There are several failure mode of the drill bit. PURROS summarizes the following situations:
Edge wear
Cause
1. Rigid and not tight enough
2. Beating too big
3. Inverted cone is too small
4. The coolant oil is not enough
The back of the tool has stripes
Cause
1. Rigid and not tight enough
2. Beating too big
3. Intermittent cutting
4. Waste grinder piece
(Add cooling fluid)
Chisel edge wear
Cause
The cutting speed is too slow.
Feed is too fast.
The angle of the cutting edge is too big.
The connection point crack on
Cause
The lip relief angle is too small
Cutting edge is too wide
Choose the wrong cutting tool
The nose of tool has plastic deformation
Cause
1. Cutting speed is too fast
2. Have not enough cooling
3. Chamfering error or no
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