There are several failure mode of the drill bit. PURROS summarizes the following situations:
Built-up edge
Cause
1. The cutting speed is too slow
2. The blade is too wide
3. No coating on the edge
The tip crack on
Cause
1. Rigid and not tight enough
2. Beating too big
3. Intermittent cutting
The flank face abrasion wear out
Cause
1. Cutting speed is too fast
2. Feed is too small
3. Lip Relief Angle is too small
The major Lip Crack on
Cause
1. Rigid and not tight enough
2. Intermittent cutting
3. Excessive wear
4. Wrong tools
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