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Re: Fwd: RE: [TCML] Rotory STATIC Gap
I'll add my 2 cents.
I built a rotary once comprised of small electrodes (3/16"D) protruding
out about 1.5". The electrodes were screwed into one side of the disc.
The disc was metal. The problem I had is that when the voltage went high
enough, the arc would travel down the electrode and across the wheel to
the other electrode (or attempt to). This was "drawing the arc"
mechanically from one electrode towards the next. When I realized what
was occurring, I decided to use an insulated disc (no copper ring) and
let the arc pass through the electrode placing my stationary electrodes
on each side of the disc rather than on the same side. I think my
problem was mainly that quenching was poor. I suspect quenching is also
part of your problem here, but not sure.
Are you able to arc the distance if the rotary is not spinning and the
rotary electrodes are positioned equal distance away from the stationary
electrodes? Giving that a quick test may help determine if you are truly
arcing the distance or if your drawing the arc across.
When running, it may quench before it reaches the next electrode in
which case may appear like a static gap. I think if this is the case,
the next electrode may not fire and then the following electrode has a
very high voltage which conducts, this time drawing the arc all the way
to the next electrode. And then we start over again. Sort of a very
erratic running situation at that point.
Throwing some food for thought out there.
I think he means that when he goes past 75-80% on the variac the
voltage finds a better path to conduct and acts as a static gap
instead of taking the path that he designed.
If your only using stationary electrodes on one side why have the
---------- Forwarded message ----------
From: "Lau, Gary" <Gary.Lau@xxxxxx>
Date: Oct 23, 2008 2:51pm
Subject: RE: [TCML] Rotory STATIC Gap
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
your coil components (cap and NST?) are not long for this world. That
length indicates that the cap is charging to a MUCH too high voltage.
Any rotary gap, sync or not, needs to have a properly spaced static
gap in parallel with it, so that it fires before the voltage gets out
of hand and things start going poof.
If you're seeing the spark gap jump anything remotely like 2.2 inches,
I'm having trouble visualizing your setup, so it would help a huge
if you could post some photos.
rotating electrodes, and it has stationary electrodes. When you say
that it has static electrodes, or operating in static mode, I'm not
sure what you're referring to.
Also, please be consistent in the use of the word "static". Your RSG has
Regards, Gary Lau
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of bunnykiller
> Sent: Thursday, October 23, 2008 2:09 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] Rotory STATIC Gap
> Hey All....
> I was looking at my spark gap ( SRSG) and noticed that the timing must
> have been off or the primary circuit voltage had jumped up quite a bit
> and started arcing before the electrodes were in position. The gap is
> designed with 4 flying electrodes and 2 static, since I couldnt place
> the statics on each sides of the disc, I had to put them on one
> the disc ( away from the motor). To achieve conduction, I had to
> copper ring around the periphery of the disc to conduct from one
> electrode to the next. (This was done to keep the stationary
> from arcing to the motor.)
> This configuration allowed the primary circuit to charge to voltages (
> well as far as the distance from the stationary gap distance was from
> the copper ring ( 2.2" total gap width)) which would then jump the
> length to conduct. As the electrodes would proceed into the stationary
> region, it would ( im supposing now) lower the gap voltage for
> conduction and eventually quench.
> So in effect, the gap was firing in "static" mode and then finished
> in rotory mode. Guess I need to get rid of the copper ring to have a
> true SRSG.... ;)
> At lower input voltages to the piggie, the gap works fine ( as its
> supposed to) but once past 75-80% on the variac, the "static" mode
> Need to design a better SRSG that can fend off 40KV+ and not attack my
> Scot D
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