Re: [TCML] Sputtering Gap

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

There is a good chance, the transformer is not damaged, checking the 
transformer should be no problem. But you will have to build a completely 
new MMC (replace ALL caps).

----- Original Message ----- 
From: "Tim Flood" <tfloodrr@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, March 28, 2014 1:53 PM
Subject: Re: [TCML] Sputtering Gap


I had some extra time last night so I went ahead and assembled my new TC.
You guys were right. As I increased the voltage the rotary gap begin firing
and sputtering. Increasing the voltage further finally resulted in a thin
white spark arcing from the toroid to a ground object. This lasted for a
few seconds then the whole system died. It got really quiet really quick.

Based on previous posts, would you recommend just going ahead and replacing
both the MMC's and the NST or is there another approach?

Thank you for any help.

Tim Flood


On Thu, Mar 27, 2014 at 9:33 AM, Tim Flood <tfloodrr@xxxxxxxxx> wrote:

> The capacitance value of the caps is right on the mark per the meter, but
> as you said under load they may not hold up. I'm still going to check out
> the NST later today. My plan is to go ahead and assemble the complete coil
> this weekend and see what happens. I hate the thought of throwing out a 
> new
> NST because of stupid.
>
> Another lesson learned.
>
> Tim
>
>
> On Thu, Mar 27, 2014 at 8:36 AM, Teslalabor <teslalabor@xxxxxxxxxxx>wrote:
>
> > The chances are very low because the symptoms you are telling us, are
> > typical for blown caps or transformers, when the SRSG suddenly stop 
> > working
> > well, the timing gets incorrect... Which is caused by blown transformers 
> > /
> > caps. Remember that only checking the capacitance of the caps is not very
> > "useful" because capacitance could be fine but the caps are failing under
> > load conditions...
> >
> >
> > ----- Original Message ----- From: "Tim Flood" <tfloodrr@xxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Sent: Wednesday, March 26, 2014 11:46 PM
> > Subject: Re: [TCML] Sputtering Gap
> >
> >
> > Thanks guys for the input. Sounds like I'm the dummy!
> >
> > I hope I didn't run long enough to due permanent damage. It was run that
> > way for only a few seconds, three times. The caps were not warm nor had
> > any
> > visible anomalies. I'll check the MMC value tomorrow and the transformer
> > output using a jacobs ladder. Everything is at work so I'll have to wait
> > until tomorrow.
> >
> > Thanks again. What are the chances Imay not have done permanent damage?
> >
> > Tim
> >
> >
> > On Wed, Mar 26, 2014 at 5:02 PM, teslalabor@xxxxxxxxxxx <
> > teslalabor@xxxxxxxxxxx> wrote:
> >
> >  Very Bad idea. When doing such Experiments you have to use at least a
> > > dummy load in Form of halogen bulbs, which replaces the primary. When 
> > > you
> > > simply Run it without secondary, you kill your caps and neon, i think
> > > thats
> > > what happened in Your case.
> > >
> > > Gesendet mit meinem HTC
> > >
> > > ----- Reply message -----
> > > Von: "Tim Flood" <tfloodrr@xxxxxxxxx>
> > > An: "tesla@xxxxxxxxxx" <tesla@xxxxxxxxxx>
> > > Betreff: [TCML] Sputtering Gap
> > > Datum: Mi., Mär. 26, 2014 21:25
> > >
> > > Could really use some help.
> > >
> > > Just completed a new 15/60 NST powered coil with a SRSG. With the tank
> > > circuit completely wired and the secondary removed I thought why not
> > > check
> > > the operation of the rotary gap. The first time I powered up it ran 
> > > fine,
> > > firing smoothly up to the max variac setting.
> > >
> > > Subsequent power-ups resulted in the gap sounding like gun fire. The
> > > safety
> > > gap on the SRSG is firing, the arcs at gap alignment vary in intensity
> > > and
> > > there are smaller arcs running around the conductor ring on the disc.
> > >
> > > The rotor is 5" diameter with four 1/8" carbide electrodes turning at
> > > 1800
> > > RPM.. There are two stationary electrodes on the front side. Electrode
> > > spacing is .030" per gap.
> > >
> > > Thank you,
> > >
> > > Tim Flood
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