Collective adjustment

This method can also be referred to as “random statistical adjustment”. Using this method, the bearings, shaft, housing, and any other components are manufactured to Normal tolerances. The components, which are considered fully interchangeable, are assembled randomly. Where tapered roller bearings are concerned, this interchangeability also extends to the inner ring assemblies and outer rings. To avoid high machining costs and the use of precision bearings, it is assumed that given the limiting values of the tolerances, it is statistically improbable that tolerance stack-up occurs. If, however, accurate preload is to be obtained with as little scatter as possible, manufacturing tolerances must be narrowed. The advantage of collective adjustment is that no inspection is required and no extra equipment is needed when mounting the bearings.
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