Sandvik Coromant Threading - Manual (Page 85)

85
4. Troubleshooting – Thread milling
Machine ineffi ciency
• Machine RPM’s too low • Reduce cutting speed before table
speed
• Use a smaller cutter and make
several infeed passes
• If using CoroMill Plura, change to
CoroMill 327
Problem Cause Solution
Conical threads
• Cutting forces too high • Reduce tool length
• Use conventional milling
• Reduce feed
• Increase number of infeed passes