In a message dated 10/13/2011 4:19:33 P.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I've seen this grease/no grease thread for years and never gave it much
thought. But, I now have to wonder why anyone would design a bearing with
an aluminum body/race ? The reason I say this is that I took down a tower
several years ago that had a TH6DXX on a TB3. The system had been idle for
several years with the antenna rocking back and forth the whole time. Even
tho the brake on HAM-M was set there's still some movement. As a result,
the bearings ground into the race and dug out pot holes to the point that
the bearing would not turn at all.
Yep. That's what happens when you have soft aluminum races and hard
steel ball bearings. A good reason to exercise the rotator once in awhile and
not always leave the antenna parked at the same heading.
Cheers,
Steve K7LXC
TOWER TECH
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