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。
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。
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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