[TowerTalk] ROHN TOWER BOLTS UPDATE

[J Chaloupka via TowerTalk]

My idea, not fact.  In assembly to align the mismatch of the two members being bolted a tapered drift pin is used in the large hole to make for perfect alignment.  The smaller bolt is then inserted in it's hole and tightened.  The small bolt then holds the assembly in correct alignment for the large and necessary bolt to be inserted and be torqued to specification.  
Why not use two large bolts?  Well to contain costs and only one bolt is necessary and further there may not be enough metal in the tower leg to allow for two bolts.  (two large bolts mean bolts too close to the edge of the metal etc, etc.

de JIM, WD8QBQ


________________________________
 From: Keith Dutson <kdutson at sbcglobal.net>
To: Tower Talk <towertalk at contesting.com> 
Sent: Thursday, May 8, 2014 11:14 AM
Subject: Re: [TowerTalk] ROHN TOWER BOLTS UPDATE
 

I will guess the original design called for one large bolt.  Likely for
insurance/liability reasons, someone decided to add a second bolt.  It would
not need to be as strong, so a smaller (lower cost) bolt was chosen.

73, Keith NM5G

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Cal
Zethmayr
Sent: Thursday, May 08, 2014 9:16 AM
To: towertalk at contesting.com
Subject: [TowerTalk] ROHN TOWER BOLTS UPDATE
Importance: High

Thanks to everyone for the responses and the info

BUT ONE KEY UNANSWERED QUESTION?


WHY the two different bolt sizes?

Like our Club President N4CU-Bob Walker, I called Rohn in Peoria and was
transferred to CODY...  turns out he is in SALES not engineering.
He said same thing to me,"I don't know why it's just always been that way."

There is a Rohn Grandson of the founder of the company, but he is away from
the factory on a trip.

SO does anyone know the REASON FOR TWO DIFFERENT BOLT SIZES?

And is Rohn the only tower company that does this?

Cal Z
W4GMH

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