[TowerTalk] Bearings

[Grant Saviers]

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 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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