TBP/TBPA-BMchipbreakerBack turning | Swiss CNC Lathes

Unique chipbreaker provides excellent chip evacuation

Achieves outstanding surface finish in single pass machining

A traditional 2 pass operation can be completed in a single pass while providing chip control.
Dramatically shortens cycle time.

Product video


  • Single pass back turning
  • Up-right insert and screw clamp provides highly rigid system
  • Wiper flat on cutting edge generates superior surface finishes even at high feed rates

Tooling application

Swiss CNC lathe back turning

TBP/TBPA-BM chip control range

Cutting conditions

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Coated grade Material Operation type Cutting speed (m/min) Feed (mm/rev) DOC (mm)
ST4 Stainless Back turning 50 - 120 X direction: 0.01-0.03
Z direction: 0.03 - 0.04

TBP-BM : 0.5-3.5

TBPA-BM : 0.5-5.5

DM4 Difficult-to-cut material / titanium alloy
Alloy steel / carbon steel / hardened material
30 -120 X direction: 0.01-0.03
Z direction: 0.03 - 0.08
TM4 Non-ferrous / aluminum / plastic / general purpose 50 - 180 X direction: 0.01-0.03
Z direction: 0.03 - 0.08

BM chipbreaker

① Prevents the chip from damaging the shoulder feature on the part
② Wiper flat feature generates excellent surface finish

Cutting performance

[ Cutting conditions ]
Material : SUS304 φ16 vc=80m/min f (x)=0.02mm/rev f (z)=0.08mm/rev ap=3.0mm WET
[ Tools used ]
Holder : TBPR12  Insert : TM4 TBP72FR10M-BM

Case study

Material :
Cutting speed :
50 m/min
Feed :
0.05 mm/rev
2.0 mm

①1 pass machining * no extra operations required

Competitor’s product

①Roughing - grooving operations
②Finishing - back turn operation

The current process required 2 steps to complete the part feature.
NTK's BM chipbreaker achieved shortened cycle time with a single pass operation .
High quality finish on the OD and shoulder due to the chipbreaker design which evacuates chips away from the part

Tool lineup

View Catalog Information

Please check product catalog for tooling lineup