Flat chisel

Cross cut chisel

Half-round nose chisel

Web chisel

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