CNC Milling is a method of using a rotating multi-edged tool (milling cutter) on a milling machine to process the workpiece. The main cutting motion is the rotation of the tool. According to whether the main movement speed direction during milling is the same as or opposite to the workpiece feed direction, it is divided into down milling and uphill milling. Scope of application: Plane milling, step milling, groove milling, forming surface milling, spiral groove milling, gear milling, and cutting.