Grinding is a machining process that uses an abrasive wheel as the cutting tool. A wide variety of machines are used for grinding. They include: hand-cranked knife-sharpening stones; handheld power tools such as angle grinders and die grinders; various kinds of expensive industrial machine tools called grinding machines; and the bench grinders often found in residential garages and basements. Grinding practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass production contexts it can also rough out large volumes of metal quite rapidly. It is usually better suited to the machining of very hard materials than is "regular" machining (that is, cutting larger chips with cutting tools such as tool bits or milling cutters), and until recent decades it was the only practical way to machine such materials as hardened steels. Compared to "regular" machining, it is usually better suited to taking very shallow cuts, such as reducing a shaft's diameter by half a thou. Technically, grinding is a subset of cutting, as grinding is a true metalcutting process.

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