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You don't mention what kind of spark gap you are using. In my coil I
used some "hot rod" construction techniques that worked out pretty well.
I kept the neon transformer far away from the secondary so it's mass of
metal wouldn't distort the magnetic field from the primary.
I arranged my capacitors in radial lines under the primary to minimize
induction losses, and I used 100% copper piping to connect the primary,
capacitors and spark gap. Not even a single washer of steel or brass was
used in the critical circuit and the piping was kept as short as
possible. Copper and silver are the best conducters and copper plumbing
parts are cheap and easy to get.
Also I kept anything like a loop or washer of metal far away as
induction losses can happen there too. I theorized that this arrangement
would allow the maximum amount of current to flow through the primary on
that critical first discharge.
Don't just presume that square shapes and arrangements are all you have
to think about. The oscillating magnetic field from the primary is in
the shape of an expanding and contracting torus. Keep magnetic
distortion, induction losses, current limiting wires and materials, and
extra lengths to a minimum and you will have a real dragster.
On 10/25/15 05:09, wt5y wrote:
>
>
> I use a laminates and plastics 10" blade on my table saw for cutting HDPE, would work for any cutting board. I found a one inch thick board of HDPE Plastic I drilled the holes to fit 1/4" copper tubing then cut through them with table saw to make them insulated supports for the primary coil. Got it from sears, sure you can find same blades at home depot, lowes, harbor freight, etc. It will have smaller teeth than a regular wood blade. I have used the Temco brand magnet wire from Amazon/Ebay on both my secondarys. The original was 26awg on 4" pvc. The latest being 20awg on a 6" secondary form of pvc.
>
> I used the same caps in my MMC .15UF 2000VDC. but I used 16 In a string. Started with 1 string. Now I have 4 strings for a total of 64 caps. Started with 12kv 30ma. Then 12kv 30ma x 2. Ended up with 12kv 60ma x 3 for 10ma total.with 64 caps.
>
> Don't forget Terry filter.
> John cooper
>
>
> Sent from my Samsung GALAXY S5™, a Cricket 4G LTE smartphone
>
> -------- Original message --------
> From: Matthew Sweeney <msweeney23@xxxxxxxxx>
> Date: 10/24/2015 21:05 (GMT-06:00)
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Subject: [TCML] Tesla Coil Magnet Wire
>
> Hi all, I'm gathering supplies for my new small Tesla coil (4" x 20"
> winding) and have a few quick questions.
>
> I calculated to use 26AWG wire for this secondary, I've heard it is best to
> use 22AWG or larger but I believe that is only for larger coils correct?
>
> I found some affordable wire on Amazon:
>
> http://www.amazon.com/TEMCo-AWG-Copper-Magnet-Wire/dp/B00LV8YX7Q/ref=sr_1_19?s=lamps-light&ie=UTF8&qid=1445737908&sr=1-19&keywords=26awg+magnet+wire
>
> This is 26AWG Polyurethane with a Polyamide over-coat. Does anyone have
> experience with this manufacturer (TEMCo) or have suggestions on a more
> reliable source? I'm willing to pay more for better quality but within
> reason of course this is just a small coil.
>
> I'm planning on using 13X0.15uf/2000V capacitors for about 10pf at 26KV
> driven by a 12KV/30ma NST. Do you think that is sufficient voltage on the
> MMC? I'll be using an adjustable PowerStat 20A power transformer so I can
> run at lower voltages at first.
>
> I can add more capacitors (30 total) but then the capacitance drops too low
> towards resonance and I don't want to destroy my NST =)
>
> I am still in pre-build stage so any suggestions would be very welcome.
>
> Oh also does anyone know the best way to cut cutting board for supports? I
> figured a table saw is inappropriate I do have a small band-saw but I guess
> I'd need a different blade for plastics vs wood?
>
> I'm trying to source some thin-walled 4" PVC but no luck so far except
> special order for 20' lengths at menards - that won't fit in my car =)
>
> Thanks for any suggestions!
>
> Matt
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