In order to ensure that the precision spindle bearing does not cause too much deformation after assembly, it must be done: (1) The concentricity of the shaft and the seat hole and the vertical angle of the shoulder should be specified according to the corresponding precision of the rolling bearing. (2) Not only accurately measure the interference fit of the rotating ferrule, but also accurately measure the fit fit of the fixed ferrule. The amount of interference of the rotating ferrule should also be minimized within the possible range. It is only necessary to further ensure that the thermal deformation effect at the operating temperature and the centripetal force effect at the highest speed will not cause shrinkage or rolling of the tight fit surface. The fixed ring is selected with a small clearance or clearance according to the size of the working load and the size of the bearing. Too loose or too tight is not conducive to maintaining the original accurate shape. (3) If the precision spindle bearing is running at high speed and the operating temperature is relatively high, it should be noted that the fit of the rotating ferrule should not be too loose to avoid axial force vibration, and the fit of the fixed ferrule should not have a gap. In order to avoid deformation of the ferrule under load and cause vibration. (4) The premise of using a small clearance fit for the fixed ring is that the matching surfaces have a very high shape accuracy and a small surface roughness, otherwise it will make assembly difficult and disassembly difficult. In addition, consideration must also be given to the interference of spindle thermal growth. (5) The main shaft using double row angular contact ball bearings mostly has a light load. If the fit interference is relatively large, the radial moment of its internal structure will be larger, causing adverse effects. Only when the torque is accurate can the rotation be stable!
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