Delrin Machining Data

Delrin (acetal / POM) machines like a soft metal: low cutting force, clean chips, and tight tolerances. The main risk is heat — a dull tool or slow rubbing can melt and gum the surface.

Key properties

Property Typical value
Density 0.051 lb/in³ (1.41 g/cm³)
Hardness ~M94 (Rockwell M)
Machinability Excellent
Coolant Usually none; air blast
Composition Polyoxymethylene (acetal)

Cutting speeds

Operation HSS (SFM) Carbide (SFM)
Milling 400 – 800 600 – 1200
Turning 400 – 800 600 – 1200
Drilling 300 – 500 400 – 700
Convert to RPM: RPM = (SFM × 3.82) / cutter diameter. Use the Feeds & Speeds calculators.

Tooling and tips

  • Very sharp tools and high RPM for a clean, glossy finish.
  • Keep chips clearing — trapped chips and heat will melt and gum the cut.
  • No coolant needed; an air blast clears chips and prevents heat buildup.

See Feeds and Speeds Chart and the full Feeds and Speeds Chart.

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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.