Milling and end mill speeds and feeds (RPM, feed rate)
Spindle speed, table feed, feed per revolution and cutting time for face mills and end mills.
✣Milling calculator
Spindle speed n—rpm
Feed rate Vf—mm/min
Feed per revolution—mm/rev
Cutting time—
n = 1000 × Vc ÷ (π × D) Vf = fz × z × n Time = L ÷ Vf
Red = input dimensions, green = rotation and motion. Schematic, not to scale.
Notes
- When the radial depth of cut is small (less than half the tool diameter), chips get thinner, so fz is often raised (chip thinning). Check the tool maker’s recommendation.
All values are guides. Start from the tool maker’s recommended cutting data and adjust for your machine, workholding and coolant. Calculations run in your browser; nothing you enter is sent anywhere.