Milling machines are used to machine flat, rough, and irregular surfaces by feeding a workpiece against a rotating cutting tool called a milling cutter. The main components of a milling machine include the column, base, knee, saddle, swivel table, power feed mechanism, table, spindle, overarm or overhanging arm, arbor support, and ram. The milling machine removes metal from the workpiece as it is fed past the rotating cutting tool.