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Article | REF: BM5370 V1

Rolling bearings - Various types and layouts

Authors: Michel MORET,  Pascal GUAY

Publication date: April 10, 2013, Review date: April 12, 2021 | Lire en français

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    2. General rolling characteristics

    2.1 Functional tolerances

    In addition to dimensional tolerances, ISO 492 also defines functional tolerances which guarantee rotational precision (table 1 ). Runout is measured by placing the dial gauge radially. It reflects a lack of circularity in the raceway of the ring being measured. Wobble is measured by positioning the dial gauge axially. On a pair of preloaded bearings, the combination of runout defects on the 4 rings results in a conical motion defect during rotation.

    Inner ring out-of-roundness and out-of-roundness are measured by rotating the inner ring only.

    The out-of-round and out-of-round of the outer ring are measured by rotating the outer ring only.

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