SGG Questions - Cliff's Notes
From: Cliff Fahrer [SMTP:cfahrer-at-In-Touch-dot-net]
Sent: Thursday, January 22, 1998 6:56 PM
To: Tesla List
Subject: Re: SGG Questions - Cliff's Notes
Tesla List wrote:
> From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent: Thursday, January 22, 1998 5:20 PM
> To: Tesla List
> Subject: Re: SGG Questions - Cliff's Notes
> to: Cliff
> You must be vary careful running a non-synchro high rep rate RSG with a NST
> as a power source. The NST will usually blow with a high rep gap. You
> might consider a good solid synchro gap design firing at 120 PPS as a solid
> > From: Cliff Fahrer [SMTP:cfahrer-at-In-Touch-dot-net]
> > Sent: Wednesday, January 21, 1998 7:18 PM
> > To: tesla-at-pupman-dot-com
> > Subject: SGG Questions - Cliff's Notes
> > First off I would like to say that I'm very impressed with the kind help
> > and good information that has been submitted to the Tesla List. I have
> > only been signed on for a couple of months and my brain has already shut
> > down 3 times from information overload.
> > My questions concern a rotary spark gap that I have almost completed.
> > The basic Tesla Coil system design is:
> > 1. Neon sign transformer mfg by Transco with a 120 volt primary and a
> > 9000volt 120MA secondary.
> > 2. Glass Plate capacitor in transformer oil measured at .032uf.
> > 3. The Tesla coil has a spiral wound primary with a 6in dia inner
> > winding. I used 1/4 inch copper tubing with 1/4 inche spacing between
> > windings. The secondary is tight wound with AWG 30 copper enameled coil
> > wire on a 2 inch carboard tube. The secondary has 3000 turns.
> > Now the rotary spark gap questions:
> > 1. The rotary spark gap is 8 1/2 inches in dia at the tip of the gap
> > points. I plan to use 1/8 inch pure tungston rods with rounded tips for
> > the gap points. Is the diameter correct? Also has anyone tried pure
> > tungston for the spark gaps? The Rotating disk has 8 point gaps that
> > operate in series.
> > 2. Should I make the stationary points adjustable for dwell? (My next
> > construction step is making the stationary point assembly.)
> > 3. The big RSG question: (Which is probably to late at this point in
> > time because it is already constructed) is: I used a DC servo motor with
> > a solid state controller for speed control. The motor is rated at 10nm
> > torque continuous. The motor with the controller has been tested to run
> > at 3600rpm giving me 580 bps gap speed. Has anybody tried a rig like
> > this, or am I doomed? I plan to shield the controller and keep it at a
> > safe distance from the high voltage circuit. The motor case will also
> > have a size AWG 10 wire to a seperate ground rod.
> > The last question:
> > When the RSG is completed and if it works ok on my small Tesla coil, we
> > plan to use it on a 50KVA Tesla coil. Is this RSG big enough for a 50kva
> > system?
> > Thanks,
> > Cliff :-) (So many questions - To little time - So much to do)
Thank you good Dr.
I Have a pole pig in the wings, it will need some TLC and a new
secondary but I think I will scrap the NST idea and spend some time
re-doing the transformer. I just read several messages on the list that
stated the problems using an NST with a RSG. It made good sense.