Page 79 - 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 sloped surfaces (up to 7°), reduce the feed rate by 30-50% when entering and exiting.
5 Check cooling lubricant and 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 Check the adaptation. Use hydraulic clamping chuck, MAXIN power chuck or side lock systems.
4 Increase workpiece chucking force.

Excessive Flank Wear
1 Check that the correct geometry is used.
2 Reduce cutting speed.
3 Increase internal coolant pressure.

Excessive Flute Land Wear
1 Check that the correct geometry is used.
2 Check the runout and make sure it is within 0.02 mm T.I.R. (radial and axial).
3 Reduce cutting speed.
4 When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 30-50% when entering and exiting.
5 Increase coolant pressure.
6 Check the chisel point runout and make sure it is within 0.02 mm T.I.R.
7 Increase workpiece chucking force stability and rigidity.
8 If there is low pocket gripping force - replace drill body.

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

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).

2 Reduce feed rate.

Ø > D nominal + 0.15mm 3 Check the chisel point runout and make sure that it is within 0.02 mm T.I.R.

D nominal 4 Wrong cutting edge. Replace head.
Ø < D nominal - 0.03mm
5 Increase workpiece chucking force.

6 Check the adaptation. Use hydraulic clamping chuck, MAXIN power chuck or side clamping systems.

7 Increase internal coolant pressure.

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 Use double margin geometry.

Hole Not Straight:

1 Use 2M geometry.

2 Drill a pre-hole for centering (check recommendations for pre-hole operation).
3 Increase coolant pressure, improve jet direction in case of external coolant supply.

4 Increase the feed.

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.

Burrs on Exit
1 Reduce the feed rate by 30%-50% when exiting.

2 Replace the worn head.

3 Check the adaptation. Use hydraulic clamping chuck, MAXIN power chuck or side clamping systems.

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