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.
Scott,
If your only using stationary electrodes on one side why have the
copper ring?
Garry Neeley
---------- 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>
Hi Scot,
If you're seeing the spark gap jump anything remotely like 2.2 inches,
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.
I'm having trouble visualizing your setup, so it would help a huge
amount
if you could post some photos.
Also, please be consistent in the use of the word "static". Your RSG has
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.
Regards, Gary Lau
MA, USA
> -----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
side of
> the disc ( away from the motor). To achieve conduction, I had to
place a
> copper ring around the periphery of the disc to conduct from one
> electrode to the next. (This was done to keep the stationary
electrodes
> 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
2.2"
> 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
off
> 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
appears.
>
> Need to design a better SRSG that can fend off 40KV+ and not attack my
> motor....
>
> Scot D
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