Re: [TCML] Spark gap assembly, acrylic?? and toroid size

["DC Cox" <resonance@xxxxxxxxxxxx>]

Don't use Lexan (acrylic) for a RSG.  It may soften and your rotating
electrodes may strike your stationary electrodes, exploding in sharp shards.

Not a very good idea.

Dr. Resonance





On Wed, Jul 16, 2008 at 3:51 PM, John Matok <jmatoknoon@xxxxxxxxx> wrote:

> Scot,
>
> You said that Lexan is good for low temperature applications, but is it
> suitable to use in a spark gap?  On the website that I provided, the plans
> said to use Lexan.  How hot can the Lexan get if it's not in direct contact
> with the copper?  How hot do spark gaps get in general?
>
> Nicholas Goble
>
>
> On Wed, Jul 16, 2008 at 7:56 AM, bunnykiller <bunnikillr@xxxxxxx> wrote:
>
> > Hey John...
> >
> > I havent built the spark gap as shown with the aluminum holders but I did
> > build the one without the aluminum... I had it running on a coil that was
> > powered by 4 15/30 NST's in paralell and it worked quite well. Eventually
> > tho, I had to clean the surfaces of the tubes due to oxidation etc. I
> found
> > that adding a small fan to the unit increased its quenching too... see
> link
> > below for pictures
> >
> > http://members.cox.net/bunnikillr/sprk.htm
> >
> > As far as plastics, obtain a cutting board ( white plastic 1/4"+
> thickness)
> > from places like Wal Mart etc. Usually they are made of HDPE
> > ( Hi-Density-Poly-Eurathane).
> > acrylic,polycarbonate,lexan,plexiglass are ok for low temp applications
> but
> > can be either brittle or "gummy" when machined ( altho Lexan is great at
> low
> > speeds and cuts nice)  normally clear in color
> > Perfboard isnt really a plastic its more of a laminate/epoxy combo
> > MMC's are good on either HDPE, perfboard or G-10
> > Sparkgaps work best with G-10 due to the heat produced
> > Primary coil, once again HDPE
> >
> > Toriod size "normally" is about the same over dia = to length of
> secondary
> > and smaller dia =to a bit less than secondary dia.
> > example, you have a 20X4.5    toroid would be good at  18-20 X 3-4
> >
> > a second primary on a different power supply... ummm I would say no.  a
> bi
> > level primary on a single supply would work... someone on the list has
> done
> > so but I dont remember who did it... I dont know if it increased output
> tho,
> > seems to me it wouldnt..
> >
> > A magnifier is a "2 coil system", it has a very tight coupling coeficient
> > on the 1st primary/secondary coil which drives a second secondary and
> > toroid. Special design considerations must be made to get this type of
> > system to work properly. Antonio has some great literature on this type
> of
> > coil...
> >
> > Scot D
> >
> >
> >
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