Re: [TCML] NST's and ARSG's

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

My bad.

On Wed, Jun 11, 2008 at 8:34 AM, Lau, Gary <Gary.Lau@xxxxxx> wrote:
> I didn't follow:
>> it was firing every time the gap came into phase
> An async gap fires at random phase.

It seems to drift close to being in phase then away from it due to the
slip in the motor.  As it comes closer to being in phase the volume
increases and I get longer streamers.  Then it will drift farther away
from the phase of the power and streamer length decreases.

And:
>
>> maybe I shoudn't have been running in the air

I'm referring to the NST.  I haven't potted it or submerged in in oil
yet.  This is mainly because the transformer keeps giving me trouble
like this.  I'm beginning to hate NSTs they seem so fragile.

> ?
>
> Running with a smaller than resonant cap may be a problem unless you're very sure that the break rate never got too low.

Could be the problem then.  I'm not breaking at exactly 240 BPS and I
have doubled the power that I initially tuned the circuit for.
>
> Regards, Gary Lau
> MA, USA
>
>> -----Original Message-----
>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>> Behalf Of Phillip Slawinski
>> Sent: Wednesday, June 11, 2008 8:46 AM
>> To: Tesla Coil Mailing List
>> Subject: Re: [TCML] NST's and ARSG's
>>
>> Well my ASRG is set up to run over 120BPS  should be around 200BPS.
>> I've got a saftey gap, and I had it set pretty close, it was firing
>> every time the gap came into phase.  Maybe my NST has been weakened,
>> maybe I shoudn't have been running in the air.  I do have a smaller
>> than resonant cap, but I thought that would be okay since I had the
>> gap set to break at ~240BPS.
>>
>> On Wed, Jun 11, 2008 at 6:48 AM, Lau, Gary <Gary.Lau@xxxxxx> wrote:
>> > Since this question is about neither wax nor Phillips (?), I changed the subject
>> line...
>> >
>> > I think that ARSG's may have been over-vilified.  I can see no mechanism where
>> having a too-high break rate would be stressful to an NST.  High break rates in no
>> way cause higher voltages, currents, or anything else that would damage an NST.
>> >
>> > What I suspect is that some folks ran their ARSG's at too LOW a speed, or
>> perhaps turned on the NST before spinning up the ARSG.  Having a speed control
>> knob on the RSG invites one to vary it too low.  This would be the same as opening
>> a static gap so wide that it never fires.  This would cause the cap voltage to ring up
>> to self-destructive voltages on successive mains half cycles, rather than being
>> discharged with normal gap firings.  Just ensure that the RSG is always running at
>> at least 120BPS.  And, ALWAYS ALWAYS ALWAYS (cannot be overemphasized)
>> use a properly set safety gap in parallel with an RSG - sync or otherwise.  They're
>> cheap and easy to build and there is no excuse not to have one.  You do have one,
>> right? ;-)
>> >
>> > Regards, Gary Lau
>> > MA, USA
>> >
>> > -----Original Message-----
>> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>> Behalf Of Phillip Slawinski
>> > Sent: Tuesday, June 10, 2008 11:56 PM
>> > To: Tesla Coil Mailing List
>> > Subject: Re: [TCML] phillips question about wax and more
>> >
>> > While we're on the topic of NSTs, ASRGs are pretty bad for them right?
>> >  It seems that my NST keeps shorting, and I think it's due to the
>> > ASRG.
>> >
>> > _______________________________________________
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>> >
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