The drill has been closely associated in man’s march to technological advancement. Drilling implements probably came into being sometimes in the iron age or even earlier. Crude might be, he must have observed that by turning of a pointed bar spun between his hands, repeatedly at one place, can cut deep holes even in stones or wood. Since that time, it became the most favored tool in his collection of gears. The present shape of the drill has been arrived at by incorporating newer technologies and materials. From manually operated drills, we moved to a variety of power drills. In its present form, a drill is consisting of two parts, the driving mechanism, and drilling bit. With a powerful motor, enclosed in a gun-shaped body, equipped with a trigger-type on/off switch at the finger tips, the drill has become a versatile tool for both home and commercial use. The drill is an indispensable tool for trades including woodworking, metal working, construction and to DIY-ers and comes in various types, sizes and power ratings for a large variety of uses.
The electrically driven drills produce sufficient energy to generate a rotary motion to the attached bit. Connected to an electrical point with the help of an electric cord, the drill is ready to perform. You have to choose a right bit from the set of replaceable bits designed to do many different jobs. The bits, made of stainless steel or alloy steels with chromium or nickel coated tips for extra strength, are packed meticulously in the form of a kit. Another variation of electrically powered drill comes in the cordless variety. In cordless drills, a powerful rechargeable battery provides electric supply to the motor. After a work cycle, they are required to return to the recharging point. Compact Nickel-Cadmium rechargeable batteries are being replaced by Lithium-ion batteries those are smaller, light weight with higher current capacities to produce torque and speed rivaled by corded tools. Cordless tools are getting better with innovative brush-less motor and improved Lithium-ion battery technology for longer run-time on a single battery charge. Now, it is possible to energize small portable drills as required for jewelry purpose to big heavy-duty drills for masonry works. The recharging bays in an industry is a common sight as cordless drills are now an indispensable tool for assembly plants. A cordless drill is also handy to emergency services where power availability could be a problem.
Pneumatic drills are standard in a working environment. At the heart of a pneumatic drill is the power of compressed air supplied by an air compressor. An air compressor and pipes strung along the workspace to carry the compressed air are a common sight in an industrial environment. The air is compressed, employing rotary screw or piston-type motors, both electrical or gas driven, to pump air into a compressor tank. It is the pressure developed in the tank and quantity of air flow to an air tool that drives a pneumatic tool. There is no motor in a pneumatic drill. The compressed air forces vanes attached to a shaft that turns a flywheel to store rotational energy. When engaged, the flywheel provides enough power to create rotary motion in the attached bit. A standard air drill needs 3- 6 cubic feet per minute of air flow at 90 PSI. Air tools do not burn out if stalled, produce more torque to power a great variety of applications, be it road making, construction, wood cutting, auto repair, spray painting, orthopedic treatment, dental or opening of blocked arteries.
Versatility as Tool
Drills are not only used to bore holes; some drills come with added hammering action to intensify the speed of work. In particular cases, drills are used simply as a motor to drive a variety of applications such as screw driving, water pumps, cutting metal sheets, rotary sanding and polishing. Bits are designed to do different jobs like slicing or shaving, crushing, countersinking, and much more.
Advantages of Pneumatic Drill Over Electric Drill
Pneumatic drills are rugged, compact, lighter with heavy-duty rating. They can be designed ergonomically to work in confined spaces. As there are fewer moving parts in an air-powered motor than an electrical motor, they need relatively maintenance free. Pneumatic drills are well suited to work in a wet or damp environment, where use of an electrical motor can be hazardous. Due to more power, pneumatic drills can perform complex jobs more quickly. On the other hand, air drills are a bit expensive than electrical drills. Unless you have other uses for the air system, it is not viable for just one drill. Cordless electric drills come with freedom of tethered limitations and thus opening of new areas in industrial and home applications.