Radial Drilling Machine

noun. a machine in which the drilling head is mounted to slide along a radial arm which can be rotated, raised, or lowered on a vertical mast to adjust the position of the drill above the workpiece. Often shortened to: radial.A radial drilling machine is a cylindrical geared electric drill head that is mounted on an axial armature that can rotate up to its full extent to bore into any substance. The main components are the drill head, column, spindle, and motor.A radial drill machine is a special purpose drilling machine. It normally has a drilling head that is mounted to slide along the radial arm. This radial arm can be raised, lowered, or rotated, on a vertical pole in order to adjust the position of the drill above the work piece.