Tom Bishop, P.E. 
EASA Technical Support Specialist
 
Much of what will be discussed in this article applies to all rolling bearings, both ball and roller. Our focus, though, will be on issues that relate mostly to ball bearings used in electric motors. The intent is to address some of the fundamentals of rolling bearing enclosures, internal clearances and fits. We deal with rolling bearings every day, but we don’t always consider some of these fundamentals until there is a bearing related problem. 

Note: Rolling bearings were previously referred to as antifriction bearings. The American Bearing Manufacturers Association (ABMA), formerly the Antifriction Bearing Manufacturers Association (AFBMA), now terms antifriction bearings as “rolling bearings.” 

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