And cut it through the center so you can replace it without taking anything
down. Just take off the two pieces and replace them. Make several of them
while you have the stuff and measurements handy and put them someplace where
you won't lose them, haha.
73, Jim
----- Original Message -----
From: "Clint Talmadge" <unclebudd@bellsouth.net>
To: <ersmar@verizon.net>; "Rob Frohne" <frohro@wwc.edu>;
<towertalk@contesting.com>
Sent: Wednesday, March 21, 2007 6:02 PM
Subject: Re: [TowerTalk] Inexpensive thrust bearing?
> The Amateur Block was actually Phenolic. I would not use wood, as wood
absorbs moisture and swells. That might put the "squeeze" on the mast and
bind the rotor.
>
> An idea: Go to WallyWorld and get a plastic cutting board as thick as you
can find. Cut it into pieces that will fit the top plate of the tower. Bolt
the pieces together with flat head bolts so the heads will not interfere
with the top plate, while the nuts will stick up in the air bothering
nothing. Drill the mounting and mast holes and use it. The plastic will not
retain moisture and will provide a smooth inner surface against which the
mast can turn. The only "yahbut!" to the whole procedure is that the plastic
may degrade in the sun.
>
> Just an idea..
> Clint - W5CPT
>
> ----- Original Message -----
> From: ersmar@verizon.net
> To: Rob Frohne ; towertalk@contesting.com
> Sent: Wednesday, March 21, 2007 11:35 AM
> Subject: Re: [TowerTalk] Inexpensive thrust bearing?
>
>
> Rob:
>
> Use a block of wood. My Rohn catalog from ca 1987 carried a thing
they called an Amateur Block (P/N AB) that was intended to be bolted onto a
flat top plate. It was nothing more than a block of wood with an
appropriate hole for a mast drilled through it. IIRC it might have even
been split through the diameter of the hole to allow for some slop in its
fit around the mast.
>
>
> 73 de
> Gene Smar AD3F
>
> From: Rob Frohne <frohro@wwc.edu>
> Date: 2007/03/21 Wed PM 12:06:59 CDT
> To: towertalk@contesting.com
> Subject: [TowerTalk] Inexpensive thrust bearing?
>
> Hi Everyone,
>
> Does anyone have a source for an inexpensive thrust bearing? I have a
> plate on the top of my tower with a hole through it, and was thinking of
> putting a thrust bearing on, but the ones I found were around $50 which
> for my frugal self is a bit spendy for a thrust bearing. It seems that
> there is probably a cheaper way to do this with some kind of automobile
> bearing or a sleeve of pipe and some set screws, etc. Does anyone have
> any advice?
>
> 73,
>
> Rob, KL7NA
> --
> Rob Frohne, Ph.D., P.E.
> E.F. Cross School of Engineering
> Walla Walla College
> 100 SW 4th Street
> College Place, WA 99324
> (509) 527-2075
> http://www.wwc.edu/~frohro/
>
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