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Re: [TCML] Mid sized Tesla Coil - Done

For a larger pan you may want to try a water heater floor pan. It may be too large for your center but two pans placed almost back to back and with the corrugated ducting almost sandwiched in between may be a thought. I have seen this done on larger coils. Maybe just use one of these pans for the center. Again, this may end up too large but it still might work for you depending on how you assemble.

Happy and safe coiling,
 Terry Leonard

On 3/23/2015 8:03 AM, wt5y wrote:
If you have a hobby lobby in your area they sell an assortment of pie pans in different sizes.

John Cooper

Sent from my Samsung GALAXY S5™, a Cricket 4G LTE smartphone

-------- Original message --------
From: Timothy Gilmore <tdg8934@xxxxxxxxx>
Date:03/22/2015  16:02  (GMT-06:00)
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Mid sized Tesla Coil - Done

Thanks Jon!

I've been putting many hours in every day trying to get it ready for the
showing next Friday. When you say make the toroid topload bigger, I'm
assuming you mean use larger ducting like 8" or larger if I can find it
(instead of the 6" I have now). It was hard to find the right size middle
section and was lucky to find 13" foil pizza trays (as the 4" ducting
torroid toploads use more easily found 9" pie tins). I also used foil
wrapped cardboard inside for more strength but it wants to shift around too
much unless kept tight. Is it more important to have a larger middle
section to the torroid topload or the ducting size (i.e. 6", 8", 12")? It
might be easier to locate a more ridged larger middle section and wrap the
6"+ ducting around that,

Also wrapping it all in aluminum tape would keep it more uniform and flat
(less crinkle like), I also found that adding a large spike nail to the top
of the torroid middle section (wedge in) would direct more sparks out the
end of it. So making it more uniform (or bigger) will allow for less medium
sized sparks and will discharge sparks that are thicker and longer?


On Sun, Mar 22, 2015 at 1:40 PM, Jon Danniken <danniken@xxxxxxxxxxx> wrote:

Wow that looks great, you got that together fast!

A couple suggestions would be to work on your topload to eliminate the
multiple streamers (assuming you don't like multiple streamers), so that
you end up with one larger streamer.   Part of the issue can be caused
by the lack of a uniform surface across the topload, providing multiple
breakout points, or the cause could be too small of a topload.  You
could try cleaning up the topload you have to see if things improve, and
if not, build a larger topload, taking care to keep it uniform (aluminum
tape can come in handy for the seams).

When you get the topload sorted out, you can work on coupling, by
raising the primary (or lowering the secondary), gradually, until you
start getting racing sparks.  When that happens, back it off a bit and
you will be as tight as you can be.

Again, good job on this one!


On 03/22/2015 09:04 AM, Timothy Gilmore wrote:
Here is a better link showing both videos. Another one tonight also.



On Sun, Mar 22, 2015 at 10:36 AM, Timothy Gilmore <tdg8934@xxxxxxxxx>
I finally finished my long awaited mid sized tesla coil. The Tesla Map
software was spot on in the tuning of taping it between turn 12 and 13.
Most sparks are over 3 feet and many are over 4 feet long. I have 2
NSTs at
15kv 60mA using capacitor equivalent of 30nF 30kv stacked in triple
It uses 2 parallel tungsten spark gaps quenched by a squirrel cage fan.
primary is taped at 12.5 turns on the 1/4" copper tubing starting at 8"
outwards. The secondary is 31" tall by 6" diameter of 26 awg wire of
turns. I'm having about 10 of my friends and co-workers over next Friday
for an outdoor showing and cookout after work.

Check out the 2 dry run videos. One I was holding a florescent light
and the lightning jumped over to it and I got zapped through the glass
part. Ouch. Ok but getting the long florescent tubes today. Over $1200
make it.

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