In the absence of any formal analysis of this issue, we are just going to
have to agree to disagree. Until that is done, it's all anecdotal evidence
and becomes just a matter of opinion. By the way, years ago there was a
member of this list who was a Timken bearing engineer. He agreed that the
purpose of the spacer and shims was only to pre-load the bearings more
precisely and remove the inherent free play that allows the bearings to be
assembled.
Any inspection (Magnaflux, fluorescent penetrant, or X-ray) for cracks in
the stub axle should be done before the surface is shot peened. Shot
peening is done to cause compressive stresses in the surface and a little
below the surface. This effectively strengthens the part because tensile
stresses that lead to cracking must overcome the compressive stresses before
the tensiles have any effect. It doesn't make a lot of sense to shot peen
an item that already has cracks.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
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