Precisely calculate the ideal spindle speed (RPM) for your machining operations using our free online calculator. Optimize cutting performance for milling, turning, and drilling by converting surface feet per minute (SFM) or meters per minute (m/min) to revolutions per minute effortlessly. Enhance tool life and surface finish today!
Formula:
The formula to calculate Spindle Speed (RPM) is:
RPM = (Cutting Speed × Unit Conversion Factor) / (π × Diameter)
- RPM: Revolutions Per Minute
- Cutting Speed: Surface Feet Per Minute (SFM) or Meters Per Minute (m/min)
- Unit Conversion Factor: 12 (for SFM and Inches) or 1000 (for m/min and Millimeters)
- π: Pi (approximately 3.14159)
- Diameter: Tool Diameter or Workpiece Diameter