Каталог Iscar монолитные сверла 2022 - страница 32

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Troubleshooting

ProblemCauseSolution
Drill breakage• Poor clamping of the chuck• Check the clamping. Use hydraulic clamping chuck, maxin power chuck or a shrink system.
• Workpiece movement• Increase workpiece chucking force.
• Wrong drill• Check drill type and drilling depth, cooling system and workpiece material.
• Insufficient coolant• Check cooling lubricant. Increase coolant pressure. In the case of external coolant supply, improve jet direction and add cooling jets.
• Unsuitable cutting conditions• Reduce feed.
• Worn out drill center point (chisel)• Regrind cutting edge.
• Insufficient chip evacuation• Use pecking cycle.
Chipping on the cutting corners• Poor clamping of the chuck• Check the clamping and adaptation. Use hydraulic clamping chuck, maxin power chuck or a shrink system.
• Workpiece movement• Increase workpiece chucking force.
• Wrong drill• Check drill type and drilling depth, cooling system and workpiece material. Possibly use longer drill.
• Insufficient coolant• Check cooling lubricant. Increase coolant pressure. In the case of external coolant supply, improve jet direction and add cooling jets.
• Unsuitable cutting conditions• Check cutting parameters, and possibly reduce feed.
• Worn out or broken cuttingcorner• Replace drill or regrind cuttingedge.
Problem: Burrs on exit• Unsuitable cutting conditions• Reduce feed by 30-50% during exit.
• Worn out drill• Replace drill.
Rough surface finish• Unsuitable cutting conditions• Adjust feed to improve chip flow.
Ra• Large runout• Make sure that the drill’s runout is within
0.02 mm (radial & axial).
• Chip jamming• Reduce cutting speed.
• Increase coolant pressure.
• Apply pecking procedure.
Deviation of hole position• Large runout• Make sure that the drill runout is within 0.02 mm (radial & axial).
• Poor stability• Check and improve drill and workpiece clamping rigidity.
• Rough application• When drilling hard materials or sloped surfaces, reduce feed by 30-50% during entrance. • Use a short pilot drill with 140° point angle.