Fwd: RE: [TCML] Rotory STATIC Gap
bunnikillr at cox.net
Thu Oct 23 20:20:13 MDT 2008
Even tho the secondary was scavenged for the wire, I went ahead and did
the NO-NO test on the primary circuit. ( yes I ran the coil without the
secondary in place)
I ramped the variac up to 80% and hit the button for the relay to
engage. The first 2 times resulted in the safety gap firing only. The
3rd and 4th time resulted in an arc going directly to the copper ring
for about a second or less than the safety gap took over. I had moved
the rotory electrodes away from the stationary electrodes to make sure
that they wouldnt be a part of the equasion. BTW, the safety gap was
several times louder than what normally occurs with the secondary in
place.... on very rare and I mean rare ( happened twice in 9 years)
the safety gap would fire and then become like a small jacobs ladder arc
for about a second, the arc would quench and then go back to the popping
> Hi Scot,
> I'll add my 2 cents.
> I built a rotary once comprised of small electrodes (3/16"D)
> protruding out about 1.5". The electrodes were screwed into one side
> of the disc. The disc was metal. The problem I had is that when the
> voltage went high enough, the arc would travel down the electrode and
> across the wheel to the other electrode (or attempt to). This was
> "drawing the arc" mechanically from one electrode towards the next.
> When I realized what was occurring, I decided to use an insulated disc
> (no copper ring) and let the arc pass through the electrode placing my
> stationary electrodes on each side of the disc rather than on the same
> side. I think my problem was mainly that quenching was poor. I suspect
> quenching is also part of your problem here, but not sure.
> Are you able to arc the distance if the rotary is not spinning and the
> rotary electrodes are positioned equal distance away from the
> stationary electrodes? Giving that a quick test may help determine if
> you are truly arcing the distance or if your drawing the arc across.
> When running, it may quench before it reaches the next electrode in
> which case may appear like a static gap. I think if this is the case,
> the next electrode may not fire and then the following electrode has a
> very high voltage which conducts, this time drawing the arc all the
> way to the next electrode. And then we start over again. Sort of a
> very erratic running situation at that point.
> Throwing some food for thought out there.
> Take care,
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