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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