Calculator – Cutting Speed to RPM


Cutting Speed (feet per minute):

Diameter (inches):

RPM = 12*CS/(pi * diameter)


Suggested starting values (HSS tool)

Feet per minute
Steel (tough) 50–60
Mild steel 100–125
Cast iron (medium) 60–80
Stainless steels (300 & 400 series) 75–130
Bronzes 80–150
Aluminium 250–350
Brass 300-700

See also:  Selection criteria and calculation of speeds and feeds (TECH 1711)

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