Page 129 - ISCAR(HOLE_MAKING_CATALOG_65)
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USER GUIDE
INDEXABLE DRILLS
Troubleshooting
Undersized holes Oversized holes Cone Hole
Rotating drill Rotating drill
• Check that overlapping is correct • Use shorter drill overhang (if possible)
between inner and outer inserts • Reduce feed by 30-50%
• Check inner insert over center • Check that overlapping is correct
• Increase coolant pressure between inner and outer inserts
• Change the insert chipbreaker • Check inner insert is positioned over center
within its limits
Non-rotating drill • Increase coolant pressure
• Check misalignment • Change the insert chipbreaker
• Check that overlapping is correct
between inner and outer inserts Non-rotating drill
• Check inner insert over center • Check misalignment
• Rotate drill 180 degrees • Check that overlapping is correct
• Increase coolant pressure between inner and outer inserts
• Change the insert chipbreaker • Check inner insert is positioned over center
within its limits
• Rotate drill 180 degrees
• Increase coolant pressure
Pin in hole Vibrations • Change the insert chipbreaker
Bad Surface Finish
Rotating drill
• Use shorter drill overhang (if possible)
• Reduce feed by 30-50%
• Check that overlapping is correct
between inner and outer inserts Rotating drill
• Check inner insert is positioned over center within its limits • Improve chip formation (change chipbreaker
• Increase coolant pressure type or cutting condition)
• Change the insert chipbreaker • Increase coolant pressure
• Increase speed and reduce feed
Non-rotating drill • Stabilize clamping device
• Check misalignment
• Check that Non-rotating drill
• is correct between inner and outer inserts • Improve chip formation (change chipbreaker
• Check inner insert over center type or cutting condition)
• Rotate drill 180 degrees • Increase coolant pressure
• Increase coolant pressure • Increase speed and reduce feed
• Change the insert chipbreaker • Stabilize clamping device
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