The vibration data captured and used for determination and validation is composed from four different defects states of the REB -outer raceway defect inner raceway defect ball defect and combination of the bearing elements defect- and one representing normal state of the bearing for four different running speeds with two load levels.
The balls are measured with very accurate machinery to determine if they meet the required tolerances. For instance the Anti-Friction Bearing Manufacturers Association AFBMA has a set of grades for bearing balls. A grade three ball has to be spherical within 3 millionths of an inch and the diameter must be accurate within 30 millionths of an
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BEARINGS Identitging and correcting causes of bearing faihue. Precision ball bearings are designed to have a long and useful Ii€e. Assuming the appli ion is correct to begin with maximizing longevity means bearings must be properly installed lubri ed and maintained. Poor operating environments. oarticularlv moist or contaminated areas.
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