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.
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.
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