Thee three factors of cutting include cutting speed, feed and the depth of cut.
切削用量三要素包括切削速度、进给量和（或叫吃刀量）。
Depth of cut, d, is the normal distance between the unmachined surface and the machined surface.
切削深度d是未加工面与已加工面之间的垂直距离。
Early machine tools were operated by craftsmen who decided many variables such as speeds, feeds, and depth of cut, etc.
老式机床通常是由工人操作并由他们决定机床速度、进给量、切削深度等。
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