When the factory modified the 50B-11 fan, the main shaft of the fan impeller was inlaid. Due to the inaccurate calculation of the inner and outer dimensions of the pre-sleeve, the hole size of the bushing was too poor. The inner hole size of the bushing was 0.08mm. The impeller can not be assembled. If the machine is reworked, the diameter of the impeller is 1.5m. The machining of the large surface of the workpiece and the hole of the sleeve hole is very small (0.08mm). It is difficult to rework the rework. If the reaming is used, the sleeve is reamed.
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