[TowerTalk] Which Thrust Bearing to Use

[Wayne Kline]

I was fortunate to have a  12" dia X 10 " tall   Teflon solid ROD   machined to fit the  Rohn AG45 top plate hole 8 inched inserted snugly in the hole with a 2" tall collar.   An 11" in dia. 1/4 thick SS plate with a 8 " tall 2.375 OD 2.065 in SS DOM tube welded over the center hole a  mast stabilizer

 with three 3/8 " SS locking  nuts welded 120 deg. apart.

 This is now on my 15 meter Tower and top beam was on another tower with a 3 element 40 meter beam. a thin film of Mobil 1  WOW

Smooth rotation .


I know this would be big $$$ to reproduce, I was lucky my Father worked at a facility that fabricated and rebuilt  Cryogenics line of liquid helium transport/storage containers


Wayne W3EA


________________________________
From: TowerTalk <towertalk-bounces at contesting.com> on behalf of charlie at thegallos.com <charlie at thegallos.com>
Sent: Friday, December 9, 2016 11:19 AM
To: jimlux
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Which Thrust Bearing to Use

<snip>
>
> Torlon is a bit pricey... $1200 for a 12x12 sheet 1/2" thick
>
> Moly filled Nylon is $37 for a 1" thick piece 6x6"  - Says it can be
> used outdoors, It's black, but that doesn't always mean it's UV resistant.
>
> Black acetal (Delrin) is $26 for the same 1"x6"x6"
<snip>

Which is why I said we don't need torlon of vespil <g>

Usually, if you are using those, you get them injection molded to shape,
unless it is a high buck one off, as they material is really priced per
oz, so as you would be removing the whole middle.  If you were in mold it,
there is much less there - but that is talking production, making molds
etc, unless you can find one of the plastics houses that offers a hat
bearing say in 2.25" ID

Done right, as the hat shaped bearing is UNDER metal, and never exposed to
UV, it'll never be an issue.  You can also use the Delrin, or even filled
delrin

Like I said, one of those applications where the fact we are using ball
bearings is just old fashioned, and today not even close to best practice.

_______________________________________________



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