Jasper Fisher 
Rexel Motor Repair 
Alton, Illinois 
Technical Education Committee Member 

Like most maintenance and repair tasks, a successful outcome is gen­erally predicated on good planning and preparation. The first steps in the process are often the most critical. 
When preparing to remove a shaft from an armature (Figure 1) or rotor core (Figure 2), first measure and record the location dimensions of all shaft-mounted components. This in­
cludes materials such as bearing spacer collars, flingers, and removable cool­ing fans and the shaft-to-core location dimensions. 

A common reference measurement is from the outer edge of the lamina­tion stack to a bearing journal shoulder and/or the shaft extension end. These location measurements should be made to 1/32” +/-1/64” (0.8 mm +/-0.4 mm) (or better) and be permanently recorded in the job record. 

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