Crumbling of outer corner
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| Possible causes | Solution |
| non rigid conditions, insufficient workpiece clamping | rigid clamping of workpiece |
| deviation from concentricity too large | check and correct concentricity if possible |
| interrupted cut | reduce feed |
| Possible causes | Solution |
| non rigid conditions, insufficient workpiece clamping | rigid clamping of workpiece |
| deviation from concentricity too large | check and correct concentricity if possible |
| interrupted cut | reduce feed |