A milling machine rotates a circular cutting tool to machine flat workpieces. The workpiece is held in a vice or clamp and can move in three perpendicular directions while the cutting tool rotates. The most common types are vertical and horizontal milling machines, where the main spindle is oriented vertically or horizontally. Key parts include the base, column, knee, table, spindle, and head. The table can move longitudinally while the workpiece is clamped to it.