Solid Carbide Drills
General Application Instructions
problem source heavy wear on the cutting corners insuffi cient coolant • Check cooling lubricant. In the case of internal coolant supply,
increase coolant pressure. In the case of external coolant supply,
adjust positioning of coolant jet. Cool from both sides.
workpiece movement • Stabilise workpiece chucking and check stability of machine tool.
wrong drill
cutting conditions
splintering on the chisel edge
built-up edge
splintering on the cutting edges
clamping chuck
solution
• Check drill type, drilling depth, cooling system,
and workpiece material.
• Reduce cutting speed; increase feed.
• Check clamping accuracy. Use hydraulic clamping
chuck or high-precision chucking system.
cutting conditions • Decrease feed; increase speed.
insuffi cient coolant • Check cooling lubricant. In the case of internal coolant supply,
increase coolant pressure. In the case of external coolant supply,
adjust positioning of coolant jet. Cool from both sides.
cutting conditions • Increase speed 20–30%.
clamping chuck
cutting conditions caused
by built-up edge
• Check clamping accuracy and torque transmission. Use hydraulic
clamping chuck or high-precision chucking system.
• Check cutting values, and possibly increase cutting speed.
thermal checking/comb cracking
widia.com
cutting conditions
• Adapt coolant and cutting conditions to reduce thermal shock.
T147
• Examine regularly for built-up edge.