OK.... now that I own a 60 foot Heights Tower, I am VERY interested in
bearings for my mast...
Currently, it has a single Yaesu at the top (6 set screws; 2 x 3 setup
using load bars to spread the load) and the mast WAS resting in an Alpha
Spid RAK...
I've not settled on the exact rotator I want to use yet, but the Big RAK
is on the list.
But, I AM convinced I'd like to use two thrust bearings: one at top and
one somewhere in the middle, and if I could find a rotator that had a
pass-through, I'd support the REST of the weight on a bearing BELOW the
rotator. Ideally, at least in my mind (tending to over-engineer
everything), I would prefer that the rotator experienced ZERO thrust
load. More than I can hope for I'm sure, but that's the "ultimate goal".
I have a 24', 2" x 1/4" aluminum mast with nearly 16 foot internal to
the tower.
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 7/15/2017 11:20 AM, Jim Thomson wrote:
> Date: Sat, 15 Jul 2017 01:56:37 -0400
> From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Bearings for Axial Load
>
> <Roller and ball bearings work well for side loads. Ball bearings in a
> <horizontal race can support substantial loads. Roller ans ball bearings
> <typically work in one axis at a tine. It takes a tapered bearing, like
> <a wheel bearing to do well on both axes.
>
> <73, Roger (K8RI)
>
> ## u sure about that ? A tapered bearing, like a wheel bearing, is designed
> to be mounted horizontal. Mount it vertical, and all the load ends up on
> the bottoms
> of those shafts that go through the tapered bearings... on the now horz
> section, that all those
> vert shafts are connected to. . Im sure it was on your site that
> depicted broken shafts..that go through the center of the tapered roller
> bearing. IF the wheel bearing was
> big enough to begin with, and 2 of them were used, it should not be an issue.
> IF the rotor in question had
> the entire weight of the mast + ants on it, then there would be no weight
> on the bearings either... only
> an axial load, when the wind blows.... moot point.
>
> ## I dont know what type of bearing the speer brand is..... thats used in
> the UST crank-ups, but they are
> built like a tank...and come with locking collars. I used 2 of em... + a
> K7NV small PP.
>
> Jim VE7RF.
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