套筒两端轴承挡内孔的加工，因涉及两次装夹，必须以外圆精确定位。
Concerning two fixings of the processing of the minor hole of the sleeve, the external circle must be precisely located.
外圆磨床尾架套筒的伸缩要求灵活、无阻滞现象。
It will be required quick and no step appearance that stretch out and draw back of the cylindrical grinder's fail rack sleeve.
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