Owing to drilling machines speed, proper size/capacity as well as accurate cutting depth, the available different types include the portable, standing, sensitive, gang, multiple-spindle drilling machines, radial drilling machines, automatic drilling machines to perform varied works effectively.
The portable drilling machine of common purpose is used extensively in many workshops for boring holes and is operated using a hand drill that have power electric motors. The major improvement of a portable drilling machine is that all parts of it are smaller and compressed better fitted in structure. The motor in this machine is operated either alternating current or direct current. These drills allow maximum depth of holes having diameter ranging from 12 mm to 18 mm
The type radial drill press employs the cutting tool guide that works with rotary machining to produce perfect holes. A drill is used for accurately locate holes of different sizes into or through surfaces of work-pieces to depths. What is more, a drilling machine also executes other special operations like tapping(cutting a thread in a drilled hole), turning, reaming, spot facing( done over a surface area or on a curved surface), both counter boring to extend the upper end of a hole to a fixed depth and countersinking( tapering). The drilling machines are positioned on the standing or can be bolted to the workbench or floor. Drill speeds may be varied physically with the help of pulleys and belt arrangement.
The radial drilling machine tool is also automated that uses automatic operations through CNC (Computer Numerical Control) system. With CNC drills, precise size and repeatable results are achievable for component quality. Also the drilling machines may be useful for performing diverse workshop jobs such as sanding, honing, polishing and other rotating accessories of the chuck.

