Page 182 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 182
USER GUIDE
SOLID CARBIDE DRILLS
Troubleshooting
Problem Cause Solution
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 cutting corner • Replace drill or regrind cutting edge.
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.
180 ISCAR
