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Thanks for the link to the Timpken Engineering Manual. It was very
informative. All these years I had thought that bearings should have
a tiny bit of end-play to allow for thermal expansion, but Timken
says that's not true. On Pg. 82 they state:
"Generally, the ideal operating bearing setting is near
zero to
maximize bearing life (fig. 83). Most bearings are set with
endplay
at assembly to reach the desired near-zero setting at operating
temperature.
There is an ideal bearing setting value for every application. To
achieve this condition, the bearing setting must take into account
deflection under load (radial + axial) as well as thermal
expansions
and material used.
Figure 83 indicates that bearings have a longer life with a small
pre-load. Live and learn. I guess the only way to set the end play
accurately would be with a dial indicator so I just ordered one from
Amazon for $25. One would have to test the end play cold and then
hot.
So maybe my problem all along was the right brake locking up and not
the tightness of the bearings (or both)????
John,
A little pre-load is actually beneficial in roller bearings.
You apparently had a too much on one wheel.
I re-grease my bearings every year and during installation
tighten the nut until I get just under one revolution of spin.
It is a good idea to re-check this after a few hours of use.
Chris Zavatson
N91CZ
360std
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