Steve,
I'll definitely experiment with the bps. 16 holes will allow for quite a
lot of possibilities....
120
240
480
960
I can't wait to see the final results!
~Dan
On Mon, Oct 22, 2018, 8:30 PM Steve White <steve.white1@xxxxxxxxx> wrote:
> I know that using an optical sensor with an oscilloscope provides a very
> precise way to insure that the flying electrodes line up with the
> stationary electrodes at whatever phase angle on the 60 Hz power line that
> you pick on the oscilloscope. Now, whether or not that is the optimum
> firing point may be a different matter. On my pole-pig powered coil which
> runs at 240 BPS, the firing angles of 0, 90, 180, and 270 degrees which I
> set with my oscilloscope did indeed seem to be the optimum. I built a very
> nice John Freau style phase adjuster to make fine adjustments. When I used
> it to vary the phase angle from the one that I set with the oscilloscope, I
> saw no difference in streamer performance or quality. Maybe the effect is
> much greater with a 120 BPS NST-powered system. Some posters have suggested
> that a 240 BPS system is closer in performance to a ARSG because it fires 4
> times per cycle where firing points may not be as critical.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Gary Lau" <glau1024@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Monday, October 22, 2018 5:09:07 PM
> Subject: Re: [TCML] SRSG strobe
>
> What exactly is the goal here? Assuming that you're successful in getting
> the timing light to sync and fire 120PPS, that still gives no useful
> information as to whether the RSG is set to fire at the optimum phase
> angle. The best you can hope for is confirmation that the motor is in fact
> synchronous and that the phase can be varied. I'm unaware of any means to
> set the phase other than varying the phase and monitoring spark
> performance. The optimum phase of the RSG relative to the mains phase will
> vary with primary cap size and Variac setting, there's no fixed "best"
> setting relative to mains peak. That's why the variable Freau SRSG
> controller* is such a godsend - it's always something that you'll want to
> tweak. In my experience, the SRSG phase is super-critical at 120BPS,
> there's a clear increase in spark performance as I retard the firing, up
> until a critical point, and then it becomes unstable, so I back it off a
> tad.
>
> As far as protecting the NST, a safety gap in parallel is mandatory in
> parallel with the RSG.
>
> For a simpler means of viewing the phase of your SRSG relative to mains
> phase, attach a small magnet to the shaft, and mount a small, high turns
> count inductor so that the magnet sweeps past it. Scope the voltage across
> the inductor and sync the scope to the line. You should see induced
> voltage blips with each sweep of the magnet, and you should see that
> waveform shift as you vary the phase of the SRSG.
>
> *See my RSG web page - http://www.laushaus.com/tesla/sync_gap.htm
>
> Regards,
> Gary Lau
> MA, USA
>
>
> On Sun, Oct 21, 2018 at 11:55 PM Daniel Kunkel <dankunkel@xxxxxxxxx>
> wrote:
>
> > I'm getting ready to build my phase controller to control my new SRSG. I
> > thought I've heard of others use an automotive ignition timing light to
> > strobe and watch the phasing, but I can't get mine to trigger off a 60Hz
> > source. Can anyone offer some advice here?
> > ~Dan
> > Kansas City area
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