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gashing
Gashing is a machining process used to rough out coarse pitched gears and sprockets. It is commonly used on worm wheels before hobbing, but also used on internal and external spur gears, bevel gears, helical gears, and gear racks. The process is performed on ''gashers'' or universal milling machines, especially in the case of worm wheels.〔 After gashing the gear or sprocket is finished via hobbing, shaping, or shaving.〔.〕
==Equipment==
''Gashers'' are large, heavy-duty machine tools. They have horizontal and vertical slideways, precise indexing, large diameter ballscrews, and spindle drive motors up to . They are usually controlled via computer numerical control (CNC) or a microprocessor. While they are usually used for rough cutting, they are also sometimes used for finishing. For example, gashers are used for the production of large roller-chain sprockets.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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