Maybe a dry lubricant like graphite would work for the bearings
----- Original Message -----
From: "jeremy-ca" <km1h@jeremy.mv.com>
To: "Mark Robinson" <markrob@mindspring.com>; <towertalk@contesting.com>
Sent: Saturday, 25 August, 2007 2:04 PM
Subject: Re: [TowerTalk] Rohn 45 Question
> 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
>>>>
>>>>
>>>>
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