Thread Content
When the shaft bearing adjustment amount is too large, it has a significant impact on the contact with the shims. Therefore, the scraping of the shims should be carried out simultaneously with the centering work. The center can be measured first; based on the requirements for alignment with that center, the adjustment amounts for the shims inside the 3 shims located beneath the bearing shell can be calculated. Based on the calculation results, along with the contact conditions, the gasket thickness is pre-adjusted using the estimated amount of grinding. The reserved grinding amount should not be too large; around 0.10 mm is sufficient. Since the shims are in three-point contact, raising the lower shim slightly can create a gap between the two side shims; as a result, the bearing shells will swing, and the contact points will not be accurate. Therefore, when grinding the shims, the shims on both sides should be in contact, while there can be a slight gap in the lower shim. First, grind the side shims until they are basically up to standard, and then focus on grinding the lower shims. Additionally, when grinding the shims to the final stage, attention should be paid to the amount of grinding required for the bottom shims and the side shims; generally, the number of times the bottom shims are ground should be increased to ensure that both the bottom shims and the side shims meet the requirements regarding their contact surfaces. ? Acceptance criteria for grinding shims: The contact marks should cover more than 70% of the total surface area, with the contact points being evenly distributed in a dot-like pattern ； When the rotor is not installed, 0.03 mm cannot be inserted into the shims on both sides, and 0.05 mm cannot be inserted into the shim at the bottom ； After installing the rotor, none of the shims can be inserted 0.03 mm. ?