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Re: [TCML] At a loss. No light on second coil
I have some quick pictures that I took which can be found here:
https://plus.google.com/photos/106207747745634902315/albums/5859412863551197185?authkey=COvb-e7kqte8cg
I have not tried drawing arks from the Toroid as I want nothing to do
with being that close to it when I am pushing that much power to it. I
did try the breakout point though with no result. There are no arks
whatsoever. I did check for carbon and found nothing there either.
I have also checked and rechecked to make sure I had my math right.
But I did assume a few things.
First of all, my power supply is mostly assumed as I have no way to
test it outright. I have 4 mots, all the same. They are 20:1 as I
found out when I wired them in reverse and got just over 6v out from a
122v in. I have no idea what the amperage is. I was going on the
assumption that it was anywhere from 300-700ma and have adjusted to
test for each.
The primary has a inside diameter of 8", it is a .25" copper tube with
.375 spacing, and a total of 11 turns.
Secondary: 4.5" diameter, 24" tall, 1097 turns of 24awg magnet wire.
Cap: 108.71nF at 28kV
Static Sucker Gap quenched by a shop vac.
Toroid is 4"x22" and I have also tried a 4"x28" which both fired on my
NST power supply. Toroid is connected with foil tape to the stripped
wire at the top of the secondary.
Thank you again,
-Andrew
On Mon, Mar 25, 2013 at 6:14 PM, <jhowson4@xxxxxxxxxxx> wrote:
> Andrew,
>
> Do you have any pictures of your coil?
>
> Off hand a few things i cant think of that would cause this,
>
>
>
>
> Have you tried drawing arcs, or providing a breakout point?
> If your getting a tiny 1" arc vs no arc, then that would tell us something about the situation.
>
> Perhaps your toroid is too large preventing a break out.
>
> Have you looked inside your secondary for carbon tracking?. I had a small secondary that dumped the arc right to ground via surface tracking on the inside of the pipe.
>
>
> Mistaking radius and diameter in your calculations would effect tuning (I don't mean to insult your intelligence, but its happened before i'm sure)
>
> Hope any of the above helps.
>
>
>
> I also have a couple small hunks of 3/8" OD tungsten laying around here somewhere, contact me off list if your interested.
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
>
> ----- Original Message -----
> From: "Andrew Webster" <andrew600rr@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Monday, March 25, 2013 5:26:16 PM
> Subject: [TCML] At a loss. No light on second coil
>
> Hello list,
>
> I hope you all can help me here. I am at a loss. I have finished my
> second coil after a very successful first build. My first build was
> powered by 2x Franceformer 15kv 30ma NSTs, 14.7nF Saltwater Cap.
> Primary: .25inch copper tube with .375 spacing for a total of 11
> turns. Secondary: 4.5 x 24 1097 turns of .24 on a PVC pipe. Toroid was
> your basic 4x22 dryer duct. I was also able to use a 4x28 but the 22
> provided better results. Forced air static gap
>
> For my second coil I wanted to go bigger! So I built a 4 pack MOT
> stack and wired for 240. Center grounded and under oil. There is no
> ballast on this and I can draw some nasty sparks off of this. I also
> setup a MMC 14x10 942Cs for a total of 108.71nf. But I have reused the
> primary, secondary, and toroid off of the first build
>
> I am using a static sucker gap as I melted the brass off of the ARSG
> in seconds. The static gap is holding up better to the heat until I
> can get some tungsten.
>
> The issue is that no matter where I tune it I cannot get anything out
> of it. I have checked my connections. Checked ground. Cap is firing,
> the gap is deafening. I know it is all working but no spark. I checked
> on Tesla Map, Java TC, and a good old piece of scrap paper and a
> calculator and I should be on turn 4-5 for an initial tune. Going out
> to 10 every half turn and and down to 2 where the safety gap fires
> almost instantly and nothing.
>
> My thoughts are that I have too much current for my tiny secondary or
> I am flat out missing something.
>
> I will be very grateful for any help and I want to thank you all in advance.
>
> -Andrew
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