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Mashining of metals is the process of removing chips from the metal parts. This prosess includes turning, planing, shaping, drilling, boring, reaming, sawing, broaching, milling and grinding. They have been greatly developed since the development of the steam engine.
The design of a modern machine of any type reflects the latest developments of practically all the engineering industries. A horizontal milling machine may be used as an example.
The strict distinction between the operations of drilling and boring is that the first initiates a hole, while the second enlarges the one already existing. Reaming is the operation of enlarging a machined hole to an accurate size with a smooth finish. Sawing of materials is an important operation, too.
Broaching is a machining method in which one or more cutters (Broaches) with a series of teeth are pushed or pulling across a surface to machine that part to the desire shape. The broach has a number of successive teeth of increasing size which cut in a fixed path. Grinding is the only method of cutting such materials as hardened steel. Grinding is performed with a rotating abrasive wheel. Cylindrial, internal, surface and centreless grinding are common typed.

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