Dan,
Since I read that you are using a 3600 RPM rotor, balance will be crucial, otherwise it could fly apart or shake your coil to pieces. I had a very hard time balancing just 4 tungsten flying electrodes on an 11" rotor turning 3600 RPM. I can't imagine how I would balance 16. I hope you have special balancing equipment. Even if you get the rotor perfectly balanced, as the the flying electrodes wear, the rotor will begin to unbalance. It all depends on how even the erosion is. What I am saying is that the more flying electrodes that you have, the more difficult things become.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Daniel Kunkel" <dankunkel@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, October 22, 2018 8:37:46 PM
Subject: Re: [TCML] SRSG strobe
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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