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Machining is the process by which metal is formed into a desired shape and size with great accuracy. Power-driven machines are used to cut, shave, grind, or drill the metal into prescribed dimensions, so that separate pieces may be easily assembled into the complete product. Before the metal can be fed into the machines, however, it must be marked with machining directions so that a machinist or a machine operator can perform the proper operations. This important preliminary work is the task of the layout worker.