Flat chisel
Cross cut chisel
Half-round nose chisel
Web chisel
Half-round nose chisel are used for cutting curved grooves (oil grooves).
Insufficient coolant supply
Broken the tip of cutting edge of the tap
Hole size slightly less than the tap drill size
Hole size slightly more than the tap drill size
The clearance angle is too big
The clearance angle is too small
The cutting speed is too low
Feed rate is too high
Counter sink drill 75 Degree
Counter sink drill 80 Degree
Counter sink drill 90 Degree
Counter sink drill 120 Degree
Poor wedging action
Weak cutting edge
Rough hole surface
Increased point angle