Sandvik Coromant Threading - Manual (Page 81)

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4. Troubleshooting – Thread milling
Chipping
• The part of the cutting edge which is
not in cut is damaged by chip ham-
mering, leading to poor surface and
excessive fl ank wear
• Increase cutting speed
• Reduce feed at the beginning of the
cut
• Improve stability
• Increase number of infeed passes
• Use a full-profi le insert
Problem Cause Solution
Thread milling
Poor surface fi nish and cutting edge
frittering when the built-up edge is torn
away.
• Cutting zone temperature is too low.
• Very sticky material, such as low-
carbon steel, stainless steels, and
aluminium.
Built-up edge (B.U.E)
• Increase cutting speed or feed
• Use oil mist or cutting fl uid