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.
介绍了工件退刀槽宽度小于机床退刀行程的内凹齿轮的齿形加工方法，解决了传统加工方法不易实现的难题之一。
Tooth profile machining of mid-concave gear with narrow run-out groove is introduced, which solves a difficult problem using traditional machining.
针对某S195缸套在退刀槽处断缸的问题，分析了该缸套上退刀槽处的机械应力以及机械应力与热应力的耦合结果。
To the question of fracture in the relief notch of some type 'S195cylinder, analyzing mechanical stress and coupling results of thermal stress in relief notch of some type S195 cylinder.
本文介绍了用PC改造四米龙门刨床工作台的自动循环，点动前进和点动后退，自动进刀和退刀等功能的交流控制系统。
The AC control system of the 4m planer is retrofitted with PC for table automatic cycle, jogging forward and jogging backward, automatic feed and withdraw.
本文介绍了用PC改造四米龙门刨床工作台的自动循环，点动前进和点动后退，自动进刀和退刀等功能的交流控制系统。
The AC control system of the 4m planer is retrofitted with PC for table automatic cycle, jogging forward and jogging backward, automatic feed and withdraw.
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