How to solve the problem of poor roundness of inner diameter of thin-walled bearing?
If the bearing inner and outer rings are not rigid, they will deform together with the fittings. If the roundness of the matching journal and the seat hole is controlled, the bearing will become round after assembly. To exaggerate, it's like putting a rubber band on the shaft, and whether it turns depends on the shaft. If the fitting is not round, the bearing will be deformed if it is round again.