Page 181 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE

Troubleshooting
Problem Cause Solution
Chipping on the chisel edge • Poor clamping of the chuck • Check the clamping. Use hydraulic clamping chuck,
maxin power chuck or a shrink system.
• Unsuitable cutting conditions • Decrease feed, increase coolant pressure.
• Chisel runout • Check or replace the clamping adaptation. SOLID CARBIDE DRILLS
• Workpiece movement • Increase workpiece chucking force.

Chipping on the cutting • Poor clamping of the chuck • Check the clamping. Use hydraulic clamping chuck,
edges / built-up edge maxin power chuck or a shrink system.
• Unsuitable cutting conditions • Increase cutting speed, reduce feed rate.
• Insufficient coolant • Check cooling lubricant. Increase coolant
pressure. In the case of external coolant supply,
improve jet direction and add cooling jets.
• Rough application • Reduce feed rate by 30-50% during entry and exiting.

Excessive wear on the • Insufficient coolant • Check cooling lubricant. Increase coolant
cutting corners pressure. In the case of external coolant supply,
improve jet direction and add coolant jets.
• Large runout • Check if the runout is within 0.02 mm T.I.R. (radial & axial)
• Unsuitable cutting conditions • Reduce cutting speed, increase feed.
• Rough application • Reduce feed rate by 30-50% during entry and exit.
• Poor clamping of the chuck • Check the clamping. Use hydraulic clamping chuck,
maxin power chuck or a shrink system.

Chipping on the lands • Workpiece movement • Increase workpiece chucking force.
• Insufficient coolant • Check cooling lubricant. Increase coolant
pressure. In the case of external coolant supply,
improve jet direction and add coolant jets.
• Wrong drill • Check drill type, drilling depth, cooling
system and workpiece material.
• Unsuitable cutting conditions • Increase feed. When spot drilling, reduce feed.
Hole diameter out of tolerance • Unsuitable cutting conditions • If hole size is too large, increase cutting speed or reduce feed.
If hole size is too small, reduce cutting speed or increase feed.
• Poor clamping of the chuck • Check the clamping. Use hydraulic clamping chuck,
maxin power chuck or a shrink system.
• Large runout • Make sure that the drill’s runout is within
0.02 mm (radial & axial).
• Worn out center point (chisel) • Regrind cutting edge or replace the drill.

Hole not straight • Insufficient chip evacuation • Use pecking cycle.
• Poor clamping of the chuck • Check the clamping. Use hydraulic clamping chuck,
maxin power chuck or a shrink system.
• Workpiece rigidity • Increase workpiece chucking force.
• Worn out drill center point (chisel) • Regrind cutting edge.
• Unsuitable cutting conditions • Increase feed. When spot drilling, reduce feed.

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