Radial drilling machine can be used to drill pieces of medium to large size. Radial drilling machine has a larger circular base over which a heavy round column is mounted. A radial arm which is allowed to move freely over the length of column is placed. Drill head mechanism is mounted over this arm. This drill head mechanism is free to move throughout the length of the arm. Not only these two but the radial arm can swing 3600. So due to these three features radial drilling machine can drill large jobs also. If the job is small it can be mounted over the table and if the job is large it can be drilled by keeping it on the floor. There are three types of radial drilling machines
a.      Plain drilling machine
b.      Semi universal drilling machine
c.      Universal drilling machine
