[TowerTalk] Bearings

[Grant Saviers]

I think the wiki advice is limited to deep groove ball bearings and is 
consistent with what I've seen in bearing catalogs i.e.  ~20% of axial 
rating is ok for thrust in the size ball bearings I'm familiar with (<2" 
bore).

A spherical roller is designed to withstand angular shaft misalignment 
or deflection which would occur when the tower leans a bit under heavy 
load.  OTOH, the top row of rollers aren't useful since all the load is 
downward.  A deep groove ball bearing can't take much angular shaft 
misalignment.  There are thrust spherical roller bearings with specified 
radial loads.  They are in the SKF web site catalog.  However, I suspect 
the bearing RTS uses is much more common, cheaper, is already mounted, 
and has Chinese knockoffs available.

I have to wonder if a spherical plain sleeve bearing might be a better 
choice since brinelling and fretting aren't a problem, but I've not 
looked at the specs.
https://en.wikipedia.org/wiki/Brinelling

Best to contact the manufacturer for the capacity of the bearing you 
want to use.

Grant KZ1W

On 7/14/2017 6:30 AM, Al Kozakiewicz wrote:
> https://en.wikipedia.org/wiki/Ball_bearing#Direction_of_load
>
> ________________________________________
> From: TowerTalk<towertalk-bounces at contesting.com>  on behalf of Stan Stockton<wa5rtg at gmail.com>
> Sent: Friday, July 14, 2017 8:55 AM
> To:TowerTalk at contesting.com
> Subject: [TowerTalk] Bearings
>
> I need an education on bearings.  The question is the axial or thrust rating of guesstimate thereof on bearings that do not show that spec.  As example the bearing I believe used on a RTS rotating tower is a ZF 5215S made by Rexnard I think.  The radial load is specified at greater than 50,000 pounds. Axial load is not specified.  Is there anyway to equate radial load to axial load other than to look at a bearing and say "looks like it would handle a lot?"
>
> Stan, K5GO
>
> Sent from Stan's IPhone
>
>
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