Sandvik Coromant Threading User Manual

Page 79

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79

4. Troubleshooting – Thread turning

Problem

Cause

Solution

Poor surface fi nish

Poor chip control

Shallow profi le

• Cutting speed too low

• The insert is above the centre height

• Uncontrolled chips

• Re-cutting of chips

• Incorrect method of infeed

• Incorrect thread geometry

• Wrong centre height

• Insert breakage

• Excessive wear

• Increase cutting speed

• Adjust centre height

• Use C-geometry and modifi ed fl ank

infeed

• Use compressed air for evacuation

• For modifi ed fl ank infeed use 3 - 5°

• Use C-geometry with modifi ed fl ank

infeed 1°

•

Adjust centre height

•

Change cutting edge

• Increase radial infeed