[TowerTalk] Replacement Thrust Bearing

[Roger (K8RI) on TT]

As my rotator is designed to run with a vertical load as are all the ham 
series that I know of.   I use the screws for alignment but never 
tighten them unless removing the rotator.On 4/17/2015 4:03 PM, Stan 
Stockton wrote:

73

Roger (K8RI)


> I've used these self aligning bearings similar to this for 40 years with very large antennas and have never had an issue.  I have had issues with official thrust bearings like TB3.  I usually put a heavy duty muffler clamp between the top of the bearing and the antenna as I don't trust the set screws.
>
> http://www.bearingson.com/category/4-bolt_flanges/cast_iron_4-bolt_flanges/ucf_series/2_4-bolt_flange_bearings_ucf_210-32.asp?page=2&SortType=0
>
> I have never bought from this company but they are probably all alike in that price range and made in China.
>
> I think I might buy the 2-1/16 one instead for a two inch mast.
>
> 73...Stan, K5GO
>
> Sent from my iPad
>
>> On Apr 17, 2015, at 11:49 AM, Robert Harmon <k6uj at pacbell.net> wrote:
>>
>>
>> I am overhauling my rotator and thought it would be good to replace my thrust bearing also.
>> I have the Rohn TB3 bearing now.  It has been in use for 18 years and feels pretty rough.
>> Im thinking of going with a different bearing this time with a steel body and greased. (grease fitting)
>> Looked thru the archives on tower talk to find out what others have used and can’t find much,
>> on this type of replacement and I know the bearing supply houses have them, just haven’t
>> pursued searching with them yet.   I would like to know what others have used.
>> If you have used a thrust bearing like this,  could you share
>> the number and supplier ?  Array Solutions has their model TB2 which is this type
>> of bearing but it only has a two hole flange for mounting.  They have a larger unit with a 4 hole
>> flange but it is for a larger diameter mast than 2 inch. I want a 4 hole flange but for 2 inch.
>> Here is the info from their webpage:   https://www.arraysolutions.com/Products/thrustbearing.htm
>> Anyway, what say you ?
>>
>>
>> thanks,
>> Bob
>> K6UJ
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-- 

73

Roger (K8RI)


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