| Category | Problem | Cause | Remedy |
|---|---|---|---|
| Milling | Workpiece inaccuracy (4/5) | Poor tool holder rigidity | Replace with shorter/more rigid tool holder |
| Milling | Workpiece inaccuracy (5/5) | Poor spindle rigidity | Use larger spindle |
| Drilling | Worn outer corners | Excessive speed | Reduce speed to optimum - may be able to increase feed |