Page 108 - THREADING CATALOG

USER GUIDE
THREAD TURNING Plastic Deformation • excessive heat in cutting zone • reduce RPM / reduce depth of
Troubleshooting

Cause
Solution
cut / check turned dia.
• wrong carbide grade
• use coated grade / use harder grade
• inadequate coolant supply
• depth of cut too large
• apply coolant
• reduce depth of cut / increase no. of passes
• cutting speed too high
• reduce cutting speed
• nose radius too small
• if possible use insert with larger radius
• infeed depth too small
• modify flank infeed / increase depth of cut
Premature Wear • cutting speed too high • reduce RPM
• highly abrasive material
• use coated grade
• apply coolant
• inadequate coolant supply
• wrong inclination anvil
• reselect anvil
• wrong turned dia. prior to threading
• check turned dia.
• check center height
• insert is above center line
• wrong turned dia. prior to threading • check turned dia.
• wrong grade • use tougher grade
Insert Breakage • incorrect center height • check center height
• poor chip control
• change to M-type / B-type inserts
and use modified flank infeed

• cutting edge too cold • increase RPM / increase depth of cut
• wrong grade • use coated grade
Build Up Edge • incorrect cutting speed • increase cutting speed
• inadequate coolant supply
• apply coolant

• incorrect workpiece clamping • use soft jaws
• incorrect tool setup • check tool overhang / use anti-vibration bars
• incorrect cutting speed • increase cutting speed
Vibration • incorrect center height • check center height

• unsuitable threading profile • adjust to correct tool, anvil, and insert
Incorrect Thread Profile
• adjust center height
• incorrect center height
• change the program
• incorrect pitch in the program

ISCAR
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