Page 129 - HOLE MAKING CATALOG p001-148

USER GUIDE INDEXABLE DRILLS

Troubleshooting Oversized holes Cone Hole

Undersized holes

Rotating drill Rotating drill
• Check that overlapping is correct • Use shorter drill overhang (if possible)
• Reduce feed by 30-50%
between inner and outer inserts • Check that overlapping is correct
• Check inner insert over center
• Increase coolant pressure between inner and outer inserts
• Change the insert chipbreaker • Check inner insert is positioned over center

Non-rotating drill within its limits
• Check misalignment • Increase coolant pressure
• Check that overlapping is correct • Change the insert chipbreaker

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
• Change the insert chipbreaker between inner and outer inserts
• Check inner insert is positioned over center
Pin in hole Vibrations
within its limits
• Rotate drill 180 degrees
• Increase coolant pressure
• Change the insert chipbreaker

Bad Surface Finish

Rotating drill Rotating drill
• Use shorter drill overhang (if possible) • Improve chip formation (change chipbreaker
• Reduce feed by 30-50%
• Check that overlapping is correct type or cutting condition)
• Increase coolant pressure
between inner and outer inserts • Increase speed and reduce feed
• Check inner insert is positioned over center within its limits • Stabilize clamping device
• Increase coolant pressure
• Change the insert chipbreaker Non-rotating drill
• Improve chip formation (change chipbreaker
Non-rotating drill
• Check misalignment type or cutting condition)
• Check that overlapping is correct • Increase coolant pressure
• Increase speed and reduce feed
between inner and outer inserts • Stabilize clamping device
• Check inner insert over center
• Rotate drill 180 degrees
• Increase coolant pressure
• Change the insert chipbreaker

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