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RE: SRSG,RSG, shtuff...

I think it will be difficult to build a rotary gap with your power supply
transformer as low as 4kV.  The gaps will have to be extremely close at
presentation to fire reliably.  This will be particularly troublesome if you
choose to use such a large LTR cap, as a large cap will further reduce the
firing voltage.

You mentioned using a 4"-5" disk.  I don't see a need to go that small.  If
you are making a low power RSG, the electrodes may be made smaller and
lighter than "normal" because they won't get as hot, so you can simply use a
thin (1/16" thick) 6" diameter G10 disk with two pairs of brass acorn nuts
for rotating electrodes.  Such a disk assembly will be light enough that any
very small motor will be able to spin it up.  There is no need for an
additional air blast with a rotary.

Do not attempt non-sync operation with an NST (I've not attempted this but
the List consensus is clear on this point). The only damage you might do to
your NST with a sync gap is if the cap voltage is not high enough to fire
the gap at every gap presentation.  This would cause the cap voltage to
climb even higher, and this risks the NST.  The same problem can also happen
if the motor phase is badly set.

Regards, Gary Lau
Waltham, MA USA

		-----Original Message-----
		From:	Tesla List [mailto:tesla-at-pupman-dot-com]
		Sent:	Tuesday, April 25, 2000 1:21 PM
		To:	tesla-at-pupman-dot-com
		Subject:	SRSG,RSG, shtuff...

		Original Poster: "sundog" <sundog-at-timeship-dot-net> 


		Hi all!  Mullng over a few things here, and needing further
information.

		I have a small AC motor that I would like to use for a
*small* rsg. I only
		intend to use a 4kv30ma nst on it.  now, wintelsa says that
the matched cap
		for that is .0199uf,
		or 19.9nf (i think i have the right number of decimals there
;)
		Before the criticism starts, yes, I could use a plain RQSG,
but I love to
		tinker, and the 4kv unit will be less dangerous and a bit
more tame, plus
		it'll be easier on my mmc.
		Anywho, my MMC (thanks Terry, the caps are *sweet!*), is
17.6kv, -at- around
		5nf a string. now, don't want to play wth resonant charging
just quite yet.
		I did that once with the trashy cap (5nf on a 15kv30maNST),
and while the
		cap died in a matter of moments (it was being tested to
destruction), it
		juiced me good through the heavy-duty smitch I'd been using.
Now I use
		contactors to break the mains, so all I'm holding is 13v-at-1A,
much safer.  So
		I know that before it died, it really shot up there in V.
Mmmkay.  I doubt
		I'll be using much more than a 4 or 5" disc, as the input
power is small
		also.  Now, what kind of damage is this gonna do to my
little NST? Since
		I'll be waay LTR (35nf, trying to avoid that 20nf range), I
assume the nst
		will take the brunt of the pounding.  Will I simply destroy
the nst if I
		even attempt this without grinding the motor for sync
operation?  I haven't
		started on the disc yet, as I don't want to make a neat
lookin' coaster ;)
		The motor will thankfully require only 2 flats.  It is a
small motor tho.
		Originally started life as a fan, but it's got a decent
amount of torque.
		That's the second reason I want to use a small disc.  A disc
that small will
		probably need an air blast to help quenching, I assume.

		soo, you all know what kind of um, insanity I'm about to
attempt, 99% for
		the curiosity and experience of doing it. 1% for the noise
:)  Ideas?
		Comments?  Snide remarks?

	
Thanks for yer time!

		Sundog - Relax and smile. It could be Monday.