Page 150 - Threading_Handbook

2.16 Troubleshooting
THREAD TURNING Problem • Excessive heat in • Reduce RPM/reduce depth

Solution
Cause

of cut/check turned dia.
cutting zone
• Use coated grade/use harder grade
• Wrong Grade
• Apply coolant
• Inadequate coolant supply
• Reduce depth of cut /increase no. of passes
• Depth of cut too large
• Cutting speed too high
• If possible use insert with larger radius
• Nose radius too small
Plastic Deformation
• Cutting speed too high • Reduce cutting speed
• Reduce RPM
• Infeed depth too small • Modify flank infeed /increase depth of cut
• Highly abrasive material • Use coated grade
• Inadequate coolant supply • Apply coolant
• Wrong inclination anvil • Reselect anvil
• Wrong turned dia. prior • Check turned dia.
to threading • Check center height
• Insert is above center line
Premature Wear
• Wrong turned dia. • Check turned dia.
prior to threading • Use tougher grade
• Wrong Grade • Change to M/B-Type inserts and
• Poor chip control use modified flank infeed
• Incorrect center height • Check center height

Insert Breakage

• Cutting edge too cold • Increase RPM /increase depth of cut
• Wrong grade • Use coated grade
• Inadequate coolant supply • Apply coolant
• Incorrect cutting speed • Change cutting speed

Built-up Edge
• Incorrect workpiece • Use soft jaws
clamping • Check tool overhang / use anti vibration bars
• Incorrect tool setup • Increase cutting speed
• Incorrect cutting speed • Check center height
• Incorrect center height

Vibration

150 ISCAR