对称型槽成形的工件较平直。
The workpiece formed by the symmetrical trough is relatively straight.
典型的铣削夹具：图13.3所示为一用于在图示其它工序都完成的工件上铣槽的简单铣削夹具。
Typical milling fixture. Figure 13.3 illustrates a simple milling fixture for milling the slot in the otherwise completed workpiece shown.
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.
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