Definition of milling machine. : a machine tool on which work usually of metal secured to a carriage is shaped by rotatingmilling cutters.

Milling machines are very versatile. They are usually used to machine flat surfaces, but can also produce irregular surfaces. They can also be used to drill, bore, cut gears, and produce slots. The type of milling machine most commonly found in student shops is a vertical spindle machine with a swiveling head

Milling is a process performed with a machine in which the cutters rotate to remove the material from the work piece present in the direction of the angle with the tool axis. With the help of the milling machines one can perform many operations and functions starting from small objects to large ones.

Milling operations may be classified under four general heading as follows: FaceMilling, machining flat surfaces which are at right angle to the axis of the cutter. … Angular Milling, machining flat surfaces which are at an inclination to the axis of the cutter.