On 1/15/2014 4:55 PM, Ralph Mowery wrote:
While on the subject of tower bolts, why does Rohn 25g tower use two
differant size bolts on the legs ?



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Obviously none of the respondents have had to mate two obstinate
sections of Rohn 25g together.

The smaller hole is for a drift to force the sections into alignment so
the larger bolt can be installed. Then you have an empty hole just right
for a smaller bolt. I suppose it adds a little strength to the joint,
but not much.

Paul, KD7HB

"Paul Drahn" wrote in message
...
On 1/15/2014 4:55 PM, Ralph Mowery wrote:
While on the subject of tower bolts, why does Rohn 25g tower use two
differant size bolts on the legs ?

Obviously none of the respondents have had to mate two obstinate sections
of Rohn 25g together.

The smaller hole is for a drift to force the sections into alignment so
the larger bolt can be installed. Then you have an empty hole just right
for a smaller bolt. I suppose it adds a little strength to the joint, but
not much.

Paul, KD7HB

I have helped install a couple of towers and have done that, but did not
know that was the reason.

Have also used that Tower Jack to help out, but only knew about that in
the last 10 or 15 years.



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On 1/17/2014 12:09 PM, Ralph Mowery wrote:

"Paul wrote in message
...
On 1/15/2014 4:55 PM, Ralph Mowery wrote:
While on the subject of tower bolts, why does Rohn 25g tower use two
differant size bolts on the legs ?

Obviously none of the respondents have had to mate two obstinate sections
of Rohn 25g together.

The smaller hole is for a drift to force the sections into alignment so
the larger bolt can be installed. Then you have an empty hole just right
for a smaller bolt. I suppose it adds a little strength to the joint, but
not much.

Paul, KD7HB

I have helped install a couple of towers and have done that, but did not
know that was the reason.

Have also used that Tower Jack to help out, but only knew about that in
the last 10 or 15 years.



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I built a jack a couple of years ago, but have not had a chance to use
it yet.

Paul

"Paul Drahn" wrote in message
...

I built a jack a couple of years ago, but have not had a chance to use it
yet.


I built, or really had one of the guys in the shop where I work help build
one for me just before I put up my tower. Built out of scrap material and
in some spare time. Probably cost them $ 200 worth of labor..hi hi.. I
almost hate retirement ( retired 2 years) as I lost access to small pieces
of material and the equipment and people to help make small things. We had
a machine shop that could make almost anything that was not too complicated.
Couple of lathes, shears, benders, milling machines, and don't remember what
this one machine was called (thinking Iron Man) that could punch holes and
various shapes in steel and do some bending of very thick pieces.



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On 1/17/2014 3:00 PM, Ralph Mowery wrote:

"Paul wrote in message
...

I built a jack a couple of years ago, but have not had a chance to use it
yet.


I built, or really had one of the guys in the shop where I work help build
one for me just before I put up my tower. Built out of scrap material and
in some spare time. Probably cost them $ 200 worth of labor..hi hi.. I
almost hate retirement ( retired 2 years) as I lost access to small pieces
of material and the equipment and people to help make small things. We had
a machine shop that could make almost anything that was not too complicated.
Couple of lathes, shears, benders, milling machines, and don't remember what
this one machine was called (thinking Iron Man) that could punch holes and
various shapes in steel and do some bending of very thick pieces.



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IronWorker!
Paul, KD7HB

On Wed, 15 Jan 2014 19:55:05 -0500, "Ralph Mowery"
wrote:

While on the subject of tower bolts, why does Rohn 25g tower use two
differant size bolts on the legs ?

I guess you mean this collection of bolts?
http://antennapartsoutlet.com/Pages/Products/ROHNPages/R25JBK.html

My guess(tm) is that the larger 5/8" bolts go on the bottom set of
holes, which aligns the tower vertically and carries most of the
vertical load (tower weight). These lower holes are probably drilled
more accurately than the upper holes. The smaller 1/2" bolts fit
loosely into the upper 5/8" holes in case someone didn't bother
drilling the tower and the base with the same distance between bolt
holes, or that the tower legs became bent, stretched, twisted, or
mangled. This is only a guess(tm).

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558