Sumitomo General Catalog 2025-2026

Positive M Class Chipbreakers for Low-carbon and General Steel Turning EFB / ELB

P Steel

· The EFB for nishing and the ELB for light cutting have been added to the chipbreaker series for low carbon and general steel machining in addition to the existing ELU for nishing and ESU for light cutting. · The EFB and ELB chipbreakers improve chip control in nishing of low carbon and general steel.

 Application Range

.12

ESU

.08

ELB

B

.04

EFB

ELU

0

.004

.008

.012

Feed Rate f (IPR)

EFB Breaker for Finishing

ELB Breaker for Light Cutting

Strengthened edge reduces unexpected breakage

Ridge reduces edge breakage

C

High rake breaker wall improves chip breaking performance

Special breaker ridge shape achieves stable chip control

D

.030”

.020”

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

15°

20°

R

Cross Section of Chipbreaker

Cross Section of Chipbreaker

Performance

Performance

S

Chip Control

Chip Control (1)

Part Material: Pipe material (A36) ø1.18” Internal Diameter Machining Insert: TPMT221EFB-T1500A Cutting Conditions: v c = 328 SFM, f = .0047 IPR, a p = .0039” Wet

Part Material: Pipe material (A36) ø1.18” Internal Diameter Machining Insert: TPMT221ELB-T1500A Cutting Conditions: v c = 656 SFM, f = .0059 IPR, a p = .0197” Wet

T

Achieves stable chip control at shallow depths of cut and low feeds

Achieves stable chip control in light cutting

V

50mm

50mm

W

EFB Chipbreaker (T1500A)

Competitor's Product

ELB Chipbreaker (T1500A)

Competitor's Product

Comparison of Surface Roughness of Finished Surfaces

Chip Control (2)

Part Material: Pipe material (A36) ø3.93” Internal Diameter Machining Insert: TPMT221EFB-T1500A Cutting Conditions: v c = 656 SFM, f = .0028 IPR, a p = .0039” Wet

Part Material: Hub (1045 Steel) Insert: VBMT332ELB-T1500A Cutting Conditions: v c =787 SFM, f =0.010 to .011 IPR, a p =.0236”, Wet

ELB Chipbreaker (T1500A)

3.93”

Competitor's Product

100μm

100μm

Doubles the tool life by improving chip control and reducing blemishes on machined surfaces

3.93”

EFB Chipbreaker (T1500A)

Competitor's Product

B17

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