Precision bearing in the process of cycle rotation, there will be poor cycle rotation accuracy, to introduce the concept of poor cycle rotation accuracy.
After the installation of the bearing in the main engine, such as measuring the radial runout of the spindle, it can be found that the measured value of each revolution has a certain change; When continuous measurement is carried out, it can be found that after a certain number of revolutions, this change will be approximately repeated. The index to measure the degree of change is the precision of cyclic rotation. The number of revolutions required for the approximate repetition of changes represents the "quasi-period" of the precision of cyclic rotation. If the magnitude change amplitude is large in the quasi-period, it means that the precision of cyclic rotation is poor.
If the spindle is properly preloaded, the speed will gradually increase to close to the working speed, in order to implement the bearing "running-in" effect, can improve the spindle cycle rotation accuracy.
