Re: RSG- idea, question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Tesla729-at-cs-dot-com>

In a message dated 3/23/02 4:30:04 PM Pacific Standard Time, tesla-at-pupman-dot-com 
writes:

<< Greg,
 
 Sounds like a nice idea.  I've used lexan rotors of about 9" dia,
 and I've run them up to 5000 rpm with no trouble.  I guess my
 max input power was about 2500 watts or so.  The electrodes
 just got a little warm, so they didn't soften the lexan.  Such a
 rotary can be seen at my website.  As far as I know lexan
 can't really crack or shatter, unless certain chemicals influence
 it.  My electrodes are usually 3/8" bolts placed through
 the lexan disc with nuts to hold the bolts in place.  Actually I
 cut the heads off the bolts so both ends can arc.
 
 Cheers,
 John
  >>

Greg, John,

I am using10" diameter, 3/8" thick twin rotors, one on each end of my 
modified Black & Decker 1/3 hp bench grinder with (6) each 2"
long X 3/8" diameter lengths of brass all-thread as rotory elec-
trodes in each of the rotors. I also use SS nuts to hold the brass
electrodes in place and I am using this asynch RSG system to
fire my 10 kVA pole pig Tesla system. Note that there is NO 
tungsten in this SG system as the 4 stationary electrodes are
4" long X 1/2" diameter brass all-thread with (4) EA. 2" X 2" x
1/8" thick aluminum squares affixed to the stationary electrodes
with a lock washer between each alum. square to fascilitate 
better cooling. There is gradual electrode erosion over time but
this system works quite well for me and my coil can throw 10 ft.
sparks at 6 to 8 kVA input. My rotory electrodes don't get much
warmer than ambient temp. whirling at 3000 + RPMs and I have
not had any problems with the lexan disc breaking either. I did
however have to incorporate G-10 into the supports of my staionary 
electrodes though as the stationary electrodes do get quite warm,
even with the aluminum heat sinks.

Sparkin' in Memphis,
David Rieben