Cheap-compressors.com

Drills

A Drill is a tool used to create a hole, usually in some hard substance, by its rotary or hammering action. A drill consists of many different tools. The awl is a pointed instrument used for piercing small holes. The gimlet, which consists of a cross handle holding a metal shaft with a screw point, is used for boring small holes. The gimlet was used in ancient times, but the tools were much improved in the middle Ages. More elaborate types of drills are composed of two main parts: a replaceable device that does the actual cutting, called a bit, and a second device that drives it. Both devices may be referred to as drills.

There are many types of drills like the hand drill, which is included in the Hand-powered rotary driving devices. Motor-powered rotary driving devices include the drill press and the portable electric drill, both used at home or in industry for cutting holes in such materials as metal, wood, and plastic. The core drill cuts an annular hole through minerals. One special kind of drill, the fusion drill, creates a hole by melting or flaking minerals with an oxyacetylene torch.