退刀，进给运动结束后，加工工具与工件相互离开的过程。
数控系统还必须计算进刀和退刀，以及加速度和减速度。
The control also must calculate approach and escape motions as well as acceleration and deceleration.
对零件的工艺结构，如小圆角、倒角、退刀槽等可省略不画。
In assembly drawings, certain technical structures, such as round, chamfer, and undercut can be omitted.
它传动结构简单，调速方便；退刀速度快，不需手动，退刀弹簧不易损坏。
The drive structure is simple, the speed adjusting is convenient, the knife withdrawing speed is fast, hand motion is not needed, and the knife withdrawing spring is not easy to be damaged.
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