Page 32 - HOLE MAKING CATALOG p149-184

SOLID CARBIDE DRILLS USER GUIDE

Troubleshooting Cause Solution
• Poor clamping of the chuck
Problem • Check the clamping. Use hydraulic clamping chuck,
Drill breakage • Workpiece movement maxin power chuck or a shrink system.
• Wrong drill
• Increase workpiece chucking force.
• Insufficient coolant
• Check drill type and drilling depth, cooling
• Unsuitable cutting conditions system and workpiece material.
• Worn out drill center point (chisel)
• Insufficient chip evacuation • Check cooling lubricant. Increase coolant
pressure. In the case of external coolant supply,
improve jet direction and add cooling jets.

• Reduce feed.

• Regrind cutting edge.

• 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
• Wrong drill • Increase workpiece chucking force.

• Insufficient coolant • Check drill type and drilling depth, cooling system
and workpiece material. Possibly use longer drill.
Problem: Burrs on exit • Unsuitable cutting conditions
• Worn out or broken cutting corner • Check cooling lubricant. Increase coolant
• Unsuitable cutting conditions pressure. In the case of external coolant supply,
• Worn out drill improve jet direction and add cooling jets.

• Check cutting parameters, and possibly reduce feed.

• Replace drill or regrind cutting edge.

• Reduce feed by 30-50% during exit.

• 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

• Chip jamming 0.02 mm (radial & axial).
• Reduce cutting speed.
Deviation of hole position • Large runout • Increase coolant pressure.
• Apply pecking procedure.
• Poor stability
• Rough application • Make sure that the drill runout is within 0.02 mm (radial & axial).

• Check and improve drill and workpiece clamping rigidity.
• 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