Re: [TCML] Pre-Launch Prep Procedure

[W5als <w5als@xxxxxxxxx>]

Hi
    On my 6 in coil when I take it out of tune the safety gap would do that but
not at 50 volt, but when I play with the spark gap and got it to open it did
What you are saying at 75 volts. Your spark gap may be to far apart.
Just my thoughts but there are other things that can cause this problem too.
Alton

Sent from my iPad

On Jul 12, 2013, at 3:50 PM, Mike Gray <graymp89@xxxxxxxxx> wrote:

> NST is 10kV 50mA, and my cap is designed to approx 41nF. However I have no
> way of measuring it so I can't be sure. My multimeter says it can measure
> capacitance but I can't figure it out, I think it's more a gimmick selling
> point than a real measurement function. The 41nF is the optimum larger than
> resonance value for a sync gap, according to TeslaMap. My cap array is 7
> strings of 8 of these:
> 
> http://media.digikey.com/pdf/Data%20Sheets/Kemet%20PDFs/PHE450SD5470JR06L2.pdf
> 
> 
> On 12 July 2013 19:59, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:
> 
>> What size is your NST and cap?  You may be getting resonant rise, in which
>> case your safety gap is doing its job.
>> 
>> 
>> 
>> 
>> ________________________________
>> From: Mike Gray <graymp89@xxxxxxxxx>
>> To: Tesla Coil Mailing List <Tesla@xxxxxxxxxx>
>> Sent: Friday, July 12, 2013 1:36 PM
>> Subject: [TCML] Pre-Launch Prep Procedure
>> 
>> 
>> Hi all. I'm having some trouble sorting out the correct pre-launch
>> preparation, specifically the Terry safety gap. What I currently believe to
>> be correct is this. In order to set the safety gap to just wider than the
>> max arc width the NST can produce, I first of all disconnect everything
>> else from the safety gap except for the NST. I then narrow the safety gap
>> so that it fires when the NST is fired up. I then gradually widen the gap
>> whilst at the same time firing up the NST, looking for the point at which
>> the NST can no longer produce an arc between the gaps. When I get there, I
>> leave the safety gap in that exact configuration for TC operation.
>> 
>> Trouble is, when I then go to energise the TC itself with everything
>> connected up again, the safety gaps fire when I'm at around 50-60% on the
>> variac. I can't understand how this happens!
>> 
>> So I thought maybe it's best to set the safety gap width with the rest of
>> the TC hooked up rather than in isolation. But then what to do with the
>> main gap (SRSG)? I've tried removing just the SRSG, and with the rest of
>> the TC hooked up try to set the safety gap width. In this case it started
>> to fire less frequently and with louder arcs each time I made it wider, and
>> this didn't sound right so I stopped. Thought it best to ask for advice
>> before I explode something...!
>> 
>> So what's the best way to set up the safety gap?
>> 
>> Cheers guys.
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