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Electric Drill

An electric drill as used for light construction work in the home. This versatile tool employs a universal motor, offering high torque at low speeds and reduced torque at high speeds, coupled through a two-speed transmission to the chuck assembly. 
As shown here the gears are set for low-speed running. Electrical safety is ensured through double insulation.

Types of drill bit include:-

(a) twist drill (for metal, plastic, wood, etc.).
(b) masonry bit.
(c) auger bit (for wood).
(d) high-speed wood bit. 

The jaws of most domestic electric drills will also accept accessories other than drill bits. Rotary wire brushes, polishing pads, grinding wheels, sanding disks, files, and cutting heads are common examples. Alternatively, the whole chuck assembly can be removed and the drill become a power source for a circular saw blade.

Types of drill :-

There are two classes of drills  those that have a rotary action, with a cutting edge or edges at the point and, usually, helical fluting along the shank; and those that work by percussive action, where repeated blows drive the drill into the material. 

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