s Tung-Navi , a computer aided search engine, can be a very effective tool. This free software can be accessed online or by downloading the Dr. Carbide App to any handheld device. If you require futher assistance with your tooling selection please contact a Tungaloy representative.


Mobile App – Dr. Carbide: Google Play, App Store

I am face milling stainless steel and experiencing severe chip welding and poor surface finish. What do you recommend to improve the situation?

Use water soluble cutting fluid and decrease the cutting speed by 20%.

How do I calculate the tool's RPM and feed rate from the recommended cutting parameters?

n = (Vc x 1000)/(3.14 x D), Vf = fz x Z x n,
For imperial stds:
n=SFM x 3.28 / D, Vf=Fz x Z x n.

Milling (High-Feed Milling)

Does Tungaloy provide indexable milling cutters for High Feed machining?

Yes, ever since its first launch back in 1990, Tungaloy has successfully brought to market a wide variety of indexable milling cutters for High Feed applications. Our most popular indexable products for High Feed milling include DoFeed, DoFeedQuad, MillQuadFeed, MillFeed, as well as TungMeister tools and solid carbide end mills.

Which milling operations are most effective for applying High Feed machining?

The most effective applications for High Feed machining are rough milling planes, pockets and cavities.
Although the depth of cut is limited to less than 2.5 mm, the extreme feed makes it a highly productive milling method.

Does Tungaloy have High Feed solutions for face milling?

Yes, DoFeedQuad and MillQuadFeed are ideal solutions for medium to heavy face milling of steel, cast iron, stainless steel, and heat resistant alloy.

Which High Feed lines have the ability to perform circular ramping operations?

DoFeed, MillFeed, MillQuadFeed

Does Tungaloy have High Feed solutions for machining difficult-to-cut materials like titanium or high temperature alloys?

Yes :
– MillQuadFeed has helical cutting edge inserts with a rake face that is “aggressively” inclined with respect to the insert cutting edge. Cutters have excellent chip flow thanks to the large gullets .
– DoFeed has been the go to product in many Aerospace companies for smaller diameters.

Milling (Slot Milling)

What products does Tungaloy offer for Slot Milling?

Tungaloy offers innovative and economical solutions for Slot Milling under the SlotMill Series :
TungMini-Slit – Slotting cutter ideal for thin slitting as well as cutting off.
TungThin-Slit, TungUniversal-Slot – Economical insert with 6 cutting corners.
TecTangential-Slot – Robust, tangential, 4 cutting edged insert.

What is the application range of Slot Milling?

Tungaloy’s SlotMill series covers widths from 1.6mm (0.063”) up to 25mm (1.00”) in standard tools and inserts.

What are the main types of Slot Milling cutter bodies?

The Slot Milling cutters differ in their mounting methods. They have either an arbor hole or shank type configuration.

Why are Slot Milling cutters called side and face milling cutters?

SlotMill cutters have teeth on its face and periphery, and features a cutting face and sides for the simultaneous machining of the three surfaces: the bottom and the two sidewalls of the slot.
Side and face milling cutters can handle long, deep, open slots in a more efficient manner, and provide the best stability and productivity for this type of milling.

Which method is a first choice for Slot Milling?

Down-milling. Make sure to use a firm stop in the direction of the tangential cutting forces to prevent them from forcing the workpiece down against the table.
The feed direction corresponds with the cutting forces, which means that rigidity and eliminating backlash are also important, since the cutter has a tendency to climb.

Milling (TungMeister)

What are the advantages of TungMeister?

One TungMeister shank can carry heads with different profiles. These exchangeable heads drastically reduce tool change time.
TungMeister is a high-tech substitute for HSS and solid carbide milling cutters, ensures a reduction in tool disposal and allows for flexible combinations for various application needs.

How is a head mounted into a shank?

The exchangeable head is simply screwed onto the dedicated shank.
During mounting, the head is screwed in by hand and then tightened with a wrench.
The head has two contact surfaces, which determine the heads location in the shank. The tapered surface ensures high concentricity, while the flange face surface secures the heads radial accuracy.

What type of TungMeister heads does Tungaloy offer?

Tungaloy offers a wide range of TungMeister heads:
End milling heads of various shapes – 90°, 45°, 60° and more.
Profile milling heads, ball nose, toroidal, concave radii and others.
Heads for high-feed milling;
Slot and groove milling heads for milling grooves for retaining or O-rings, T-slot and more.
Thread milling heads; and
Center and spot drilling heads.

What is the accuracy of the heads?

The accuracy of the end mill heads have the following tolerance limits: e8 tolerance for multi flute heads that are produced from blanks and h9 tolerance for economy type heads.
The precision 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.

Is it necessary to lubricate threads when mounting the heads into a shank?

No , do not apply lubricants to the TungMeister S-thread connection.

What is the repeatability tolerance of TungMeister heads?

One of the main advantages of the face contact is high repeatability, which ensures a close tolerance for the head overhang with respect to the contact face of a shank. The overhang limits are ±0.02 mm (0.0008″ ) for the majority of the end milling heads.

Milling (Face Milling)

What is face milling?

Face milling is the most common milling operation and can be performed using a wide range of different tools.

Which method is a first choice for face milling?

Cutters with a 45º entering angle are most frequently used, but round insert cutters, feed mill cutters, square shoulder cutters and side and face mills are also used for certain conditions.

What is the advantage of 45º cutters?

Reduce vibrations on long overhangs due equal distribution of cutting forces in vertical and Horizontal directions.
Chip thinning effect allows increased productivity.

What are the target applications of 90º cutters?

Thin walled components
Weak-fixtured components.
Milling close to a fixture to avoid interference.
Where 90° form is required.

What is the advantage of round and feed insert cutters?

– Strongest cutting edge.
– Especially suitable for heat-resistant alloys.
– Smooth cutting action.

What products does Tungaloy offer for face milling?

DoOcto / DoQuad

How can we improve surface quality?

Excellent surface finishes can be achieved with standard inserts in combination with one or more wiper inserts. Wiper inserts work most efficiently at a high feed per revolution, in larger diameter cutters with extra close pitch and adjustable mechanism.

Does Tungaloy have wiper inserts?

Yes, all our main lines have wiper inserts for better surface quality.

Does Tungaloy have milling cutters dedicated for finishing operations?

Tungaloy offers the NMS cutter range for finishing operations. This cutter is capable of providing a sub-micron quality of surface finish so that it can even make an excellent replacement for some of the grinding operations.

Milling (Shoulder Milling)

What is shoulder milling?

During shoulder milling operations, the cutter generates two faces simultaneously, which requires peripheral milling in combination with face milling.

What is one of the most important conditions when shoulder milling?

Achieving a true, 90º degree shoulder is one of the most important requirements.

Which Tungaloy product line is the first choice for shoulder milling?

The Tung-Tri line with economical, super positive, triangular Inserts with 3 cutting edges for 90° shouldering.

What is the most economical solution for 90° shouldering?

DoForceTri shoulder milling cutters with double-sided triangular inserts with 6 cutting edges.

Does Tungaloy have an extended flute line for heavy rough shouldering?

Yes :
– TungTriShred line with triangular shred inserts with 3 cutting edges
– DoRec line with tough, double sided inserts with 4 edges
– TecMill line with tangential clamped insert with 4 edges
– TungRec and TungQuad lines for smaller diameters with 2 and 4 cutting edge respectively

What is Tungaloy's line-up of shoulder milling cutters?

Tungaloy produces all types of cutters; bore type, shank type, extended flute, modular, solid carbide and multi-functional.

Does Tungaloy have a powerful, indexable solution for small MC and lathe machines?

Yes, TungForce-Rec provides outstanding cutting performance, exceeding the ability of solid carbide endmills in machining small pockets and slots.

How can deeper shoulders be produced?

Tungaloy’s first choice is the Tung-Tri line with a super positive rake face design for low cutting resistance plus helical cutting edges for smooth cutting and excellent wall straightness.
For more deeper shouldering use extended flute, and see extended flute section in FAQ.

Milling (Extended Flute)

What is an “extended flute” cutter?

Extended flute cutters are also known as “porcupine” or “long-edge” cutters, also called COB cutters.
The cutting length of an extended flute cutter consists of a set of indexable inserts that are placed gradually with a mutual offset of one another.

Which milling operation is more effective for Extended flute cutters?

Extended flute cutters are generally used for milling deeper shoulders and trimming operations.
Tungaloy’s extended flute cutters are suitable for cost-effective machining.

How can power consumption be reduced?

Tungaloy’s extended flute mills use splitter inserts to improve performance during roughing operations and reduce power consumption.

Does Tungaloy have an extended flute line for heavy rough milling?

Yes. The TungTri-Shred line uses triangular shred inserts with 3 symmetrical cutting edges.
Wave shredded cutting edge splits the chips, reduces vibration and cutting forces in heavy machining.

Can extended flute cutters be used for semi-finish operations?

Yes. There are solutions that ensure this type of machining.
TungTri’s economical 3 cutting edged wiper inserts with helical cutting edges are well-balanced, designed especially for semi-finish milling.
The TungTri-Shred line uses inserts with a straight, high positive cutting edge for finishing and semi-finishing applications.
Tungaloy’s TecMill line for roughing with tangential clamped insert with 4 edges.

Does Tungaloy have an economical solution for extended flute cutters?

Yes, a modular extended flute cutter in the Tung-Tri line offers a smart connection for milling length flexibility.

What grades are available in the extended flute lines?

The various cutting tool material grades and geometries available allow the tools to be optimally matched to the respective application.
AH3135 for steel and stainless steel
AH120 and T1215 for cast iron
KS05F for non ferrous materials

Milling (Profile Milling)

What is profile milling?

Profile milling is multi-axis milling of convex and concave shapes in two and three dimensions.

Which industries use profile milling operations the most?

The primary industry using profile milling is Die and Mold followed by the Aerospace industry. In addition, almost every industry requires profile milling tools in a varying degree.

What is the most common geometry for profile milling?

Round indexable inserts and ball nose end mills in solid carbide tools or indexable type tools.

What are the critical points and recommendations when profile milling?

When using a ball nose end mill, the most critical area of the cutting edge is the tool center, where the cutting speed is close to zero, which is unfavorable for the cutting process.
Chip evacuation at the tool center is critical, due to the narrow space at the chisel edge.
We recommend tilting the spindle or the workpiece 10 to 15 degrees, which moves the cutting zone away from the tool center.

What is the advantage of point milling – tilted cutter?

The minimum cutting speed will be higher.
Improved tool life and chip formation.
Better surface finish.

What can be used as an alternative to round indexable inserts?

Tungaloy’s DoTwistBall line with twisted, high positive angled inserts which fit into a unique pocket shape ensuring high stability and accuracy of insert positioning.
An additional advantage is the 120º edge which allows ramp down operations on all 4 cutting edges.

What products does Tungaloy offer for profile milling?

– DoTwistBall
– BallFinishNose
– DoMini-Mill
– FixRMill
– RoundSplit
– Solid Carbide Ball Nose Endmills
– TungMeister ball nose heads

Milling (Gear Milling)

Does Tungaloy provide tools for milling gears and splines?

Yes, Tungaloy has been producing gear milling solutions for many years.

What is the application range of Slot Milling?

Tungaloy’s SlotMill series covers widths from 1.6 mm up to 25 mm in standard tools and inserts.

What are the available module ranges for gear milling cutters?

The module ranges available for gear milling cutters are

Internal External
Roughing M10 – M32 M6.5 – M60
Finishing M5 – M25 M5 – M20

What is the accuracy for finishing?

Our finishing cutter can guarantee “CLASS 7~8 DIN” (ANSI 1-2) accuracy.

Hole Making

What is the standard lineup of Tungaloy's drilling line?

– Solid carbide small diameter drills from 0.1mm up to 3 mm (0.004″ up to 0.118″); L/D = 5-15
– Solid carbide drills with and without coolant from 3 mm up to 20 mm (0.118″ up to 0.781″); L/D=2-8
– Drillmeister – indexable head drill from D6 mm up to 25.9 mm (0.236″ up to 1.020″) ; L/D = 5 -10
– TungDrillTwisted indexable insert drills from 12.5 mm up to 54 mm (0.5″ up to 2.125″); L/D = 2 – 5
– TungSixDrill indexable insert drills from 20 mm up to 54 mm (0.812″ up to 2.00″); L/D = 2 – 4
– TungDrillBig series, Body, L/D=2.5, dia=55 – 80mm (2.25″ up to 3.157″), diameter adjustable with setting plates. The same inserts can be used for TungDrillTwisted and TungSixDrill.

What is the recommended coolant flow rate?

This depends on the diameter. For example, the minimal flow rate for a 6 mm (0.236″) DrillMeister is 5 liters per minute (1.32GPM); for a 20 mm (0.787″) use 18 liters per minute (4.75GPM)

What is the recommended coolant pressure?

This depends on the diameter and tool length. For example, the minimal pressure for a 6 mm (0.236″) DrillMeister on 8xD is 12 bar (174psi); for 25 mm (1.00″) DrillMeister on 12xD is 4.5 bar (65 psi)

What straightness can be achieved with DrillMeister?

With a stable set-up, the deviation may vary from 0.03 (0.001″) mm to 0.2 mm (0.008″) for each 100 mm (4″) of drilling depth. Important: Achieved results may vary due to tool length, machine, fixture, adaptation, etc.

Is it possible to use DrillMeister for boring operations?

No, the DrillMeister family is not designed for boring operations. The tool and insert may fail.

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 the HYDRO type.

What should the maximum hole exit be for DrillMeister?

The exit for the materials should not be more than 2-3 mm (0.08 – 0.118″) than the diameter edge of the insert.

Is a pilot hole always needed before drilling?

Normally it is not necessary. Pre-drill a pilot hole only when the length-to-diameter ratio is 8 or above.

I am using an indexable drill in an external coolant setup. Do I need to lower the cutting parameters?

Yes. In this case, the maximum drilling depth will be 3xD. Lower the feed rate by 20%.

Can an indexable insert drill be used to enlarge a pilot hole?

It is possible, only if the pilot hole is smaller than 1/4 of the final working diameter.

What is the best economical solution for drilling?

TungSix-Drill is the world’s leading indexable drill with 6 cutting edges.

What are the advantages of TungSix-Drill versus traditional indexable drills?

Stronger central cutting edge due the obtuse angle relief
Economical 6 cornered drilling inserts for cost reduction
Stable cutting even with highly interrupted machining

Can we use TungSix-Drill for machining stainless steel or low carbon steel?

Yes, TungSix-Drill provides a similar chip shape compared to positive type inserts due to its higher rake angles.
Use DS chip breaker for stainless and low carbon steel.

Does Tungaloy have an indexable solution for deep hole drilling?

Yes, DeepTri-Drill is a high productivity, indexable deep drilling line.

What is the standard range of the GunDrill lineup?

Standard gundrill sizes are for drilling depths: 10xD, 15xD, and 25xD. A longer gundrill up to 2.5 meters or 8 feet is also available on request.

What is the benefit of DeepTri-Drill inserts?

Unique triangular insert with splitters. Splitting the chips is essential for chip evacuation suitable for most workpiece materials.

What is the accuracy of DeepTri-Drill and how is it reached?

An accurate diameter of IT10 is assured throughout the hole due to 2 guiding pads, which also assures high straightness and excellent surface finish.

Can we use DeepTri-Drill inserts and pads for BTA heads?

Yes, all types of DeepTri-Drill inserts and some pads can also be mounted on BTA heads and gundrills.

I want to use a gun drill on a lathe. Is this possible provided the coolant pressure is increased?

Yes, but check Tungaloy’s General Catalog for the recommended coolant pressure and amount.

Contact Form

    Tungaloy Ibérica S.L.
    C/Miquel Servet, 43B, Nau 7, Pol. Ind. Bufalvent ES-08243 Manresa, Barcelona, Spain
    Phone: +34-93-113-13-60
    Fax: +34-93-876-27-98