Machining speeds and feeds calculator

Convert supplied cutting speed and chip load into RPM and feed, then compare actual settings with entered machine limits.

Input units

Changing units reinterprets the entered numbers.

Effective cutting diameter

Supplied cutting speed

m/min

Supplied chip load per tooth

Effective tooth count

Actual-setting RPM

Leave empty to use theoretical RPM. The calculator never clamps it to a machine limit.

Machine limits and actual feed

Machine RPM limit

Machine feed limit

mm/min

Actual feed at selected RPM

mm/min

Shows the resulting chip load when feed differs from the calculation.

Feed at actual-setting RPM

636.62mm/min

Theoretical speed: 3183.099 RPM
Actual-setting speed: 3183.099 RPM
Achieved cutting speed: 100 m/min
Actual chip load: 0.05 mm

Use the effective cutting diameter and cutting values supplied for your actual tool and material. RPM and feed here are calculations, not recommended settings.

Converting cutting speed into spindle speed

A rotating cutting edge travels one circumference per revolution. Dividing the supplied surface speed by that circumference gives theoretical RPM. A 10 mm diameter at 100 m/min gives about 3,183 RPM.

Milling feed multiplies chip load by RPM and effective tooth count. Turning feed uses feed per revolution. Enter an actual RPM to recalculate both surface speed and feed. Machine limits show a comparison without changing your inputs.

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