Cordless Drill
A cordless drill is a great tool when you're working far from a power outlet or on a tall ladder. It is powered by a rechargeable battery in the drill handle. Some models have fixed batteries that are recharged by plugging the drill into a transformer. Increasingly common and far more handy are models that come with two removeable batteries. This way, one battery can always be in the charger so you are never without power.

There are other handy features available in cordless drills. Many are reversible and have variable speed, which makes them ideal for driving and removing screws. (These are often sold as "drill/drivers" or "driver/drills", but are essentially cordless drills with an extra function.) Several also have a clutch you can set so that the bit will stop before it strips the head of a screw.

Using a Cordless Drill
Before you can use a drill, you must select a bit and fasten it inside the chuck - the receptacle that holds the bit. In some models, you have to do this manually with device called a chuck key, which you turn in the side of the chuck to lock the bit in place. However, most cordless drills have a keyless chuck. After you insert the bit, grasp the chuck firmly with one hand and run the drill to fasten the bit. The keyless chuck is a handy feature, because it lets you pre-drill a screw hole and then replace the drill bit with a screwdriver bit (if you have a drill/driver) in a matter of seconds.

Regardless of the bit you're using, make sure it is properly centered and tightened before you begin work. A loose or poorly aligned bit is inaccurate and unsafe. If you are drilling a deep hole, pull the bit out a few times to clear the waste wood off the bit. Keep the drill's air ports clear to protect the motor from overheating.

Besides the features mentioned above, the main thing to consider when buying a cordless drill is power. A 12-volt drill will handle most tasks, but you'll still need a standard electric drill for heavy tasks such as using a large-diameter spade bit. Contractors often buy 18-or 24volt cordless-drill models for really heavy-duty work, but that's more power than a do-it-yourselfer is likely to need.

Caution:
Make sure the work is firmly supported and clamped down.
Wear goggles or safety glasses when using a drill.

Author: Carl Robinson
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