属机械法对中心，可以磨削中等精度光学零件的外圆或端面。
The center is a mechanical method, can moderate precision grinding of optical parts of the cylindrical or end.
或为设在电机壳体侧壁或端面上对应于轴承部位的圆形或方形注油孔。
Alternatively, the oil injection hole is the round or square oil injection hole which is arranged at the positions of the side wall or end surface of the motor shell corresponding to the bearing.
在端面车削操作中，进给由横向滑板提供，而切削深度则通过大拖板或复式刀架控制。
During a facing operation, feed is provided by the cross slide, whereas the depth of cut is controlled by the carriage or compound rest.
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