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1, NSK bearings after installation in the host, such as measurement of spindle runout, but found its spin measured value is a certain change; when measured in a row, after a certain speed is identified, this change is repeated approximately. Indicator for cyclic running accuracy for measuring such changes, changing approximately the speed required to repeat on behalf of cyclic running accuracy of "cycles", measure changes in the cycle amplitude, cyclic running accuracy is poor. To properly preload of spindle, speed gradually increased to near speed to adopt NSK bearing "break-in" effect can increase the cycles of spindle running accuracy.
2, and a factory trial precision instruments, spindle with 6202/P2 type NSK bearing and its precision still cannot meet requirements, Hou plus rough axis neck and in its Shang produced roll road to instead of within ring, and will steel ball for waxy key measurement, to size size each three grain a group, each group steel ball take near 120 ° of interval separate, due to reduced has a heavy processing surface, and reduced has a heavy tie surface, while and improve has NSK bearing system of stiffness, and maximum three grain and minimum three grain steel ball of near raster distribution, Improving the rotating accuracy of axis, and meets the accuracy requirements of instruments.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32314U NTN | 70 | 150 | 51 |
| 4T-30314D NTN | 70 | 150 | 35 |