Sandvik Coromant Threading - Manual (Page 79)

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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