Introduces a precise method of import bearings NMB improve accuracy

Analysis of import bearings NMB improve the precision of the precise method to improve the accuracy of precision imported bearings NMB: 1. Imported bearing in the host after the installation, such as the measurement of spindle radial runout, can find its each turn of measuring value has a certain change; Continuous measurement, can be found that after a certain number of revolution, this change will approximately duplicated. Measure for cyclic rotation accuracy degree of the change, change the approximately duplicated the revolution, on behalf of cyclic rotation accuracy 'cycle', the value of the amplitude changed in quasi cycle, is the cycle rotation accuracy is poor. Such as the proper preload on the spindle, the higher speed step by step to near work speed, on bearing the 'break-in' effect, can improve the circulation of the spindle rotation accuracy. 2. Manufacture precision instruments in one power plant, the type 6202 / P2 bearing spindle and its precision is still cannot meet the requirements, the bold shaft neck and on the race to replace the inner ring, and the steel ball, the measurement of waxy secret, to size every three grain of a group, each group of steel ball are separated pick up close to 120 °, due to reduced a heavy processing surface, reduce the heavy blend surface, at the same time improve the axial stiffness of the bearing system, and the three largest grain and minimum three grain of steel ball nearly equidistant distribution, and improves the precision of drive shaft rotation, thus satisfying the requirements of the precision of the instrument.