Use of self-lubricating copper sleeves Case 1: Shaft machining has a characteristic, the middle diameter is large, and it is continuously decreasing toward both ends or one end. Because only such parts can be put one by one. However, in some cases it is necessary to use a larger diameter on a certain step, and the sleeve can be used. This satisfies the requirements of use and also meets the assembly requirements of the shaft.

Use self-lubricating copper sleeves. Case 2: A certain shape of the shaft needs to be processed with more complicated shapes, such as a spiral oil groove. At this time, firstly processing the more complicated features on the sleeve and assembling it on the shaft can greatly simplify the processing difficulty of the shaft to reduce the cost.