Types of drilling machines

 The different types of drilling machines are: 

1. Portable drilling machine (or) Hand drilling machine 

 2. Sensitive drilling machine (or) Bench drilling machine 

 3. Upright drilling machine 

 4. Radial drilling machine 

 5. Gang drilling machine 

 6. Multiple spindle drilling machine 

 7. Deep hole drilling machine

Portable drilling machine

Portable drilling machine can be carried and used anywhere in the workshop. It is used for drilling holes on workpieces in any position, which is not possible in a standard drilling machine.

Sensitive drilling machine

It is designed for drilling small holes at high speeds in light jobs. The base of the machine is mounted either on a bench or on the floor by means of bolts and nuts. The machine is named because of the reason that the operator can sense the progress of the drill into the work , as it is fed by hand.

Gang drilling machine 

Gang drilling machine has a long common table and a base. Four to six drill heads are placed side by side. The drill heads have separate driving motors. This machine is used for production work. A series of operations like drilling, reaming, counter boring and tapping may be performed on the work by simply shifting the work from one position to the other on the work table. Each spindle is set with different tools for different operations.

Multiple spindle drilling machine

 This machine is used for drilling a number of holes in a workpiece simultaneously and for reproducing the same pattern of holes in a number of identical pieces. A multiple spindle drilling machine also has several spindles. A single motor using a set of gears drives all the spindles. All the spindles holding the drills are fed into the work at the same time. The distances between the spindles can be altered according to the locations where holes are to be drilled.

Deep hole drilling machine

 A special machine and drills are required to drill deeper holes in barrels of gun, spindles and connecting rods. The machine designed for this purpose is known as deep hole drilling machine. High cutting speeds and less feed are necessary to drill deep holes. A non rotating drill is fed slowly into the rotating work at high speeds. Coolant should be used while drilling in this machine.