This video goes over the below formula to help you quickly set speeds and feeds for your tools to run them in your CNC.
How to set tool RPM Formula: Ex: 4 Flute .5” Solid Carbide End Mill
3.82 X (Surface Feet Minute) / Diameter of Tool = RPM Surface Feet Minute (SFM) – will be provide to you from your tool provider and dictated on what material you are running. In this case tool mfg. recommends 180 SFM.
Example: 3.82 X 180 (SFM) / .5 = 1,375 RPM
How to set tool Feed Formula: Ex: 4 Flute .5” Solid Carbide End Mill
(Feed Per Revolution) X RPM = Feed
In mild steel the tool mfg. recommends .0025 per tooth. That means 4 flutes X .0025 to get Feed Per Revolution (FPR) = .01 FPR
Example: .010 (FPR) X 1,375 RPM = 14 in/min
Summary: In mild steel we will run this .5” end mill at 1,375 RPM with a 14 in/min. feed rate.