[TowerTalk] Replacement Thrust Bearing

[Patrick Greenlee]

I have a NIB 2 inch ID bearing in a 4 mounting hole pillow block with 
grease Zerk.  It is one HD unit rated for way more than needed and cost 
about $20.  The box is labeled CJ Bearings and is part number 
UCF210-31.  There are only two hams in our ZIP Code and we went together 
and bought two.  His is in use and doing fine while mine awaits the 
arrival of my repurposed prop pitch motor, SteppIR DB42, and Tash Tower 
HD LM354.

The box has this statement printed on a side panel, "Do not open until 
ready to use, keep dry and clean."  I will be assessing the 
methods/repurposed plumbing components mentioned here as used for 
protection against the environmental hazards.  I have a hard time 
understanding the rationale behind paying near or over $100 for a 
bearing very similar to mine.  Maybe if I framed and displayed a high 
dollar sales receipt from DXE or a tower company perhaps that would help 
justify the price. ;) ;)

After all, a little frog that has been hand raised, dew picked, and 
lightly killed is still just a crunchy little dead frog even if related 
processes read like the menu of a high dollar French restaurant.

Patrick   NJ5G




On 4/18/2015 11:04 PM, Roger (K8RI) on TT wrote:
> All of the new TB-3s and 4s I've tried felt very rough.  A real 
> bearing would be replaced if it were that rough, BUT the do the job 
> well. Gene's suggestion are much better bearings.  My new (used, but 
> new to me)LM470 has one of those mounted on top.  I'd suggest a cover 
> of some sort to protect it from the rain.  They get rusty looking and 
> look like crap, but continue to work well.
>
> 73
>
> Roger  (K8RI)
>
> On 4/17/2015 12:49 PM, Robert Harmon 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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>
>