[TowerTalk] Bearings for Axial Load

Roger (K8RI) on TT K8RI-on-TowerTalk at tm.net
Sat Jul 15 22:54:07 EDT 2017

With two thrust bearings it may be possible to build tension between the 
bearings if both are clamped tight to the mast.

73, Roger (K8RI)

On 7/15/2017 Saturday 3:31 PM, Clay Autery wrote:
> 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 at tm.net>
>> To: towertalk at 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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Roger (K8RI)

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