Re: Problems with SRSG on TC

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

Original poster: "Zagarus Rashkae by way of Terry Fritz <teslalist-at-qwest-dot-net>" <arbitrarily_random-at-yahoo-dot-com>

Hi Bart, all,

I just measured the gap spacing and it is .05 on each
side, for a total gap of .1. Sorry for any confusion I
may have caused.

I don't see how this would explain the erratic firing.

Regards,

Chris

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: "Barton B. Anderson by way of Terry
 > Fritz <teslalist-at-qwest-dot-net>"
 > <classictesla-at-netzero-dot-com>
 >
 > Hi Chris,
 >
 > total gap is .7 or .07? (the " .35 on each side"
 > threw me off as it could
 > go either way = really narrow or really wide).
 >
 > If 0.7, then it may very well be too wide. We
 > typically run narrow gap
 > spacing (but not as narrow as 0.035" per side). I
 > run approximately 0.1 to
 > 0.12 on each side of the gap (1/4" or less total
 > gap). The phasing is
 > intertwined. If you have no way of measuring, trial
 > and error will work
 > (moving disk on motor shaft in say 5 degree
 > increments).
 >
 > Take care,
 > Bart
 >
 > Tesla list wrote:
 >
 > >Original poster: "Zagarus Rashkae by way of Terry
 > Fritz
 > ><teslalist-at-qwest-dot-net>"
 > <arbitrarily_random-at-yahoo-dot-com>
 > >
 > >The total gap is maybe .07 inches, .35 or so on
 > each side. I don't think
 > >that is the problem as the TC "off" time is 10
 > seconds or so, then 5
 > >seconds of operation, etc...
 > >
 > >Regards,
 > >
 > >Chris
 > >
 > >Tesla list <tesla-at-pupman-dot-com> wrote:
 > >Original poster: "Barton B. Anderson by way of
 > Terry Fritz "
 > >
 > >Hi Chris,
 > >
 > >How wide is the RSG gap (stationary to rotating)?
 > If it's too wide, your
 > >cap may be firing at too high a voltage and
 > somewhat randomly along the RSG
 > >path. If a firing is missed, the cap "may" continue
 > to charge to a higher
 > >voltage if the transformer is capable. This relates
 > to the RSG firing
 > >intermittently (not at the 240 BPS you may assume
 > it is) and often leads to
 > >the safety gap firing intermittently. BTW, at 240
 > BPS, phase off-peak about
 > >23 degrees. (where voltage and current curves
 > cross).
 > >
 > >Take care,
 > >Bart
 > >
 > >Tesla list wrote:
 > >
 > > >Original poster: "Zagarus Rashkae by way of Terry
 > Fritz
 > > >"
 > > >
 > > >Hi Steve, All,
 > > >
 > > >I did m! odify the motor so that it was
 > synchronous
 > > >without the disk, I don't know what it is with
 > the
 > > >disk and electrodes. I am running at 240bps or 2
 > > >breaks per half cycle so I don't know why losing
 > sync
 > > >would make the TC perform like that.
 > > >
 > > >I have 2 saftey gaps, one across the cap and one
 > > >across the transformer. The transformer one is in
 > > >parallel with the SRSG, so I think it's okay.
 > Both
 > > >gaps are set to around 15-20kV.
 > > >
 > > >Regards,
 > > >
 > > >Chris
 > > >
 > > >--- Tesla list wrote:
 > > > > Original poster: "Steven Ward by way of Terry
 > Fritz
 > > > > "
 > > > >
 > > > > Did YOU make the motor synchronous? Maybe its
 > > > > loosing sync or just isnt
 > > > > modified correctly (like its running a 3599
 > rpm
 > > > > rather than 3600 rpm).
 > > > > Though thats seems unlikely, i cant figure
 > what else
 > > > > would c! ause operation
 > > > > to swing in and out like that. Are you using
 > safety
 > > > > gaps? I hope so! Im
 > > > > also guessing you have tried to play with the
 > > > > phasing? But then again,
 > > > > that should not make operation seem so
 > strange.
 > > > >
 > > > > Steve Ward
 > > > >
 > > > >
 > > > > >From: "Tesla list"
 > > > > >To: tesla-at-pupman-dot-com
 > > > > >Subject: Problems with SRSG on TC
 > > > > >Date: Mon, 30 Jun 2003 20:10:26 -0600
 > > > > >
 > > > > >Original poster: "Zagarus Rashkae by way of
 > Terry
 > > > > Fritz
 > > > > >"
 > > > >
 > > > > >
 > > > > >Hi all,
 > > > > >
 > > > > >I recently completed an SRSG that runs at
 > 3600 RPM
 > > > > >with a 1/4 inch by 7.5 inch dia Lexan disk,
 > with 4
 > > > > >stainless steel electrodes for 240BPS. I use
 > a MOT
 > > >! > >stack running at about 2kVA and a 38nF cap.
 > > > > Secondary
 > > > > >is 1000 turns or so of 22AWG on 4 inch SCH 40
 > PVC.
 > > > > >Toroid is 4 by 16. I don't know what is wrong
 > with
 > > > > my
 > > > > >TC but it only sparks intermittently, and I
 > think
 > > > > this
 > > > > >is due to my RSG. Any clue as to what causes
 > this?
 > > > > >
 > > > > >The TC outputs 3 foot sparks at best, falling
 > short
 > > > > of
 > > > > >the 3.5-4 feet that I got from an air blast
 > single
 > > > > >gap. It goes "zzzt..." and quits, then after
 > > > > another
 > > > > >20 seconds or so it goes "zzzz..." for about
 > 5
 > > > > >seconds, etc...
 > > > > One thing that I never noticed before was that
 > when
 > > > > running at 3kVA or so the cap's saftey gap
 > fired,
 > > > > sounded like a gun firing many times per
 > second.
 > > > >
 > > > > Thanks in advance,
 > > > >
 > > > > Chris
 > > > >
 > > >