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Fretting?

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I have seen evidence of fretting on both ends of a shaker motor shaft. (Eccentric counterweight wheels) This was on the surfaces under taperlock bushings that were apparently tight. There was a salt atmosphere. what causes this phenomena?
Ron Jacobson
 
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I believe the cause is very minute movement between the two mating parts. Even though the joint may be tight, some movement can occur, such as twisting in the driving shaft. I don't know how to solve it, but if the joint stays tight between rebuilds, I would ignore it.
 
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Agree, suspect the fit was not tight. If remachining taper is not in the plan, try a structural shimming compound like "Dynamold M-26", make shure to use a release film on one surface.
 
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