TURNING INSERTS OVERVIEW

Turning Inserts

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There are many variables that go into choosing the correct insert for your turning operations: insert shape, geometry, grade, and more. The goal is to select an insert that meets your requirements for quality and performance, while providing good chip control, and a reasonable combination of wear resistance and toughness.

Choose the insert style (shape and size) based on the features of the part and the desired depth of cut. A larger nose radius is stronger, but requires more machine power, and increases the tendency for vibration. A smaller nose radius increases the access to fine part features, but has a weaker cutting edge.

Choose the chip breaker (geometry) based on the selected machining operation: finishing, medium, or roughing. Roughing with high depths of cut and feedrates requires an insert with a stronger cutting edge.

Finishing operations with light depths of cut and lower feedrates produce lower cutting forces, so cutting-edge strength is not as important. Medium turning operations, with a wide range of depths of cut and feedrate, require a more versatile geometry.

Choose the insert grade (coatings) based on the type of material being cut, the specific machining operation (finishing, medium, roughing), and the cutting conditions (smooth, lightly interrupted, heavily interrupted). The insert grade and the chip breaker complement each other to provide specific performance characteristics. A tougher grade can compensate for a cutting edge with less strength, while a more wear resistant grade can provide longer tool life on a stronger cutting edge.

INSERT STYLES

Insert Styles

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C-Style Inserts – 80° Rhombic

For external machining and facing. The large point angle is very rigid, and good for rough machining. This is the most commonly used insert.

D-Style Inserts – 55° Rhombic

The smaller point angle of this insert is more versatile for finishing and detail work, but it has less cutting-edge strength than other geometries.

V-Style Inserts – 35° Rhombic

The smaller point angle of this insert is more versatile for finishing and detail work, but it has less cutting-edge strength than other geometries.

T-Style Inserts – 60° Triangle

For internal machining. The 60° cutting angle provides medium cutting-edge strength that allows for both ID roughing and finishing applications.

W-Style Inserts – 80° Trigon

This insert has 3 cutting edges per side. The 80° cutting angle provides high cutting-edge strength for roughing, but the depth of cut is limited by the short cutting edge.

LARGE NOSE ANGLE
• Stronger cutting edge
• Higher cutting forces
• More vibration
• Higher feedrates

SMALL NOSE ANGLE
• Better access to features
• Lower cutting forces
• Weaker cutting edge
• Lower vibrations

Chipbreakers

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HFF

HAL
For cost-effective machining of aluminum, non-ferrous metals, and plastics. Extremely sharp cutting edges result in optimum part finishes with low cutting forces and short chips.

HFP

HFF
For finish turning operations, producing smooth, accurate surfaces. Very good chip control, especially at low depths of cut.

HFS

HFP
For finish to medium turning operations, with optimal chip control over a wide range of cutting conditions and workpiece materials.

HKR

HFS
For finish turning operations. Ground periphery with positive cutting edge ideally suited for high-temp alloys. Micro-finished edge on the ground periphery adds just a slight hone for improved edge integrity and reliability.

HML

HMA
For finish to rough turning operations. Flat-top geometry for machining cast iron.

HMP

HML
For finish to medium turning operations, with a negative, stable cutting edge.

HMR

HMP
For medium to rough turning operations, with reduced cutting forces and improved chip control for high feed rates. Suitable for high metal removal rates and spindling applications.

HMS

HMR
For light to medium rough-turning operations. Excellent choice for steels, difficult-to-machine high-alloy titanium, and aluminum materials. High strength to deal with heavy chip deformation.

HMU

HMS
For medium turning operations. Primarily used with high-temp materials. Utilizes a micro-finished edge preparation to increase edge toughness.

HRH

HMU
For medium turning operations. Medium universal geometry with a soft cutting action due to its positive profile. Versatile application range well suited for boring operations and turning unstable components.

HUF

HRH
For medium to rough turning operations. Outstanding chip control. High edge strength for interrupted cuts, forging skin, or scale. Preferred for all cast iron, such as gray, malleable, and nodular.

HUM

HUF
For finish turning operations, with a positive cutting edge for reduced cutting forces and superior surface quality.

HUR

HUM
For medium turning operations, with a soft-cutting chipbreaker. Used in applications producing varying chip sections, such as profile or copy turning. Good dimensional accuracy. For soft steel materials and stainless steels.

HUR

HUR
For rough turning operations. Improved chip forming and coolant flow for increased tool life. Positive geometry reduces cutting forces and improves depth-of-cut notching resistance. Suitable for stainless steel and smooth machining of steel.

HUR

HM
For medium turning operations. Excellent chip control in various conditions for increased productivity. Variable land reduces cutting loads at high speeds and feeds, promoting stable tool life.

HUR

AL
For finish to medium turning operations. High rake angle and a low resistance cutting edge for extended tool life in continuous cutting of aluminum, non-ferrous metals, and plastics.

HUR

HSF
For finish hard turning operations. Excellent chip control with a unique anti-vibration tip structure. Good dimensional accuracy. Excels at cutting high-hardness materials between 40-62 HRC.

Insert Grades

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Choose the grade that best matches your application and workpiece material.

DECODING HAAS GRADES: HTP15

BRAND

H

Haas

APPLICATION

T

Turning

PRIMARY WORKPIECE MATERIAL

P

  P – Steel

  M – Stainless Steel

  K – Cast Iron

  N – Non-Ferrous

  S – High-Temp Alloys

  H – Hardened Materials

  U – Universal Machining

APPLICATION RANGE

15

10 – Uninterrupted

15 – Light Interrupted

20 – Medium Interrupted

25 – Medium Interrupted

35 – Heavy Interrupted

WEAR RESISTANCE

10

15

20

TOUGHNESS          

25

30

35

SMOOTH
SURFACE

MEDIUM TO
ROUGH SURFACE

ROUGH
SURFACE

Smooth Cut
Pre-Turned

Lightly
Interrupted

Heavily
Interrupted

CLICK + TO EXPAND

CCET Insert Grades

CLAMPING STYLES

Clamping Styles

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M – Multi-Lock System*

• For negative-style inserts
• Lock pin and top clamp provide rigid clamping
• Can use a wide variety of insert styles

P – Lever-Lock System

• For negative-style inserts
• Lock pin and top clamp provide rigid clamping
• Can use a wide variety of insert styles

S – Screw-On System

• For positive-style inserts
• Top clamping by screw for screw-on inserts
• Compact design for reliability
• Does not interfere with chip flow

D – Double-Clamp System

• For negative-style inserts
• Powerful single-lever screw clamping
• Spring design releases clamp automatically
• Optimized for chip flow

M – Multi-Lock System*

• For negative-style inserts
• Eccentric lock pin secures the insert against the side
• Top clamp provides rigid downward clamping
• Can use a wide variety of insert styles

S – Screw-On System

• For positive-style inserts
• Top clamping by screw for screw-on inserts
• Compact design for reliability
• Does not interfere with chip flow

* For multi-lock holders: Rotate the eccentric lock pin counterclockwise until the insert drops on, and then rotate the eccentric pin clockwise to secure the insert against the side of the holder. Install the top clamp to hold down the insert.

Turning Inserts

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