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 A drill is a tool that, well, drills into various materials such as: wood, plastic, and even metal. While some drills are connected to a wall socket and powered through electric supply, others are powered through Rechargeable batteries. These latter kinds of drills are called cordless drills. Since these drills are not connected to any power cord, they offer freedom of mobility. These drills are applicable in places where there is no power source in the vicinity of the work area, or it is too far to be reached. Therefore, the cordless tools are rendered completely portable making them usable in the outdoors too. These tools are used by skilled workers, such as carpenters, masons, plumbers, and electricians, as well as domestic ‘do-it-yourselfers’. Cordless drills may also have a clutch setting to drive in screws. The cordless drill/driver can increase a worker’s efficiency by speeding and automating the process of drilling or driving, saving time as well as energy.
Features and working of a cordless drill / driver
 The cordless drill consists of a detachable drill bit like the one to the right that is fixed to the front end of the drill with a chuck. When the drill trigger is pressed, this drill bit begins rotating at high velocities. On being pressed against the point on the material at which the hole is to be drilled, this rotating appendage initiates a shearing and grinding action, slicing away miniscule granules from the material, resulting in a hole being bored. When a screwdriver bit is inserted in the chuck, this tool serves as a driver to drive screws into the material.
The drill is made of a sturdy, reinforced metal material to increase durability. The ergonomically designed handle of the drill coupled with the angle between the direction of the drill bit and the handle enhances the comfort factor for the user. If the handle has a rubberized coating, the comfort Level is increased even further and helps eliminate slips and dropping the drill. There may also be a side handle to provide a more stable grip to the device. Some cordless drills incorporate a precision balancing feature, dual ball bearings, and a field magnet, increasing efficiency. A Shift Lock drive facility enables the user to shift between the ‘drill’ and the ‘drive’ mode with ease, as well as lock out the clutch to permit sharper performance. Even after prolonged use, a planetary gear reduction feature eases the pressure on the bearings and the gears, ensuring a long life for the tool.
Some drills incorporate a ratcheting chuck to ensure that the bit is held tight in the grip. Sometimes, the bit holder may be magnetic. The user has the option to control the speed of the drill with the throttle provided for the same. Accuracy is further enhanced with the use of a large spindle bearing, for a perfectly centralized drilling performance. The tool can be easily serviced due to the fact that the brushes can be accessed from outside. Some tools have a unibody powertrain that aligns the clutch, gearbox, and motor, to increase the drivetrain efficiency. A steel-reinforced collar shields the chuck from external impacts.
Most cordless drills consume around 18 volts, to generate a no-load performance of around 0-400/0-1,500 revolutions per minutes (rpm) and a torque of approximately 550 inch. Lbs. The power is commonly provided by 2.4 to 4 A-h NiMH batteries. A battery charger is normally shipped with the device.
What to look for in a cordless drill / driver
 All the controls in the device should be easily accessible while the tool is being used. Since the device is used both for drilling as well as driving, there should be a speed-range switch with a higher range being used for drilling and a lower range being used for driving. A forward/reverse switch is another user-friendly feature. Even though a higher voltage would mean better performance, the weight of the tool may increase as the voltage capacity goes up. A keyless chuck enables the user to change drilling and screwdriver bits at ease without any key. The clutch can be manipulated to ensure the screws are driven to the required depth. As with any device that has so many moving parts, the noise Levels will naturally be high. A noise reducing feature built into the tool would be an advantage, benefiting the operator’s ears during prolonged use. Some popular manufacturers of cordless drills/drivers include Bosch, Dewalt, McCulloch, Milwaukee, and Porter Cable.
To see a complete listing of ToolKing.com's cordless drills, click here .
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