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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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