Sumitomo General Catalog 2025-2026

Negative M Class Chipbreakers for Low Carbon and General Steel Turning EFB / EFE

P Steel

· The EFE main breaker for finishing achieves stable chip control over a wide range of feed rates for low carbon steel and general steel. · Item range covers a wide variety of machining applications. · The EFB for low feed finishing increases chip strain and thereby improves chip breaking performance thanks to the variable rake angle in the nose radius.

.075

¢ Application Range

ELU

.060

EFB

B

.045

EFE

.030

EFL

.015

.004

Feed Rate f (IPR) .008 .012 .016 .020

EFE Breaker for Finishing

General purpose to high feed cutting

Performance

Chip Control

Part Material: Pipe material (A36) Insert: CNMG432EFE-AC8025P Cutting Conditions: v c = 656 SFM, f = .0157 IPR, a p = .0079" Dry

Arc-shaped main breaker design achieves stable chip control over a wide range of feed rates

Excellent chip control at low depth of cut, high feed conditions

C

Two-step breaker achieves stable chip control at low feed rates of f =.0039 IPR

Sub breaker for chip control during profiling

D

.055”

.030”

.028”

R

20°

27°

EFE Breaker (AC8025P)

Conventional Tool

EFE Cross Section of Chipbreaker

EFB

Application Examples Part Material: 1053 Steel ø.785-3.935" External Diameter/Facing Insert: DNMG433EFE-AC8025P Cutting Conditions: v c =591 SFM, f =.0098 IPR (Corner), .0177IPR (Straight), a p =.0118", Wet

Application Examples

S

Part Material: Iron plate (1011 Hot Rolled Steel) Facing Insert: CNMG432EFE-AC8025P Cutting Conditions: v c =656 SFM, f =.0059 IPR, a p =.0079-.0197", Wet

Stable chip control even at low depth of cut and variable feed conditions

Breaks chips with a steady curl even in facing of rolled steel

T

100mm

100mm

V

EFE Breaker (AC8025P)

Conventional Tool

EFE Breaker (AC8025P)

Competitor's Product

EFB Breaker for Low Feed Finishing

Low feed cutting

Application Examples

W

Part Material: Pipe material (A36) Internal Diameter Machining Insert: DNMG431EFB-T3000Z Cutting Conditions: v c =1155sfm, f =.0012-.0079 IPR, a p =.0276", Wet

Smooth, high rake breaker joint achieves ultra-low cutting resistance

Small curls of chips even for pipe material, achieving a steady chip length

Variable rake angle in nose radius increases chip strain and improves chip breaking performance

.055”

.030”

EFB Chipbreaker (T3000Z)

Competitor's Product

.028”

20°

27°

EFB Cross Section of Chipbreaker

EFE

B16

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