One of the first tools on any list of practical power tool equipment, is the portable electric drill. Although it is called a drill, this is just one of the many jobs that this tool can carry out. All you have to do is add a suitable accessory and your drill will service efficiently as a drum or disc sander, polisher, screwdriver, grinder, doweling jig, and much more. It can also be used to drive specially designed units such as a belt sander or even a small late. You can buy a stand for your portable drill and use it as a stationary drill press. Basically it is a lightweight multipurpose shop.
The capacity of your drill can be judged by the manufacturers specifications. As the size of the drill increases so does its power, however, its top speed will usually decrease. This is because the torque or power of the spinning is increased at the expense of speed. Jobs such as drilling half inch holes in steel call for good power but low rpm, while drilling small holes in wood can be carried out with low power and high rpm. There is always some overlapping functions even among tools that are different sizes. You can occasionally use a small drill to make holes in steel by working in steps, starting with a small drill bit and gradually increasing the size until you reach the dimensions you require. You have to avoid overtaxing your tool. If it gets warm, or stalls, you are obviously asking too much of it.
Most drills these days have a trigger controlled variable speed feature, which makes the drill even more versatile. It is often good practice to start working at slow speed and gradually increase rpm until the drill is working without strain.
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