切削速度只有在对表面粗糙度不做要求的时候才不重要。
Cutting speed only in the surface roughness not required when it is not important.
切削用量三要素包括切削速度、进给量和（或叫吃刀量）。
Thee three factors of cutting include cutting speed, feed and the depth of cut.
正确的选择切削速度对所有金属的切割操作成本都有有很大的影响。
The selection of the correct cutting speed has an important bearing on the economics of all metal cutting operations.
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