Sandvik Coromant Threading User Manual

Page 84

4. Troubleshooting – Thread milling

Vibration

Re-cutting of chips

• Weak fi xturing

• Tool overhang too long

• Insuffi cient chip evacuation

• Check clamping of workpiece and

tool

• Minimize overhang

• Check tool holder run out

• Choose a tool with fewer teeth

• Increase number of infeed passes

• Increase feed per tooth

• Reduce cutting speed

• Use up-milling in fi nishing

• Use compressed air or large

amounts of cutting fl uid, preferably
through the tool

• Reduce feed per tooth

• Increase number of infeed passes

Problem

Cause

Solution

Notch wear

• Machining work-hardening materials

• Components with skin and scale.

•

Reduce cutting speed

•

Select a tougher grade

•

Increase cutting speed