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Re: [TCML] Re: Toroid
I use two brass pipe fittings facing one another, and the air blows through them. I can use my shop vac to blow or suck through them, but get best results with it blowing.
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From: Carl Noggle <cn@xxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Monday, October 1, 2012 1:37 AM
Subject: Re: [TCML] Re: Toroid
My guess is that you will see MUCH better performance with the shop vac. I have a vacuum cleaner motor on mine, and if it isn't on, there ain't nothin. You want that gap to have lots of hard, blue-white sparks and a lot of obnoxious noise. My experience is that you can't have too high an air velocity, but it has to be above a certain point. A vac should give you enough velocity. A good choice for electrodes is brass acorn nuts from the hardware store. polish them a bit with fine steel wool. You want nuts that are of a radius roughly equal to the gap spacing. Too big a radius may impede the airflow due to Reynolds' number problems. Too small a radius and the gap will go into corona before it fires properly.
---Carl
-----Original Message----- From: Christian Hill
Sent: Sunday, September 30, 2012 3:59 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Re: Toroid
Hello. It is a static spark gap that was (probably poorly) quenched by a
computer case fan but is now unquenched. The fan burnt up the other day. I
can easily set up the shop vac to quench the gap. I would imagine that
changes in quenching will require changes in tuning, correct? I noticed a
reduction in arc length when the gap was quenched by the shop vac versus
when it was unquenched. The new toroid is 29" in total diameter with a 4"
ring. Aluminum dryer duct only seems to come in the 4" variety. Where can I
get some 6" diameter or larger flexible tubing? Thank you.
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