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Re: This week's update....

Christopher

Next -

1. Use Wintesla or another similar prog to work out the frequency and
number of turns of the secondaries. If you have about 700-1000 turns on
each you are in the right ballpark. Go for a topload of say a 4 or 6" by
24" centre-to-centre toroid and this will be incorporated into the
frequency calcs.

2. Decide which neon you're gonna use (I'd say start with the 12-at-30) and
work out the cap size (again Wintesla will do this). This could either
be resonant or larger than resonant. Check other posts for info in this.
However for a coil of this size none of your neons are really beefy
enough on their own and you may really need to consider paralleling two.
Perhaps acquire another one or 2 12-at-30. Smaller coils will actually
produce longer spark at these power levels, but with a six inch
secondary you have the option of pumping in maybe upto 3-4kVA for *huge*
sparks (several feet).

3. Work out by hand how to build up your MMC. The voltage ratings of
your series strings (add the individual cap ratings together should be
at the very least equal to your peak NST output voltage (ie 1.414 *
RMS). You should allow another 30% on top of this. You then work out how
many parallel strings you need to get the require value. Juggle with
different individual cap values to see which works out most economical.

4. Look in Wintesla again to see how many primary turns you will need to
resonate with this cap value. It should be between at least six and at
most 15.

5. The primary can be either tube or strap. Strap is fine as long as you
sand the edges down so they are rounded not sharp.

6. Lookk in the info section in the list re the cylinder sparkgap. This
is by Richard Quick, the filename should begin 'RQ'.

7. A single gap is fine also if heavily quenched by a powerful fan, eg a
vacuum cleaner motor. Look at Gary Lau's webpage for details on one of
these. Lots of series gaps will quench better with lower airflow, you
are correct here.

8. Rotaries are very hard to build safely. You will need to have the
thing precision machined. As I am aware from other postings, tolerances
should be of the order of 0.001".

Alex Crow




> Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com>
>
> Made 3 secondary coil forms for Project 1:
>      1: 6" X 24" Windings with 1/2" clear on top and 6" clear on
> bottom. Tube get's 1/2" bigger in dia. right below the windings (for
> connecting 2 lengths together.
>      2: 6" X 24" Windings with 5" clear at top and 6" clear at
> bottom.
>      3" 6" X 60" Windings, leftover tubing.
>
>      All three tubes will be power washed (after we've already
> cleaned them throughly) then baked dry, then dipped in Enamel/Varnish
> and baked again between coats.(5 coats)
>      After being cleaned and sealed, they go on a lathe and get spun
> with 20 AWG High Temp/Moisture resistant motor winding wire. BTW the
> wire comes in a bucket, not on a spool, weird...
>      Once wound, checked for overlaps,kinks, and other anomale, they
> get the dip and bake again for another 5 coats.
>      We should have them back within a week.
>
> Alright, now I've got a selection of secondaries. I've got the 3
> nst's 15KV-at-30 12KV-at-30 7.5KV-at-100, and I'm NOT paralelling them. (I had
> to go through hell to get them and can't easily replace them,
> otherwise I would. I'm rather curious to see, you know?)
>    I've also got a matched set of four FIT's (Furnace Ignition
> Xformers) rated 10KV-at-23.
> What next? I'd like to build an MMC and have a source for bags of 100
> of 1250V caps (I can't remember the ratings...).
> Should I start the gap now? I'd like to start with a simple static
> for testing and then go with a rotary.
> I've seen a static gap made around the inside of a piece of PVC pipe,
> how do I do this? I think I"ve got it, but not sure.
> Why do static gaps always have a bunch of little gaps instead of just
> one? Quenching?
> What is this Quenching on the 1st, 2nd, or 3rd? What's the best?
> I'm thinking of scroungeing sone soft copper tubing for the primary,
> what size? 1/4" 3/8" 1/2"?
> Should I just use copper flat stock? 2" X 25' or so? Or will corona
> losses eat me?
>
> In other news...we finally registered all our licenses. The Geek
> Group is now a licensed, legeal, and official entity. Now we need
> venture capital!
>
> With hardened enamel under my nails...
> -The Coronaphile-
> (he's gonna kill me for this...;-)
>
> Christopher A. Boden
> The Geek Group
> 344 Ionia SW
> Grand Rapids MI
> 49503
> (616)-574-4065
>
> The Geek Shall Inherit the Earth!
>
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