I am finishing up 100 foot Rohn 45. I have a 7 foot flat top section. I
have one TB-3 Thrust bearing on top and one 3 feet down and a Yaesu
G-1000DXA at the bottom. I will set the mast in the rotor and align with
top TB-3 and let the TB-3 in the middle float until I am sure all is well.
If this is not the way, I am open for suggestions.
Ron K4WZ
----- 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
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>>> _______________________________________________
>>>
>>>
>>>
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>>
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