Single row angular contact ball bearings can only bear axial load in one direction, therefore, during installation or disassembly, attention must be paid to the direction of bearing force. For assembled bearings, the position of the preload gap is different when back-to-back and face-to-face installation, so pay attention to the compression position of the bearing set. In addition, in order to ensure the rotation accuracy of the main shaft assembly, it is recommended to adopt the installation method of directional assembly as much as possible when installing the precision bearing. Precision angular contact ball bearings are marked with the highest points of radial runout of the inner ring and radial runout of the outer ring on the end faces of the inner ring and outer ring respectively. When installing the bearings, first align the highest point of radial runout of the inner ring and the highest point of radial runout of the outer ring of the same group of bearings in the axial direction, and then adjust the circumferential position of the bearing group when installing it on the main shaft or bearing seat , so that the highest point of the radial runout of the bearing inner ring and the highest point of the radial runout of the spindle journal are in a state of symmetry in the radial direction. Similarly, the highest point of the radial runout of the outer ring of the bearing and the highest point of the radial runout of the bearing seat are in a symmetrical state in the radial direction, and finally the bearing group is preloaded according to the design.  

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