Page 107 - HOLE MAKING CATALOG p001-148
P. 107
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 6°), 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.
Excessive Flank Wear
1 Check that the correct geometry is used.
2 Reduce cutting speed.
3 Increase internal coolant pressure.
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 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 6°), 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.
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).
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 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).
Ra 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 0.02 mm T.I.R.
6 Use pecking cycle.
Insufficient Pocket Gripping Torque
1 Check unlocking gripping torque with TK DCM torque key. If there is no click indication - replace drill head.
2 Increase coolant pressure.
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 6°), 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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