The results show that half-apex angle has a great effect on sheet thickness distribution, the smaller the half-apex angle is, the bigger the sheet thickness thins;
结果表明，半顶角对制件厚度变化起主导作用，其值越小，厚度减薄越严重；
Rotating the disc of the compound rest with an angle equal to half the apex angle of the cone.
将复式刀架盘旋转一个等于圆锥体顶角一半的角度。通过摇动复式刀架操纵柄手动提供进给。
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