Feeds & Speeds Calculator
Spindle rpm and feed rate for turning and milling, worked out from cutting speed and tool diameter. This free version covers mild steel and brass, in HSS or carbide. Metric, no login.
Operation
Tool
Pass
Result
Full version: 15 materials, drilling and tapping, power, cutting time and G-code for HAAS or 828D. Request access
Starting values from general machining tables. Use the tool maker's data where you have it, and check the result against your machine and set-up before cutting.
How it's worked out
- n = 1000 × Vc ÷ (π × D)
- Spindle speed in rpm from cutting speed Vc (m/min) and diameter D (mm), held to the maximum spindle speed you enter.
- vf = f × n
- Turning feed rate in mm/min from feed per revolution.
- vf = fz × z × n
- Milling feed rate in mm/min from feed per tooth and the number of flutes.
- Vc range
- Roughing starts low in the material's range; finishing runs higher with a lighter feed.