Cutting Speed Calculator
Cutting speed (Vc in m/min and SFM) from tool or workpiece diameter and spindle speed.
Inputs
mm
rpm
Results
- Cutting speed
- 188.5 m/min
- Surface speed
- 618 SFM
Formula
Vc = π × D × n ÷ 1000
SFM = Vc × 3.2808
Assumptions & limits
- For turning use the workpiece diameter; for milling and drilling use the tool diameter.
Worked example
π × 50 × 1200 ÷ 1000 = 188.5 m/min ≈ 618 SFM.