采用带有防尘盖的向心球轴承与锥度心轴组成的简便顶尖(附图α),插入车床尾座架锥孔后,可加工空心轴类工件。顶住工件已加工过的内孔来车削外圆。使用时顶尖旋转灵活,加工质量好。比过去用圆塞套在顶尖上的方法提高了效率,方便了操作。用专用心轴将轴承压紧,外圆磨到工件内孔所需尺寸。轴承2的外圆磨有适当锥度,以适应公差范 The use of a dust cover with radial ball bearings and taper mandrel simple axis (Figure α), insert the lathe tailstock taper hole, the hollow shaft can be processed workpiece. Overturn the cylindrical surface against the machined hole in the workpiece. Top rotation flexibility when used, processing quality. Than in the past with a circular plug on the top of the method to improve efficiency and ease of operation. With a special mandrel bearing compression, cylindrical grinding to the required size of the workpiece bore. Bearing 2 cylindrical grinding with appropriate taper, to accommodate tolerances