Under dry cutting state, tool life is affected mostly by cutting depth.
在干切状态下，切削深度对刀具寿命影响最大。
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）。
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）。
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