Drilling machines

Drilling machines which are used mainly for drilling holes in machine parts, are made in many different types designed for handl­ing the various classes of work.

The upright drilling machine is the type most commonly used, and the name applied to this class indicates that the general design of the machine is vertical, and also that the drill spindle is in a ver­tical position.

The radial drilling machine. — The main advantage of a radial machine is that the drill can be moved over the work to any desired position, so that a large number of holes can be drilled in the work without moving it.

The sensitive drill is a small machine of light construction, which possesses sensitive qualities which are of value in drilling holes in delicate work.

The multiple-spindle type is built in both vertical and horisontal design.

It can perform a number of operations on a component without the necessity of changing tools.

Gang Drills. — When a number of single-spindle drilling machine columns are placed side by side on a common base and have a com­mon work table, the machine is known as a gang drill. Each spindle is independently controlled as to speed and feed so that a number of operations may be performed in succession and simultaneously upon the machine. In this machine work is moved progressively from one spindle to the next.

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