
Milling operations remove material by feeding a workpiece into a rotating cutting tool with sharp teeth such as an end mill or face mill Calculations use the desired tool diameter number of teeth cutting speed and cutting feed which should be chosen based on the specific cutting conditions including the workpiece material and tool material Feeds and speeds formula First is the formula to find the RPM RPM SFM X 382 diameter of the tool SFM Surface Feet per Minute You can also use the RPM calculator below Next the formula for the feedrate uses the RPM from the previous calculation Feedrate RPM