[TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

Steve, NR4M steve at nr4m.com
Mon Mar 11 08:33:56 EDT 2019


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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