[TowerTalk] Mounting in the tower

[Gary R. Hosler]

I had to remove a good deal of material in order to clear the "Z" braces.  As I
indicated in my previous posting, I would not want to depend on the modified
rotor shelf to handle vertical loads.  Working with a lateral load should be no
problem.  In my case the modified shelf was there simply to stabilize the lower
end of the mast and was not taking any vertical load.  As far as removing
braces, you are on your own.  I haven't removed any braces however Rohn has one
"Z" brace missing from the top section to allow for the insertion of a rotor.  I
have seen many towers with one brace removed and no failures as a result.  The
only failure I have seen that could be attributed to this activity was where the
"Z" braces were removed from all three tower faces.  Very uncool!

de Gary  W0AW




Shane Dugas <shane@eatel.net> on 05/07/99 06:46:43 AM

To:   Gary R. Hosler/KHI/Imation@Imation
cc:   towertalk@contesting.com
Subject:  Re: [TowerTalk] Mounting in the tower






>I have an Orion 2800 mounted 8 feet down in the Rohn 25G tower at the junction
>of two sections.  The standard AS25G rotor plate works very well there.  As far
>as the section joint not being big enough to accomodate the OR2800, I'm
>confused.  I have been able to insert the rotor through the "Z" braces and
>lowered down to the mounting plate.  No braces were removed or modified.  I
also
>have a 2nd AS25G mounted about two and a half feet above the OR2800 drive plate
>that holds a thrust bearing.  This allows me to remove the OR2800 for service
>and have a lower support for the mast.  This was NOT an easy fit!


Well this is kinda weird.  I just came in from the shop where I just
realized that that the as25g doesn't fit inside a regular section of tower.
So NOW I get this message.<G>  I'm trying to do something very similar. I
have a BA25g that I'm trying to use on the top of my tower.  What I would
like to do is put a bearing on top to hold the entire load and another
bearing about 3-4 ft down into the tower.  The second shelf on the BA25G is
to close to the top shelf to use for anything so I was just going to pass
through it.  I have plenty of rotor shelf plates to use for the second
temporary bearing and another for the rotor.  I guess the question
is.........Is is safe to cut out bracing.  Is this normal practice.  I was
under the assumption that it was fairly easy to mount something inside a
regular section of tower.  If its not...why hasn't rohn addressed this
problem?  It just seems that cutting the braces off just ain't the right
thing to do.  It may be common practice for all I know.  Anyway that's my
setup.  If anyone has any better ideas I sure would appreciate it.  I've
gone through great lengths ( and a lot of money) to set this tower up to
Rohn's specs.  I sure would hate to start cutting corners now.


BTW Gary,  how much of the plate did you actually have to cut off?



Someone educate me please.


KK5LC
Shane Dugas
Prairieville, LA
Shane@eatel.net



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