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Re: [TowerTalk] Bearings

To: Stan Stockton <wa5rtg@gmail.com>, "TowerTalk@contesting.com" <TowerTalk@contesting.com>
Subject: Re: [TowerTalk] Bearings
From: Grant Saviers <grants2@pacbell.net>
Date: Fri, 14 Jul 2017 10:26:26 -0700
List-post: <mailto:towertalk@contesting.com>
should say "20% of radial rating"

On 7/14/2017 10:03 AM, Grant Saviers wrote:
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@contesting.com> on behalf of Stan Stockton<wa5rtg@gmail.com>
Sent: Friday, July 14, 2017 8:55 AM
To:TowerTalk@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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