[TowerTalk] US Tower TB-2US bearing

[K0FF]

Hold on fellows, you got this all wrong. The set screw is there to keep the
bearing collar from TURNING only. It holds zero weight.The set screw
tightens on the bearing, not the mast when properly installed.  Look at the
collar carefully and you will see that the hole in the center is not in the
middle. That's an offset cam. Put the collar on and seat it all the way
down, then ROTATE it until the offset squeezes the mast very tightly, and
pound it a little with a pin punch stuck into that partial hole. This will
hold up tons of weight. Then simply tighten the set screw a little, just to
keep the cam from rotating. Be safe!

George, K0FF
-----Original Message-----
From: Chuck Kresge <du3nxe@mozcom.com>
To: towertalk@contesting.com <towertalk@contesting.com>
Date: Sunday, June 04, 2000 11:31 PM
Subject: [TowerTalk] US Tower TB-2US bearing


>
>Has anyone purchased and installed a TB-2US thrust bearing from US Tower?
If
>so, I would like to know the configuration of the bearing collar that
>attaches to the mast that you received.
>
>I recently received a TX-455 55 foot crankup tower with a TB-2US bearing
>installed. The collar was attached at the top of the tower with a metal
>strap. An Allen wrench was also attached. The collar had ONE 5/16" Allen
set
>screw installed. 90 degrees from the screw was a hole approximately 17/64"
>size drilled into the collar about 1/4", which is about halfway through the
>collar.
>
>Unless the laws of physics have been modified, that single 5/16" set screw
>is not going to be adequate to support the weight of my 15 foot mast and
>WARC-7 yagi and EF-140S 40 meter rotatable dipole! It appeared that the
>collar had been incompletely machined and it was intended the collar have 4
>set screws installed.
>
>Numerous email messages to US Tower explaining my problem with the bearing
>collar have gone unanswered. I suspect they figured my tower was the place
>to unload this useless bearing since it was going to be shipped to the
>Philippines where the recipient might not be astute enough to realize he
>received a faulty bearing.
>
>Very discouraging. But fortunately for me I have a spare YAESU GS-065
thrust
>bearing which I will install in place of the TB-2US bearing. After two more
>weeks the cement of my foundation will be cured and I will raise the tower.
>I hope it does not have any defects like the thrust bearing.
>
>Chuck Kresge-DU3NXE du3nxe@mozcom.com
>
>
>
>
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>


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