NTK Cutting Tools

BACK DUO

Back turning | Swiss CNC Lathes

Reduce cycle time by 1Pass

New chip breaker design allow one pass machining

Possible to reduce cycle time.
Features
  • New chipbreaker covers a wide range of cutting conditions
  • No-compromise quality back turning tools
  • High quality finish in a single pass
  • No finishing cut required (Reduced cycle time)
  • Multi point clamping system ensures rigidity
Tooling application
Swiss CNC lathe back turning
Function range
New 3D chipbreaker

➀ Excellent surface with good chipcontrol
➁ Improved surface finish thanks to wiper flat on cutting edge.

New clamping system

➀ Stable clamping force from three face contact with V-bottom
➁ Utilizes tool pressure to increase clamping force.

Small offset for high precision back turning.
BACK DUO

BACK DUO is able to machine by guide bush for high accuracy back turning.

Conventional
Reduce cycle time by 1Pass
BACK DUO

Excellent surface by 1Pass

Conventional

Conventional machining requires a second finishing cut on the end face.

BACK DUO​
End face
Excellent surface
Diameter
Ra:0.90μm / Rz:4.11μm
Competitor
End face
Rough surface
Diameter
Ra:2.16μm / Rz:10.28μm

Work material:SUS304
Holder:TBDPR12
Insert:TM4 TBDP2201MR
Cutting condition: Vc= 80m/min .260 SFM  (x)= 0.02mm/rev .001 IPR  (z)= 0.08mm/rev .003 IPR  ap= 3.0mm .120 inches  WET

- - - Scroll the table - - -
ISO Work material Grade vc (m/min) (SFM) ap (mm) (inch) f (mm/rev) (IPR)
X Direction Z Direction
Carbon steel
Alloy steel
DM4 40 – 150 130 – 500 0.5 – 3.0 .020 – .120 0.01 – 0.04 .0004 – .0016 0.02 – 0.08 .0008 – .0031
TM4 40 – 90 130 – 300
QM3 40 – 150 130 – 500
Difficult-to-cut
Free-cutting stainless steel
ST4 40 – 150 130 – 500 0.5 – 3.0 .020 – .120 0.01 – 0.04 .0004 – .0016 0.02 – 0.08 .0008 – .0031
DM4 40 – 100 130 – 330
TM4 40 – 90 130 – 300
QM3 30 – 90 100 – 300
HRSA
Co-Cr alloy
DM4 20 – 80 70 – 260 0.5 – 2.0 .020 – .080 0.01 – 0.03 .0004 – .0012 0.02 – 0.08 .0008 – .0031
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