OK. Tee nuts are dirt cheap, widely available and
won't pull out. They need only a drilled hole. No special
tools are needed for installation (a hammer works).
Using tee nuts, the thinnest of metal can be used.
vy 73,
Bryan WA7PRC
--------------------------------------------
On Thu, 3/20/14, Charlie Gallo wrote:
Subject: Re: [TowerTalk] [RFI] Back of desk grounding buss
Date: Thursday, March 20, 2014, 8:53 PM
One thing I
don't worry about is how to make a connection that
won't pull out. I have a machine shop, and know the
tricks. It all depends, there are different ways to do
it. Like I said, more than three threads (NC) and you
usually won't have a problem. That said, the hole has
to be on size, properly tapped etc (for material that CAN be
roll tapped, roll taps are the way to go). Assuming we are
talking Cu (or AL), and 1/4-20 studs, 1/8 doesn't GIVE
you 3 threads, you need to go at least 3/16, and for Cu, you
probably want to go 1/4" (hard to get 7/32 stock).
If it is thinner than
that, you can bolt through (as some have said), or better,
press in some headed studs from the back side (something
like a type TFE pem stud)
http://www.fastenal.com/web/products/details/0127639?searchMode=productSearch&zipcode=&filterByStore=&filterByVendingMachine=
(you can also get copper
studs)
I know how to make connections to Cu (or Al -
the internal tooth star washer works well), the question was
more "OK, we know Cu (well, silver, but) is the best,
but is Al OK". There has been some arguments among
local hams if the difference in conductivity would make any
difference (I was on the NO side) but some were "The
difference on conductivity will increase the voltage rise
enough to cause issues with a lightning strike"
--
Charlie
On 3/20/2014 Bryan Swadener wrote:
> I make connection to it using machine
screws and _TEE NUTS_.
> Where I want a
connection, I drill a hole to accept a Tee
> nut, and press it into the back using a
C-clamp. Then, the
> connection can be
made using only a capscrew, as tight as
>
you like.
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