Drills or drilling machines is essential machine tool in the workshop. And it’s specified according to their types. Thus, the portable machine is specified as per the maximum diameter it can handle. On the other hand, the size of the sensitive and the upright drilling machine is specified through the size of the huge workpiece centred under the spindle. Besides, it’s quite smaller than the distance between the face of the column & the axis of the spindle. Apart from that, the size of the drill which the machine can operate, maximum travel of the spindle, taper number of the spindle, and so on are needed to specify the machine. Besides, the size of the radical drill is specified through the diameter of the column & the length of the radical arm.