Drills can be used for a lot more than boring holes in wood. They can also be used to drive screws and nuts and to brush away rust or paint. The manual drill is the most basic type, used primarily to drive screws. It has a gear drive that the user spins to rotate the bit. The auger is another type of manual drill, used for drilling through thicker wood (figure A). Its manual handle turns to rotate the bit. The electric drill is one of the most popular power tools on the market (figure B). Different models have different levels of voltage. The battery-powered drill works like an electric drill but without the cord (figure C). Most are powered by 1.2-volt nickel cadmium rechargeable batteries. Some battery-operated models come with an adapter to convert the tool to a corded electric drill (figure D). Others have a hex chuck in place of a regular chuck (figure E). The hex chuck can be removed so that bits of different sizes fit into the drill. The hammer drill has settings that permit the user to operate the tool as a conventional drill or a hammer drill (figure F). A hammer drill's bit drills and pounds at the same time. When using any kind of drill, make sure the bit enters the work piece at a 90-degree angle (figure G).
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