Re: Medium coil considerations

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

Well thanks for the encouragement Bart! I just came up from the basement,
finishing the winding to 30". I'll go ahead and add the other 2 " tomorrow.
Then I have to use some polyethalyn varnish to seal it. Does anyone know if
the clear varnish will stain the clear acrylic tubing?
Alright when I get to the point of needing the toroid, I'll go ahead and
weld the plate on. Of cource any and all further comments are welcome.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, August 05, 2005 1:04 AM
Subject: Re: Medium coil considerations


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Mike,
>
> You won't see a difference in the 5.3:1 or 5:1 ratios. Because they
> are so close, you would be hardpressed to find a difference. Most
> people take Dr. R's recommendation of building an h/d somewhere in
> the vicinity of 4:1 to 5:1. 5.3:1 is fine if that's what you choose.
>
> John had a good idea of putting a smaller second toroid below the
> half toroid, but for a more permanent solution, I think you have the
> right idea of welding (and of course smoothing out the weld) a flat
> disc to close up the open side. A flat disc will work perfectly well.
> Many toroids are built this way.
>
> Take care,
> Bart
>
> Tesla list wrote:
>
> >Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
> >
> >Hi all! First let me say, thanks to everyone on the list. I've been
> >monitoring this sight for over 10 months, gathering information, and
learning
> >as much as possible while lerking in the shadows. I found about it from
Dr.
> >R back in late october when I bought a pig, 18" fiberglass coil form, and
a
> >34 X 8.5 inch toroid. I am working on a big coil. I succesfully built a
4"
> >coil that gives me about 40" sparks with a 15/60 NST.
> >I sent this same intro a while back in the middle of another thread.
> >My name is Mike
> >and as can probably be seen I live in Wisconsin. For that matter I
> >would like to
> >meet/ corespond with other Wi coilers. Maybe at the comming
> >Cheeshead Teslathon,
> >if not before.
> >I think before i fully dive into the giant coil, I should build a
> >medium coil and start
> >playing with 3 - 5 KW. I plan on winding 20 awg wire for 30 to 32
> >inches on an exact
> >6 inch o.d acrylic form.
> >First question;    Am I better of winding for 32 inches with a H:W
> >ratio of 5.3:1 and
> >957 turns    -or-
> >for 30 inches with a H:D of 5:1 , and 897 turns.
> >Here I figure the greater the distance from toroid to primary the
> >better, but is keeping
> >under 5 preferable?
> >Second question;   I bought the 'half toroid' from Norman F. Stanley. see
> >'half toroid for sale' in july archives for pics. Anyway it is a 24'
> >spun toroid. It is not a
> >conventional toroid, that is O-----O as a cross section, but rather
(_____)
> >with an 18 inch hole in the top. I was wondering if simply tig welding an
18"
> >plate in the hole (properly smoothed etc.) would be adaquet for
> >controling the field,
> >and preventing breakout of my top turns. Or should I try to find a
> >concave aluminum
> >dish to weld in the hole, so the toroid fits down, and 'hugs' the
> >top of the secondary.
> >Again much thanks to a fantastic group of folks!
> >
> >