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Re: [TowerTalk] Rohn 45 Question

To: "Mark Robinson" <markrob@mindspring.com>,<towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn 45 Question
From: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 25 Aug 2007 14:04:30 -0400
List-post: <mailto:towertalk@contesting.com>
Use a short length of mast and let it all float until it is aligned perfect. 
The holes for the lower bearing should be slightly oversize for alignment. I 
use a digital level for that last tiny bit. In the past Ive had someone on 
the ground with a good transit which I also use when erecting a tower.

The TB bearings have plenty of slop which can give a false feeling. Used 
ones often are well and unevenly grooved in the race; many years ago there 
were discussions on lubricating them before installing.

Carl
KM1H


----- Original Message ----- 
From: "Mark Robinson" <markrob@mindspring.com>
To: "jeremy-ca" <km1h@jeremy.mv.com>; <K7LXC@aol.com>; 
<towertalk@contesting.com>; <john@kk9a.com>
Sent: Saturday, August 25, 2007 1:06 PM
Subject: Re: [TowerTalk] Rohn 45 Question


> How do you avoid binding? Can you let the bearings float and self align 
> before tightening the housing down or is their a better method.
>
> Mark N1UK G3ZZM
>
>
> ----- Original Message ----- 
> From: "jeremy-ca" <km1h@jeremy.mv.com>
> To: <K7LXC@aol.com>; <towertalk@contesting.com>; <john@kk9a.com>
> Sent: Saturday, 25 August, 2007 1:00 PM
> Subject: Re: [TowerTalk] Rohn 45 Question
>
>
>> Thats strange. Numerous YCCC and other serious contesters/DXers with big
>> stacked arrays have been using dual bearings for decades with a 
>> significant
>> reduction in rotator failures.
>>
>> Setting up a dual bearing installation is quite simple if you pay 
>> attention
>> to what you are doing, even when using a Tailtwister. Other rotators are
>> much easier. My current setup on 3 towers uses Orion, Create and 
>> Tailtwister
>> rotators. Binding just doesnt happen.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: <K7LXC@aol.com>
>> To: <towertalk@contesting.com>; <john@kk9a.com>
>> Sent: Saturday, August 25, 2007 12:09 PM
>> Subject: Re: [TowerTalk] Rohn 45 Question
>>
>>
>>>
>>> In a message dated 8/25/2007 9:02:02 A.M. Pacific Daylight Time,
>>> towertalk-request@contesting.com writes:
>>>
>>>>  Personally I see no reason for a second bearing and I see a  huge
>>>> headache
>>> trying to line up a top bearing, middle bearing and a  rotator on
>>> something
>>> built as unprecise as the Rohn mounting plates.   Your rotator already 
>>> has
>>> thrust bearings and it should easily accommodate  the side forces at the
>>> bottom of the mast if it's properly  sized.
>>>
>>>    I totally agree. The reason for an intermediate  plate/bearing is to
>>> hold
>>> the mast in case of a rotor swap. That's it. The  accessory shelf 
>>> already
>>> has
>>> a hole in the middle that'll do just that so the  additional TB is
>>> unnecessarily redundant and a waste of money.
>>>
>>>    Tower parts are not precision items. You take a  chance on additional
>>> bind when trying to line up the rotator and 2 TBs. It's  sometimes
>>> challenging
>>> enough just to get the bind out with one TB.
>>>
>>> Cheers,
>>> Steve     K7LXC
>>> TOWER TECH
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ************************************** Get a sneak peek of the all-new 
>>> AOL
>>> at
>>> http://discover.aol.com/memed/aolcom30tour
>>> _______________________________________________
>>>
>>>
>>>
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>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>
>> _______________________________________________
>>
>>
>>
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>
> 

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