Barn Door rails and will come in diffrent sizes. Ive seen some track and
wheels at tractor supply.
Large bay doors on qonset hut building have large wills and track too.
Jack
KZ4USA
Bradenton, Florida
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
To: "Stan Stockton" <k5go@cycle-24.com>; "Tower and HF antenna construction
topics." <towertalk@contesting.com>
Sent: Sunday, March 28, 2010 1:31 AM
Subject: Re: [TowerTalk] Homebrew Crank-up
>
>
> Stan Stockton wrote:
>> Anyone have an ideas regarding rails, rollers, general set-up, etc.
> I don't remember where I saw them used but it was not an uncommon use.
> They were pulleys/wheels that ran on pipe. They were deeply dished so
> the rim reached to the 90 degree point on each side of the pipe. These
> also supported substantial weight as in quite a few tons. I just wish I
> could remember what I saw them being used on. It may have been an
> overhead crane, or possibly cargo unloader...I just don't remember.I
> guess they could be thought of as double sided trolley wheels where each
> one prevents lateral movement.
>
> The wheels could be mounted either on the outside or inside tower with
> the "tube rails" being opposed, but I like this arrangement better than
> rails and rollers in the general sense.
>
> Going beyond that I'm assuming you have worked out whether temporary
> guys will be needed for the base and/or top when extended which might or
> might not extend the amount of wind it could tolerate during the short
> periods of use.
>
> Were it me and it's not, I'd leave at least one full section of the top
> into the base when fully extended and I'd add a locking and bracing
> mechanism that would extend to eliminate any side play of the top
> section in the base while extended. in addition to what ever locks it in
> place, or prevents it from falling back down.
>> that could be used for about 75 feet of 55G or 65G that would telescope
>> into about the same length of larger tower (33 inch face, 3 inch legs),
>> probably using an extra large prop pitch to raise and lower for 48 hours
>> a few times a year dependent on good weather :-) ?
>>
> As for the prop pitch motor, some of the older ones properly geared
> certainly could do the job, but regardless of what you use I'd want some
> thing with readily available parts, or a spare unit on hand that could
> easily and quickly be interchanged with the other. One thought is a
> winch like they use on the front of 4 wheelers when "mudding".
>
> Good luck in what ever use you put it.
>
> 73
>
> Roger (K8RI)
>> Thanks...Stan, K5GO
>> _______________________________________________
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