CNC milling PEEK requires understanding its unique properties as a semi-crystalline thermoplastic. Proper thermal management is critical — too much heat changes crystallinity and dimensions.
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.001") |
| Surface Finish | Ra 0.8-3.2 μm |
| Cutting Speed | 100-250 m/min (SFM 330-820) |
| Feed Rate | 0.05-0.15 mm/tooth |
| Tooling Recommendations | Sharp uncoated carbide, 2-3 flutes with polished flutes. O-flute single-flute for finishing. |
Use sharp, uncoated carbide tools
Moderate speeds to avoid melting
Compressed air cooling preferred (no oil contamination)
Support thin walls to prevent deflection
Anneal stock before machining for stability
Semiconductor fixtures
Medical device housings
Bearing retainers
Valve seats
Electrical insulators
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