Re: Skeleton coil forms, Big coil update

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Original poster: "brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg1-at-mcttelecom-dot-com>

Hi, two things came to mind here, first you could find a string about the
same size as the wire, and the skeliton frame i built years ago i just gave
it a coat of urethane and forgot about it. i have seen coils built where
they dusted it with fibre glass(tiger hair) to help fill in between.cul
brian f.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, June 12, 2001 8:55 PM
Subject: Skeleton coil forms, Big coil update


> Original poster: "Jason Johnson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>
>
> I was thinking about the construction of my BIG coil (June 2nd, Few
questions
> about large coils), and about a comment about my planned secondary of
12"x54"
> close wound w/ 21 guage magnet wire, was way to small for 17 KVA, and it
hit
> me- you can make a secondary twice as big with the same amount of wire if
you
> double the wire spacing (this should have been obvious earlier but oh
well). So
> I'm now thinking about building a 14" x 100" secondary on a skeleton form
with
> with 21 guage magnet wire and with the spacing equal to the wire diameter.
Now
> this is easy enough, I just wind two wires on and take one off after I'm
done
> (I have three 14lb spools of 21 guage magnet wire but I need two for other
> projects). But the problem is now how do I coat it? half of the surface of
the
> secodnary is going to be open with nothing underneath it. Do I need to
coat it?
> I know from personal experience that magnet wire under tension with
nothing to
> hold it (like polyureathane) does stretch over time and may become loose
on the
> form, but I have no Idea how much 21 guage wire stretches (or even if it
will
> at all, all my other stuff is finer than this). How many other people have
> built large secondaries on skeleton forms?
>
>
>
>