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RE: [TCML] Phase
The suitability of your gap width really depends upon the voltage of your power supply transformer. For my 15kV NST, my safety gap needed to be just shy of 0.5"!
As to how long a gap lasts, that would depend upon the power rating or your transformer. Are we talking about a bug zapper or a pole pig? It also matters what the primary current is, as governed by the primary inductance. A low inductance primary will be much harder on a gap than a high inductance one with the same xfmr. Tungsten rod diameter also plays a large role in longevity. Saying only that your previous gap was made of brass tells us very little. 1 inch thick brass rods with forced air cooling, or brass upholstery tacks, or...
Regards, Gary Lau
MA, USA
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of penny831@xxxxxxxxxxxxx
> Sent: Wednesday, November 28, 2007 5:14 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Phase
>
> I have mine set at a little less than .125 each and I was anticipating on setting the
> safety gap at about .200-.250. The SRSG spins nice and true and uses tungsten on
> both sides of the gap. How long do these things last anyways? My old static gap
> had 6 gaps made of brass and they would melt after a few months of on and off
> use.
>
> Tony
>
> -----Original Message-----
> >From: FutureT@xxxxxxx
> >Sent: Nov 28, 2007 2:06 PM
> >To: tesla@xxxxxxxxxx
> >Subject: Re: [TCML] Phase
> >
> >
> >Yes, the sync gaps should be set close. Especially with NST powered systems
> >a
> >wide gap will cause misfires and poor operation and can destroy the NST (if
> >a Terry filter is not used). In general wide gaps can cause misfires and
> >unsteady firing. The motors used for sync gaps should not have end play,
> >to prevent electrode crashes. The entire base and rotary gap structure
> >should be robust, also to prevent crashes. This is especially important
> >with tungsten electrodes which are brittle and expensive. Some of my
> >smaller rotaries can tolerate crashes, the electrode ends are rounded
> >slightly and just glide past each other even if they touch. The electrodes
> >are steel or copper, not tungsten. It may not be good if the electrodes
> >scrape past each other since it may promote "re-firing".
> >
> >John
> >
> >
> >In a message dated 11/28/2007 2:45:50 P.M. US Eastern Standard Time,
> >Gary.Lau@xxxxxx writes:
> >
> >I've never viewed adjusting the gap spacing as a tuning or tweaking
> >parameter, believing that it should simply be made as narrow as possible without
> >risking a crash. If it is too wide or marginally too wide, the gap may misfire,
> >especially if it is run at less than full power. Assuming there is no danger
> >of a crash, why shouldn't the gap be made as narrow as possible? Yes, the
> >gap will fire before the actual mechanical alignment, but this of no
> >consequence.
> >
> >For synchronous gaps employing LTR caps, the actual optimal firing point is
> >not at the peak capacitor voltage (which would seem intuitive), but rather
> >sometime later. The explanation for this is lengthy (inductive kick effect),
> >but Richie Burnett does an excellent job on his web site page
> >http://www.richieburnett.co.uk/indkick.html#kick. It's just one of those things that
> one
> >needs to try and scope for yourself.
> >
> >Regards, Gary Lau
> >MA, USA
> >
> >> -----Original Message-----
> >> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> >> Behalf Of Chris Swinson
> >> Sent: Wednesday, November 28, 2007 12:02 PM
> >> To: Tesla Coil Mailing List
> >> Subject: Re: [TCML] Phase
> >>
> >> Hi Tony,
> >>
> >> Keep the motor off, but keep the electrodes aligned, see if the tank volts
> >> gets high enough to jump the gap. If it does then make the gap wider and
> >> keep going. Then you need to physically move the sync motor while it is
> >> running. The spark gap should only fire within a few degrees of manual
> >> adjustment. mark the points from left to right where the spark gap stops
> >> conducting then you have your centre point which will be the top of the AC
> >> cycle. You can then adjust your gaps wider if needs be once you have worked
> >> out your gap fire.
> >>
> >> If your gap does not fire while the motor is running then just close them
> >> down a fraction and try again..
> >>
> >> Hope this helps..
> >>
> >> Chris
> >
> >
> >
> >
> >
> >
> >
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