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。
Taking cordierite and topaz for example, the specific cone-apex Angle values are given, and the reason why the cone-apex angles are too small is analyzed.
并以堇青石和黄玉为例给出了具体的锥顶角数值大小，分析了锥顶角很小的原因。
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