Page 93 - 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 50-70% 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 Increase workpiece chucking force.

Excessive Flank Wear
1 Reduce cutting speed.
2 Increase internal coolant pressure.

Excessive Land Wear
1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial).
2 Reduce cutting speed.
3 When drilling rough, hard or sloped surfaces (up to 7°), reduce the

feed rate by 50%-70% when entering and exiting.
4 Increase coolant pressure.
5 Check the chisel point runout and make sure it is within 0.03 mm T.I.R.
6 Increase workpiece chucking force stability and rigidity.

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

Ø > D nominal + 0.15mm Deviation of Hole Tolerance
D nominal 1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial cutting points).
Ø < D nominal - 0.03mm 2 Reduce feed rate.
3 Check the chisel point runout and make sure it is within 0.03 mm T.I.R.
Ra 4 Worn cutting edge. Replace head.
5 Increase workpiece chucking force.
6 Increase internal coolant pressure.

Surface Finish Too Rough
1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial).
2 Adjust the feed for improved chip formation.
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 0.03 mm T.I.R.
6 Use pecking cycle.
7 Replace the drilling head

Hole Not Straight
1 Drill a pre-hole for centering (check recommendations for pre-hole operation).
2 Increase coolant pressure, improve jet direction in case of external coolant supply.
3 Increase the feed.

Inaccurate Hole Position
1 Check the runout and make sure it is within 0.03 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 50%-70% 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 0.03 mm T.I.R.

Burrs on Exit
1 Reduce the feed rate by 50%-70% when exiting.
2 Replace the worn head.

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