Page 118 - Aluminum_Machining_catalog_2023

USER GUIDE
INDEXABLE DRILLING INSERT

Troubleshooting

Irregular Conditions for DR Drills Undersized Holes Oversized Holes

If surface slope exceeds 5º, reduce feed by 50%
during penetration or when exiting. It is preferred
to pre-face the surface to eliminate slope.
1 2 3 Rotating Drill
• Check that overlapping is correct
between inner and outer inserts.
• Check inner insert over center.
• Increase coolant pressure.
Non-Rotating Drill
1 Drilling into a pre-hole reduces feed to • Check misalignment.
(1)
eliminate deflection of the drill body. • Check that overlapping is correct
between inner and outer inserts.
2 Drilling an interrupted cut reduces feed during crossing • Check inner insert over center.
(1)
to eliminate deflection of the drill body.
3 Insufficient stability of workpiece requires • Rotate drill 180 degrees.
• Increase coolant pressure.
additional support. Reduce feed.
(1) Deflection may be observed by a mark on the drill body.
Stacked Plates Pin in Hole Vibrations
Drilling operation is not recommended,
but may be done by specially designed drills.
Apply standard cutting data.
Regular Conditions for DR Drills

Rotating Drill
• Use shorter drill overhang (if possible).
Indexable Insert Drills - • Reduce feed by 30-50%.
Troubleshooting DR Chips • Check that overlapping is correct
Chip Jamming Due Chip Jamming Despite between inner and outer inserts.
to Long Chips Short Chips • Check inner insert is positioned over center within its limits.
• Increase coolant pressure.
Non-Rotating Drill
• Check misalignment.
Solutions Solutions • Check that overlapping is correct
1 Increase feed. 1 Increase coolant between inner and outer inserts.
2 Long chips that rotate pressure/volume. • Check inner insert over center.
around the drill are 2 Reduce cutting speed. • Rotate drill 180 degrees.
problematic. If chip • Increase coolant pressure.
formation can not be
improved by changing
the machining conditions,
use a pecking cycle.

116 ISCAR