Page 128 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE
INDEXABLE DRILLS Irregular Conditions for DR Drills Chipping Along Machine Troubleshooting

Troubleshooting

Vibrations
Cutting Edge
If surface slope exceeds 5º, reduce feed by 50%
Solutions
Solutions
during penetration or when exiting. It is preferred
to pre-face the surface to eliminate slope.
2 Choose a tougher grade. 2 Check mounting
of workpiece.
3 Choose a geometry
1 2 3 1 Reduce entrance feed. 1 Check mounting of drill.
with open chip breaking 3 Increase feed. If drilling
for higher feeds. a very soft material,
(SOMT, WOLH) reduce feed and
4 Reduce feed.* increase speed.*
5 Reduce cutting speed. 4 Reduce cutting speed.
6 Increase coolant
1 Drilling into a pre-hole reduces feed to pressure.
(1)
eliminate deflection of the drill body.
2 Drilling an interrupted cut reduces feed during crossing
(1)
to eliminate deflection of the drill body.
3 Insufficient stability of workpiece requires
additional support. Reduce feed.
(1) Deflection may be observed by a mark on the drill body.
Note: For irregular applications, use DR drills with XOMT Chipping of Center Insert Insufficient Torque
inserts as a first priority.
Solutions Solutions
Stacked Plates 1 Check mounting of drill. 1 Reduce feed.*
Drilling operation is not recommended, but may be done 2 Check mounting 2 Choose a geometry with
by specially designed drills in 16-60 mm range. of workpiece. a looser chipformer.
Apply standard cutting data. 3 Reduce entrance feed.
4 Reduce cutting speed.
Regular Conditions for DR Drills 5 Check drill runout
(should be 0.05 mm
maximum).

Note: For irregular applications, use DR drills with XOMT inserts
as a first priority.
Indexable Insert Drills -
Troubleshooting DR Chips Excessive Flank Wear Insufficient Power
Solutions Solutions
Chip Jamming due Chip Jamming
to Long Chips despite Short Chips 1 Reduce cutting speed. 1 Reduce cutting speed.
2 Increase coolant 2 Reduce feed.*
pressure/volume. 3 Choose a geometry with
3 Choose a better wear a looser chipformer.
resistant grade.
Solutions Solutions * Use GF chipformer
1 Increase feed. If drilling a 1 Increase coolant
very soft material, reduce pressure/volume.
feed and increase speed. 2 Reduce cutting speed.
2 Choose a geometry with
a tighter chipbreaker
for lower feeds (GF).
3 Long chips that rotate around
the drill are problematic.
If chip formation can not
be improved by changing
the machining conditions,
use a pecking cycle.

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