The radial drilling machines are of three types, these are:
(a) Plain Radial Drilling Machine. In this type the arm is having vertical and horizontal movement of the drill head along the arm and circular movement of the arm in horizontal plane about the vertical column.
(b) Semi Universal Radial Drilling Machine. In this type of radial drilling machine, in addition to the above three movements the drill head can be swung about the horizontal axis perpendicular to the arm. This permits to drill a hole at an angle to the horizontal plane.
(c) Universal Radial Drilling Machine. In this drilling machine in addition to above four movements, the arm holding the drill head can be rotated on the horizontal axis. All these movements in radial drilling machine enable to drill on a work piece at any desired place at any angle.