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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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