[TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

[Jim]

Steve...

I had no issue with my 2" chrome molly mast. But the gallivanting is not 
very heavy on it. Now its up with a short 2" OD aluminum mast. Fit fine.

When I first up it up in 1990, I used 2" schedule 80 black pipe. Which 
is not 2" od. More like 1-7/8 OD.

As Stan suggested, use a 2-1/8" bearing if your worried about it.

I would suggest using hex head "set" screws. Rather than the Allen head 
ones they ship with.


Thanks
73
Jim W7RY

On 3/11/2019 7:33 AM, Steve, NR4M wrote:
> Jim,
>
> How is the fit on the ID?
>
> So, many of this type of bearing will not work due to the tight tolerances. A mast that’s been galvanized usually will not fit.
>
> 73 de Steve, NR4M
>
> Sent from my iPhone
>
>> On Mar 11, 2019, at 8:23 AM, Jim <jimw7ry at gmail.com> wrote:
>>
>> This is what I have used for 30 years. Same bearing on 4 different towers in various locations. In Southwest Washington, we got 70" of rain per year. Held up fine.
>>
>>
>> https://www.ebay.com/itm/UCF211-32-2-Square-4-Bolt-Flange-Bearing/362153741170?hash=item54520b8b72:g:a2QAAOSwnTdaA6IQ
>>
>>
>> I do put a cover over the top of it with a vent pipe roof jack (just the rubber part) to keep water out.
>>
>>
>> Thanks
>> 73
>> Jim W7RY
>>
>>> On 3/10/2019 10:32 PM, Tim Duffy wrote:
>>> Best bearing - can take lots of weight.
>>>
>>> https://www.dxengineering.com/parts/dxe-tb-300
>>>
>>> Very different from the Rohn
>>>
>>> 73
>>> Tim K3LR
>>>
>>> -----Original Message-----
>>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
>>> Patrick
>>> Sent: Sunday, March 10, 2019 12:20 PM
>>> To: towertalk at contesting.com
>>> Subject: Re: [TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor
>>>
>>> I'd double check the need for a down thrust bearing to relieve the
>>> weight from the PP unit. Kurt Andress the preeminent PP re-purpose guru
>>> advised me against it.
>>>
>>> Patrick        NJ5G
>>>
>>>
>>>> On 3/10/2019 10:16 AM, Mike wrote:
>>>> Hello,
>>>>
>>>> What have others used to take the weight off of a tower mounted prop pitch
>>>> rotor?
>>>>
>>>> Presently, in the final stage of modifying a rescued prop pitch and,
>>>> unfortunately,  it didn't have the triangle bearing plate.  Plan to use a
>>>> couple of Rohn TB3 thrust bearings, one at top of the tower and the other
>>>> approx. 2 ft below the top, but wanted to find out what others
>>> successfully
>>>> have used to keep the weight off prop pitch rotors.
>>>>
>>>> The load will consist of a 2" dia. X 1/4" wall X 21 ft chrome molly mast
>>>> plus a homemade 40 m Moxon (approx. 70 lbs) and a 4 el SteppIR (approx. 50
>>>> lbs).
>>>>
>>>> I've review the TT archive for thrust bearings for possible application
>>>> with a prop pitch rotor without any consensus on what to use other than
>>> the
>>>> available thrust bearings are not reliable in the long run.
>>>>
>>>>     73,
>>>>     Mike, K4GMH
>>>> _______________________________________________
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