Опубликовано в "Бизнес, Бизнес", язык - English. 6 страниц.
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Drilling is cutting method where a drill bit is used to make a circular cross-section in any solid material. A drill bit is a multi-point rotary cutting tool. It is attached to the machine that makes it rotate at speeds ranging from hundreds to thousands of revolutions per minute. This, when pressed against the workpiece, creates the desired hole by cutting off chips from the workpiece. Еще
