Page 130 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE
INDEXABLE DRILLS Chip jamming Broken Screw

• Lubricate the screw before tightening
Rotating drill • Use recommended torque wrench
• Improve chip formation (change chipbreaker
type or cutting condition) Insufficient machine power-
• Increase coolant pressure
Non-rotating drill
• Improve chip formation (change chipbreaker
type or cutting condition)
• Increase coolant pressure

• Reduce speed and feed
Deflection • Use recommended chipbreaker for low feed

Insufficient machine torque

Rotating drill
• Use shorter drill overhang (if possible) • Reduce feed
• Reduce feed by 30-50% • Use recommended chipbreaker for low feed
• Check that overlapping is correct
between inner and outer inserts
• Check inner insert is positioned over center within its limits
• Increase coolant pressure Chip Formation Problems
• Change the insert chipbreaker
• Stabilize clamping device Long chip/ Chip jamming:
This typical problem with stainless or low carbon steel,
Non-rotating drill can affect hole quality, especially on surface finish, and
• Check misalignment in some cases can cause insert or tool breakage.
• Check that overlapping is correct
between inner and outer inserts
• Check inner insert is positioned over center within its limits Optimal Shape Too Long Too Tight
• Rotate drill 180 degrees
• Increase coolant pressure
• Change the insert chipbreaker

If machining at Increase
high speed, first speed within
reduce speed. recommended
If unsatisfactory, limits. If not
increase feed, but satisfactory,
do not exceed decrease feed.
upper limit.

128 ISCAR