Page 83 - HOLE MAKING CATALOG p001-148

USER GUIDE INDEXABLE DRILLS

Troubleshooting

Cutting Edge Chipping
1 Check the stability of the machine spindle, tool and workpiece clamping rigidity.
2 Reduce feed rate, increase speed.
3 If the drill vibrates, reduce cutting speed and increase feed rate.
4 When drilling rough, hard or angled (up to 12° angular surface), reduce the feed rate by 30-50%.
5 Check cooling lubricant. Increase coolant pressure. In case of external

coolant supply, improve jet direction and add cooling jets.

Chisel Area Chipping
1 Reduce feed rate.
2 Increase coolant pressure.
3 Increase workpiece chucking force.

Excessive Flank Wear
4 Reduce cutting speed.
5 Increase internal coolant pressure.

Excessive Land Wear
1 Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
2 Reduce cutting speed.
3 When drilling rough, hard or angled (up to 12° angular surface), reduce the feed rate by 30-50%.
4 Increase coolant pressure.
5 Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
6 Increase workpiece chucking force stability and rigidity.

Built-Up Edge
1 Increase cutting speed/feed.
2 Increase

Inaccurate Hole Position

1 Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).

2 Check the stability of the machine spindle, tool and workpiece clamping rigidity.

3 When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 30%-50% when entering.

4 Drill a pre-hole with a 140° point angle for centering.

5 Check the chisel point runout and make sure it is within 0.02 mm T.I.R.

Deviation of Hole Tolerance

1 Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial cutting points).

Ø > D nominal + 0.15mm 2 Reduce feed rate.

D nominal 3 Check the chisel point runout and make sure that it is within 0.02 mm T.I.R.
Ø < D nominal - 0.03mm
4 Wrong cutting edge. Replace head.

5 Increase workpiece chucking force.

6 Increase internal coolant pressure.

Burrs on Exit

1 Reduce the feed rate by 50%-70% during exit.

2 Replace the worn head.

Surface Finish Too Rough
1 Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
2 Adjust the feed for improved chip formation.
Ra 3 In case of chip jamming - increase the coolant flow and/or reduce the cutting speed.
4 Increase the coolant pressure.
5 Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
6 Use pecking cycle.
7 Replace the drilling head.

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