THE ACT EFFECT: WALTER Tools T271 Threadmill

Friday, February 23, 2018

The Tool
The T271 family is designed for 2 x Dn thread lengths, with an additional neck in order to bridge interference contours. The universal indexible insert threading milling cutter from Walter Tools is manufactured for high cutting rates along with high feeds per tooth. With adjustable coolant supply, the T271 has radial and axial coolant outlets.

The Application
The T271 tool can be used universally with ISO P,M,K,S and H up to 55 HRC. It is designed for threads with a nominal diameter from 24mm, with a pitch range of 1.5mm/18-4 TPI, threading a depth of up to 2.5 x Dn.

The Insert
The wear resistant universal grade WSM375 has easy cutting geometry with a positive basic shape with three cutting edges. Defined with a corner radii the inserts produces threads in accordance with various standards.

The Strategy
It is recommended that the thread be produced with a radial cut using synchronous milling. The programming radius can be determined using Walter GPS. Non cutting passes can be carried out without radius corrections.

Case Studies
Hydraulic manifold M42 x 51mm deep, blind hole Material : Austenitic Duplex


Competitor Walter Tools Solution
Exchangeable carbide head Z3 x 1 row T2711-W35-032-03-11-3-27
Cycle time per thread = 4 mins Indexable insert Z3 x 3 rows (2 rows in use)
Tool wear high, last threads require re-machining Vc = 80 m/min, Fz = 0.20mm
Cut time per thread 1min,26s
All threads completed without offset correction
Time Saving per Thread 65%

Valve body pad holes 1-1/2 x 8 UN, blind hole
Materail: F55 Super Duplex

Competitor
Walter Tools Solution
Exchangeable carbide head Z6 x 1 row
T2711-W31-032-03-09-25.4
Vc = 71 m/min, Fz = 0.053mm
Indexable insert Z3 x 3 rows (2 rows in use)
Cut length = Full thread length 48mm
Vc = 70 m/min, Fz = 0.20mm
2 passes per thread, spring pass required.
Cut length = 8 TPI, 26mm
Cut time per thread 5m,30s x 2 = 11mins.
1 pass per thread, no spring pass needed
Cut time per thread 2min,30s
Time Saving per Thread 77%


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