[TowerTalk] Bearings for Axial Load

Roger (K8RI) on TT K8RI-on-TowerTalk at tm.net
Sat Jul 15 22:32:34 EDT 2017

I'm not a mechanical engineer, but pretty sure. Those bearings receive a 
substantial load, not only on both axes, (cornering) but off axis as 
well. (momentary or short term impacts).  The race is not only tilted, 
but tapered so those rollers support load along their entire lengths.  
Note, the race taper is roughly 20 degrees off horizontal as the 
primary, long term is horizontal, while short term (but substantial) 
loads are mainly, or close to, in line with the axles although impacts 
may be at almost any angle off the rims.

73, Roger (K8RI)

On 7/15/2017 Saturday 12:20 PM, 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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