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Re: [TCML] RSG disks - who can make them ?
In a message dated 11/21/2007 11:56:10 A.M. US Eastern Standard Time,
list@xxxxxxxxxxxxxxxxxxxxxxxxx writes:
>I think there is 2 problems to deal with in anycase related to power
arcing.
>So if the AC cycle hits 10KV and the gap fires, assume the tank is now
>empty, the transformer will try to charge the tank cap up again. As the air
>is already ionised its probably the tank cap only needs to charge for a
>couple of KV and the gap will trigger when it is supposed to be off.
Really
>there needs to be a small delay where the tank cap cannot charge.
Chris,
There are three issues here; 1) power arcing, 2) refiring, 3) quench on
other than the 1st notch, or what you call re-triggering. A coil can quench
on the 3rd notch for example
but not be power arcing, and not refiring. On the other hand a coil could
be quenching on the first notch, but still refire. Power arcing is something
more extreme where quenching fails completely. Regarding the delay
you speak of, it's true the cap starts charging right away after the gap
quenches. But it takes time to reach a high enough voltage to jump
the gap. If the cap is too small, or the rotary is too slow, or the
electrodes
are too wide, then refiring can occur. Usually refiring is not a problem and
does not occur. Power arcing only occurs when the gap runs very hot,
or there's no ballasting, extreme situations like that. Normally power
arcing is not a problem and doesn't occur. Regarding what I'm referring
to as refiring, that is different than what you are referring to as
re-triggering.
The re-triggering is just the re-ignition after the first notch which leads
to the second notch.
>I am not saying it is easy, it needs a lot of thought but I do not see
>anything wrong with the idea. I threw together my first coil all built on
>general terms and worked well, though there is no arc after the physical
>alignment of the electrodes. With low powers of 500W it probably cannot
>happen, it is either that or my just is very efficient at energy transfer
>and drains all the tank energy very quick. As not much design thought went
>into it, either I got lucky with the design and it worked very well in
spark
>gap quench or 500W does not suffer with power arc problems. Maybe a bit of
>both, but if designed correctly there should be no power arcing in the
first
>place.
Very few coils actually power arc. Only those rare coils that are very
badly designed ever power arc.
You mentioned that your coil does not stretch the spark. This is normal.
Only bad power arcing coils stretch the spark. The spark stretching
occurs before electrode presentation just as the gap fires, as you said.
Then the quench occurs while the
electrodes are aligned. My offset electrode work was a special case
of course.
>I think the issues is still there that 1st notch does not work, when in
>theory it should work better. So as 3rd or 4th does... why is that ?
I'm not sure what you mean when you say that 1st notch quench doesn't
work? Ed Wingate's magnifier quenches at 1st notch at full power and
his coil works very well. Some other folks' coils may be also quenching
at first notch too, who knows? Most folks have never scoped their
quenching waveforms !!!!!
>Something is still missing I think. I like things to add up in theory and
in
>practice... a lot of aspects seem to be a bit generalised and some points
>are never really solved and just end up a matter of general opinion. I
think
>the challange of 1st notch quench is still out there... Though that is just
>my own opinion ;-)
I agree that the issues involved in first notch quenching are worthy
of further experimentation.
John
>Chris
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