A number of years ago the C3E elements kept loosening. We always had an updraft
at the edge of a cliff. Force 12 told us to add additional rivets. At each
joint we had 3 rows of 3 rivets (total of 9) spaced 120 degrees. The elements
no longer loosened.
And I agree with Jim, a pneumatic rivet gun is the only way to fly. Pretty
cheap at Harbor Freight.
73,
N2TK, Tony
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
Thomson
Sent: Monday, March 07, 2016 10:55 PM
To: towertalk@contesting.com
Subject: [TowerTalk] F12 C19XR Rivets
Date: Sun, 6 Mar 2016 19:39:29 -0500
From: Larry <lknain@nc.rr.com>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] F12 C19XR Rivets
Message-ID: <56DCCDC1.2020308@nc.rr.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
In the early days C3, EF 180B, and 240 generally used 0.125 inch rivets on the
elements. The 180B had some 0.25 inch rivets as well if I recall.
Booms used 0.25 inch rivets. The C3, for example, generally had 3 rivets per
joint in the elements. I don't know how different the XR series is.
73, Larry W6NWS
## on my F-12 340N, 520, 615, EF-180B, and F12 shorty 44 foot 40m yagi, all
the rivets are .125, aluminum, and slightly domed heads, with steel mandrels.
The shorty 40m els used longer .125” rivets on the inboard portions only, where
they are triple walled.
## The EF-180B used .1875 rivets on the else.... but only in one place....
like that huge swedge.
All the booms used .1875 rivets on the factory end of each splice...where
as the end user portion of each boom splice used 1/4-20 SS bolts + nylocks.
## No .25 rivets were used any where. Although those small hand riveters
will pull a .1875
rivet, they are very tough to pull. I bought a larger, looks like hedge
shears, type of riveter,
made by pop company, aprx 25 inches long, to do the .1875 rivets. The same
longer riveter will also do
.25 rivets, and also .125 rivets. But the big riveter is too awkward for the
.125 rivets, the small hand
riveter is better for that job.
## POP co also makes a hand riveter, that uses 90 psi from ur compressor, to
pull any size of rivet, it also has an optional device to collect all the spent
mandrels.
## DON’T put any anti oxidant grease on any rivets.... only the els
overlaps. Install ALL the rivets at any
joint before you pull any rivets. IE: install 3 x rivets in a row, then
pull them one at a time. And if rivets 2+ 3
start to back off, after pulling the 1st one, you have to tap the rivets back
in, so they are flush, b4 pulling them.
Tap them back in via the domed heads..and NOT the mandrels.
Jim VE7RF
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