Re: Successful run!, rotary gap questions

• To: tesla-at-pupman-dot-com
• Subject: Re: Successful run!, rotary gap questions
• From: FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 12 May 1999 17:48:06 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 99-05-12 06:34:00 EDT, you write:

<< I am thinking of making a rotary
> gap, but I am wondering what the difference is between a synchronous, and
> non synchronous?  Can I use a standard 125vac 1/4 hp. motor?  How many
> points should I have on the disc?  Thank you for the responses, and I plan
> on adding a few more turns to the primary (boy, the pipe is expensive!).
> Once again, thank you
 
> -Andy
  >>

Andy, 

A nonsync gap should not be used with NST's.  A nonsync motor
can spin at any random speed whereas a sync motor runs at a multiple
of 60 Hz, and locks to the AC line.  A sync gap will fire at the same
spot on the 60 Hz ac half cycle everytime.  A 1/4hp, 1725 or 1750 rpm
motor can be modified by filing 4 flats onto the armature (really the
squirrel cage rotor), then it will run at exactly at 1800 rpm.  There
have been a number of postings lately discussing these modifications,
etc.  For 120 bps, use 4 spinning electrodes, and 2 fixed ones.  

If you use a sync gap, the capacitor size becomes more important
than in a static gap TC.  Also the capacitor may need to be rated
at a higher voltage depending on whether you use resonant charging,
etc.  Much has been posted on these issues over the last month, etc.
The archives have a wealth of data.

John Freau

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