Unlock peak performance in your CNC machining with our Milling Speed and Feed Rate Calculator. Accurately determine optimal spindle speed (RPM), feed rate (IPM), and chip load per tooth for various materials and cutter diameters. Achieve precision, extend tool life, and maximize material removal rates easily.
Formula:
The key formulas for milling speed and feed rate are:
- Spindle Speed (N) in RPM:
N = (Vc × C) / (π × D)
Where:N= Spindle Speed (Revolutions Per Minute)Vc= Cutting Speed (Surface Feet per Minute - SFM, or meters per minute - m/min)D= Cutter Diameter (inches or mm)C= Conversion Factor (12for SFM/inches,1000for m/min/mm)π≈ 3.14159
- Feed Rate (Fm) in IPM/mm/min:
Fm = Ft × Nt × N
Where:Fm= Feed Rate (Inches Per Minute - IPM, or mm per minute - mm/min)Ft= Chip Load per Tooth (Inches Per Tooth - IPT, or mm per tooth - mm/tooth)Nt= Number of Teeth (Flutes) on the cutterN= Spindle Speed (RPM, calculated above)