Hi Gary, Thank you for your reply. I know I am inexperienced in this field,
and thank you for pointing this out. Perhaps,tho, someone could point me to
some information on the design and construction of RSG's so I could become
more experienced.
Thank you again, Doug J.
-----Original Message-----
From: Gary Lau
Sent: Monday, September 17, 2018 8:11 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Rotary spark gap
Hi Doug,
I would urge you to consider using a static gap until you are an
experienced coil builder. There are many pitfalls to successfully
designing a coil using a rotary gap that are not evident to beginners.
Advice is often given recommending that NST powered coils use only a sync
RSG. I don't think there is anything inherently wrong with using an async
RSG with an NST. The real danger is using a variable speed motor and
running at too low an RPM that the cap doesn't discharge every half cycle.
The voltage builds on successive cycles until either the cap or NST
insulation breaks down from over-voltage. A properly set safety gap would
protect against that, but the discipline to correctly set that is uncommon.
13,000 RPM? The speed for a sync RSG is only 1800 or 3600 RPM, so you'd
have to throttle that way down, and risk going too slow.
Regards, Gary Lau
MA, USA
On Mon, Sep 17, 2018 at 7:52 PM doug <doug11642@xxxxxxxxxxx> wrote:
I am building a rather small TC for [Ross Reynolds] a physics prof. at
GVSU here in Allendale Mi. I have a sewing machine motor that turns at 13K
– plus, under no load and would like some design ideas for using it to
build a rotary spark gap for the little {demo} coil please.
To give you some idea on the coil/ NST = 7.5/30, MMC = 18K X 5.2 nf, top
load = 1.5” X 6” toroid.
Any help you give me will help to inspire some students {maybe}!
This coil, by the way, is a gift to my friend Ross!
Doug J.
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