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CNC Speeds & Feeds Calculator

● Metric All outputs in mm/min · mm/tooth · RPM

Select your workpiece material, tool specification and operation to get recommended spindle speed, feed rate, chip load and depth of cut. Results are starting-point recommendations — adjust based on your machine's rigidity and your observed finish.

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Step 1 — Material & Tool
Configure Your Cut
Leave blank if not limited
Output
Recommended Parameters

Configure your tool and material
then press Calculate

Recommended Milling Direction
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Chip Formation Guide
How to use these numbers
  • These are starting-point recommendations. Your actual optimum will depend on machine rigidity, tool condition and workholding.
  • Start at 75–80% of the recommended feed rate and increase once you're happy with the finish and chip formation.
  • Good chips mean good cutting. Dust = too slow (rubbing). Long stringy chips = too fast or too deep.
  • For metals, use cutting fluid or compressed air to evacuate chips and keep the tool cool.
  • Downcut spirals and compression bits may need a 15–20% lower feed rate than shown.

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