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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