Page 128 - HOLE MAKING CATALOG p001-148

INDEXABLE DRILLS USER GUIDE

Troubleshooting
Irregular Conditions for DR Drills

If surface slope exceeds 5º, reduce feed by 50% Chipping Along Machine Troubleshooting
during penetration or when exiting. It is preferred Cutting Edge Vibrations
to pre-face the surface to eliminate slope.
Solutions Solutions
123
1 Reduce entrance feed. 1 Check mounting of drill.
1 Drilling into a pre-hole reduces feed to 2 Choose a tougher grade. 2 Check mounting
eliminate deflection(1) of the drill body. 3 Choose a geometry
of workpiece.
2 Drilling an interrupted cut reduces feed during crossing with open chip breaking 3 Increase feed. If drilling
to eliminate deflection(1) of the drill body. for higher feeds.
(SOMT, WOLH) a very soft material,
3 Insufficient stability of workpiece requires 4 Reduce feed.* reduce feed and
additional support. Reduce feed. 5 Reduce cutting speed. increase speed.*
6 Increase coolant 4 Reduce cutting speed.
(1) Deflection may be observed by a mark on the drill body. pressure.
Note: For irregular applications, use DR drills with XOMT
inserts as a first priority. Chipping of Center Insert Insufficient Torque

Stacked Plates Solutions Solutions
Drilling operation is not recommended, but may be done
by specially designed drills in 16-60 mm range. 1 Check mounting of drill. 1 Reduce feed.*
Apply standard cutting data. 2 Check mounting 2 Choose a geometry with

Regular Conditions for DR Drills of workpiece. a looser chipformer.
3 Reduce entrance feed.
4 Reduce cutting speed.
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 - Excessive Flank Wear Insufficient Power
Troubleshooting DR Chips
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.*
3 Choose a geometry with
pressure/volume.
3 Choose a better wear a looser chipformer.

resistant grade.

* Use GF chipformer

Solutions Solutions

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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