Re: Of all things sane...

["BunnyKiller" <bigfoo39-at-telocity-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:

> Original poster: "sundog" <sundog-at-timeship-dot-net>
>
> Hi All!
>
>   Well, my GP03 came in.  2 sheets of 12x12x1/2.  It's heavy,
> beastly stuff, and I can see it'll be almost indestructible as a
> RSG rotor.  The more I look at it, the more I think I'll take it to
> a machine shop and let *them* tear up their tools on it.  Btw,
> McMasterCarr sells this size for ~$13 each.
>
>  On a whim, and in the interest of "what'll happen?", I made myself
> a much-needed rotor for my current RSG, out of 1/4 Polycarbonate.
> It'll be encased in a box for saftey, 'cause I don't much care for
> the idea of the "exploding wheel 'o high-voltage and hot brass"
> Plus it'll cut down on the amount of SG light.
>   The disc is ~6.5" in diameter, and has 18 electrodes (yes, 18!),
> and on the 4k rpm motor should give me ~1000+ bps.  I'll cut my
> tank cap back to ~2-3nf, on a 9/60 or parallel a 9/30 for 9/90.
> Why the 1000bps gap?  I haven't the slightest, but if it doesn't
> simply poweracr all the way around the disc, (i doubt it, the
> spacing is jut a tiny bit less than the 8 electrode disc I used to
> use, and it never powerarced), plus on just 9/30's, it should work
> fine.  I've also got a new 8x23" secondary (cute stubby thing!),
> 1082 turns (i believe) of 26ga wire.
>
>  This, and the continuing tinkering with maggies (they're just
> cool!), should keep me outta trouble this weekend, barring a visit
> from the police (%^.)  So will I go back to 120bps..most likely.
> High-speed motors, the sheer number of electrodes needed (which
> pushes the size of the disc up), and the noise (good grief is a
> 500bps gap loud!), but I prefer the lazy-moving streamers 120bps
> produces.
>
> Well, it's gettin' late, and I got a ton to do tomorrow.
> PS, I see properly set saftey gaps *ESSENTIAL* in any system, but
> especially in this one!
>                                                             Sundog

Hi Sundog...

I did some math on the 4000rpm motor with the 6.5" disc   you are
looking at about 840 uSecs of time between each electrode, that makes it
equal to .84 mSecs ...  pretty fast ( short duration ) for charging a
cap. You probably wont see a full charge on the cap and also the spacing
between electrodes work out to be about 1" apart...  kinda close for
comfort..   you will possibly see power arcs from electrode to electrode
if your power supply is strong enuf ..  but on the other hand ...  if
the amperage is too low you will see misfires and only "use" about 50%
of the electrodes. A final note ...  at 4000 rpm the stresses induced on
the disc will be really intence ( didnt do the math ) from the
electrodes trying to fly thru/off the disc. Be careful with this one ;)


Scot D