Sandvik Coromant Threading - Manual (Page 84)

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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