Calculate spindle speed and feed rate from cutting speed, tool diameter, chip load and flute count.
Using the calculator
Enter values that match the tool, material and operation. Check the unit beside each field before calculating.
Calculation
Use this as a starting calculation for milling. Confirm tooling, machine limits and the cutter maker’s recommendations before production.
Reading the result
The result follows the relationship shown on this page. Final shop settings also depend on material, tool geometry, workholding, machine capability, coolant and the actual cut.
Worked example
For example, with 250 m/min cutting speed, a 10 mm cutter, 4 flutes and 0.05 mm/tooth chip load, the calculation gives about 7,958 RPM and 1,592 mm/min feed rate.