RE: Tesla coil grounding and other questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

Hi Luke,

On 17 Feb 2004, at 17:03, Tesla list wrote:

 > Original poster: "Luke" <Bluu-at-cox-dot-net>
 >
 > Is 0.25" the average distance coilers use for primary wire spacing?
 > Or is there a rule of thumb used?  Does power level play a roll in the
 > spacing?  Yes I know that there does need to be enough room for what
 > ever method is being used for connecting to the coil.

In the end, the minimum spacing required boils down to a volts/turn
relationship. For a flat spiral, this increases as one moves from
inner to outer turns since voltage is distributed according to
inductance and the outer turns, being longer, have more inductance
than the inner turns. I used much less turn-turn spacing than 1/4" on
one of my primaries and more on others.

Malcolm

 > thanx
 >
 > Luke Galyan
 > Bluu-at-cox-dot-net
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Tuesday, February 17, 2004 12:11 PM
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Tesla coil grounding and other questions
 >
 > Original poster: Esondrmn-at-aol-dot-com
 >
 > In a message dated 2/15/04 5:28:47 PM Pacific Standard Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 >  >Hello Gary. Your name has come up alot! More than one person has
 >  given
 > you
 >  >name as a site to check out! I did check out the mini-table top coil
 >  >section of your site and I must say the pictures and text are
 > excellent!
 >  >Very well done.
 >  >
 >  >As you may have gathered from my other post I plan to start from
 > scratch
 >  >and build a 4 or 4.25" secondary coil using my 12kv NST. Looks like
 >  I
 > will
 >  >buy some MMC caps on ebay if I can find them or from the Geek site.
 >  > >I found a site that explained why a helical coil isn't as good as
 >  a
 > spiral
 >  >coil. At first it sounds like you would want max coupling to get the
 > best
 >  >energy transfer but I guess that doesn't take into account charge
 > times,
 >  >field collapse times, etc.
 >  >
 >  >The 1/4" tubing sounds like a good idea but is 25' enough? I don't
 >  know
 > how
 >  >to figure out how much pipe is needed for x turns because it is a
 > spiral.
 >  >I'll have to experiment with that.
 >  >
 >  >Thanks for your input.
 >  >
 >  >JC
 >
 >
 > JC,
 >
 > If my calculations are correct, a 50' roll of .25" tubing with .25"
 > spacing between turns and an inside diameter of 6.25" should just
 > provide about 10 turns.  I would advise splicing on more and going
 > with 12 to 14 turns. You will loose a foot or so from the 50' length
 > if you bend the free end of the inside turn so it goes down under the
 > primary for connection to the cap and gap which most of us usually
 > mount down below.
 >
 > Ed Sonderman
 >
 >
 >