T740K horizontal diamond boring machine is the main equipment for processing the large and small hole of the connecting rod. The accuracy of the two boring heads directly affects the quality of the connecting rod hole processing. Therefore, when replacing the boring head bearing, in addition to selecting the high-precision rolling bearing according to the regulations, it is necessary to master certain assembly techniques to achieve the goal. The front and rear supports of the boring head spindle are equipped with D-stage pairs of single-row radial thrust ball bearings, and are preloaded. The structure is shown in Figure 1. In order to ensure the accuracy requirements of the steamed bread, we made the
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