Milling machine is a machine tool that uses a milling cutter to machine multiple surfaces of a workpiece. Usually the rotary motion of the milling cutter is the main motion, and the movement of the workpiece and the milling cutter is the feed motion. In addition to milling planes, grooves, gears, threads and spline shafts, but also to process more complex surfaces, higher efficiency than the planer, in the machinery manufacturing and repair departments are widely used. In addition, the metal milling machine can also be used for the surface of the rotating body, hole processing and cut off work. When the milling machine is working, the workpiece is mounted on the table or indexing head and other accessories, the milling cutter rotates as the main movement, supplemented by the table or the milling head’s feed movement, the workpiece can obtain the required machining surface. Because it is a multi-flute intermittent cutting, and therefore the productivity of the milling machine is high. Simply put, a milling machine is a machine tool that can mill, drill and bore metal workpieces.