Re: Practical problem with SRGS

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

Original poster: "Yurtle Turtle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <yurtle_t-at-yahoo-dot-com>

That sounds kinda like a gap I gap I built a while
back using an 1800 rpm sync motor mounted vertically
on a 12" x 12" x 12" wooden box. However, mine was
thrown together and not made pretty. I had to rotate
the disc to change the phase angle (This was before
the John Freau phase adjuster.)

http://www.geocities-dot-com/yurtle_t/tesla/gap.htm

As to your problem, I've never run mine without a coil
hooked up, but I can tell you that if the timing isn't
fairly close, it makes a terrible racket. It's
probably good to use a safety gap when playing with
this. Of course, if you use John Freau's phase
shifter, it should be easier to adjust as you slowly
bring up the coil's power.

Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>
> 
> Hi All,
>       Don't everybody panic, but yes, this really is
> a post from me on a
> non-theoretical, non-philosophical topic. (Gasp!)
> I have just completed a "Face-down" SRGS, that is,
> with the motor mounted
> vertically with shaft through the top of the
> 12"x12"x6" "Blast Box"  with the
> moving electrodes pointing downwards from the face
> of the disk, and the
> stationary electrodes mounted on a  rotatable PVC
> ring pointing upwards from
> the floor of the box.(Think commode flange) I am
> using a 6"X1/2"  disk with two
> electrodes and a 3600 RPM SP motor rated 1/7 hp so
> power should not be a
> problem. 
>          The position of the electrodes checks out
> with a modified RS strobe
> (thanx for the design, Terry) The test setup is as
> follows: 
> I am using a spare 15/60 Allanson NST supplied from
> a 120V/20A Variac. Power to
> motor is off a different circuit and is not
> adjusted. For test purposes, the
> gap is just across the HV terminals with gaps set at
> ~4mm each. the blast box
> has a 4" fan mounted in a hole on one side for ozone
> removal. ends of box are
> 1/4" PVC pegboard. Sides, top, and bottom are 1/2"
> Melamine-coated composition
> board.
> What I expected: Nice uniform sparks with a fairly
> constant hum (compared to my
> sucker gap),so it could be fine-tuned before
> installing on coil.
> What I got: Bursts of erratic sparks with
> several-second periods of silence
> between.
> Question, has anyone had similar experience? If
> so,what am I missing?
> 
> 
> Matt D. 
> G3-1085
> 
> 


=====
Adam Minchey
yurtle_t-at-yahoo-dot-com
http://www.geocities-dot-com/yurtle_t/index.htm