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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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General rolling characteristics
Designing a tree line
Bibliography
Websites
SNR: NTN-SNR Bearing technology http://www.ntn-snr.com/group/fr/fr-fr/index.cfm?page=/group/home/technique_roulement [page consulted on September 30, 2012]
Standards and norms
Ratings
- Vocabulaire - NF ISO 5593 - 10-07
- Symboles relatifs aux grandeurs - NF ISO 15241 - 09-12
Dimensions
- Roulements radiaux. Dimensions d'encombrement, plan général - NF ISO 15 - 09-11
- Roulements à rouleaux coniques. Système de désignation - NF ISO 10317 - 06-09
- Roulements à rouleaux coniques. Dimensions d'encombrement et désignation des séries - NF ISO 355...
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