- Click on the problems to see probable causes and solutions!
Problems
Oversize
Causes
- Flute length too long.
- Too large a lip height.
Solutions
- Reduce the flute length.
- Reduce the lip height.
Hole diameter decreases
Causes
- Too much heat generated.
- Not enough coolant.
- Too high a cutting speed.
Solutions
- Use a drill with coolant holes.
- Increase the coolant flow.
- Reduce the cutting speed.
Poor straightness
Causes
- Too large a lip height.
- Tool holder run out is too high.
- Poor accuracy prep-hole.
- Prep-hole is too shallow.
Solutions
- Reduce the lip height.
- Improve tool holder run out.
- Improve prep-hole accuracy.
- Increase the prep-hole depth.
Position, roundness, finish
Causes
- Flute length too long.
- Poor work entry.
- Too high a feed on entry.
- Tool holder run out is too high.
Solutions
- Reduce the flute length.
- Use X thinning.
- Reduce the feed on entry.
- Improve tool holder run out.
Burrs att the exit
Causes
- Honing is too large.
- Feed rate too high at the exit.
Solutions
- Reduce the honing.
- Reduce the feed at the exit.
Causes
- Feed rate is too slow.
- Poor machinability of
the workpiece.
Solutions
- Increase the feed rate.
- Use a drill with coolant holes.
- Use step drilling.
Chips elongate
Breakage
Causes
- Flute length too long.
- Feed rate too high.
- Tool holder run out is too high.
Solutions
- Reduce the flute length.
- Reduce the feed rate.
- Improve tool holder run out.
Chipping of the outer edge
Causes
-Too high a feed at
the exit.
- Tool holder run out is too high.
Solutions
- Reduce the feed at the exit.
- Improve tool holder run out.
Chipping of the chisel edge
Causes
- Chisel edge is too wide.
- Poor initial entry.
Solutions
- Reduce the chisel edge.
- Reduce the feed on entry.
Outer edge / margin width
Causes
- Too high a cutting speed.
- High temperatures.
Solutions
- Reduce the cutting speed.
- Use a drill with coolant holes.
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