CNC Turning for Delrin (POM / Acetal)
Delrin turns beautifully with clean chip formation and excellent surface finish. Its rigidity allows tight tolerances to be held consistently, making it a favorite for precision plastic parts.
Recommended Machining Parameters
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.001") |
| Surface Finish | Ra 0.4-1.6 μm |
| Cutting Speed | 200-500 m/min |
| Feed Rate | 0.08-0.20 mm/rev |
| Tooling Recommendations | Sharp carbide or diamond inserts. Positive rake. No chip breaker needed — chips break cleanly. |
Expert Machining Tips
1
High speeds produce best finish
2
Sharp tools prevent melting
3
Air cooling usually sufficient
4
Light spring passes for best roundness
Common Parts Made
Gear blanks
Roller bushings
Threaded couplings
Precision sleeves
Cam followers
Machining Challenges
- Material may melt if speed too high or tool dull
- Static charge attracts chips to finished surface