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FAG bearing in the host after the completion of installation, such as measuring FAG bearing spindle radial runout, can find its each turn of the measuring value has certain change; Continuous measurement, can be found after a certain number of revolution, this change will approximately repeated. Measure the change degree of index for cycle rotation accuracy, change approximately repeated the revolution representative cycle rotation accuracy "quasi cycle", in quasi cycle of the change of amplitude, is the cycle running accuracy difference.
Make the FAG bearing spindle proper preload, which will speed escalate to close to the working speed, in order to implement bearing "break-in" effect, can improve the cycle of spindle rotation accuracy.
A factory develops precision instruments, spindle is with 6202 / P2 type bearing and its precision still can not meet the requirements, then overstriking journal and the production of raceway instead of inner ring, and the ball for precision measurement to size every three grain of a group, each group of ball take close to 120 °, the separated due to reduced a heavy processing surface, and reduces the heavy with surface, and at the same time improve the shaft a bearing system stiffness, and the biggest three grain and minimum three grain ball close interval distribution, and also to improve the shaft rotary accuracy, and meet the accuracy requirement of the instrument.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 6819NR NSK | 95 | 120 | 13 |
| 6318NR NSK | 90 | 190 | 43 |