Re: Secondary wire size concerns

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

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 12/12/00 10:43:28 AM Pacific Standard Time, 
tesla-at-pupman-dot-com writes:

<< Hello list,
 Last night I finished some planning on my first coil.  The secondary will be 
12
 inches high, 3 inches in diameter and will need to be wound with 31 AWG.  
That
 is .0089 inches in diameter (not including the insulation).  In theory (if
 wound perfectly) this would allow me to get 87.7 turns per inch for a total 
of
 1053 turns (insulation included).  Is this a common wire size used on
 secondary?  My transformer is a NST 7.5kv 20ma.  Should my secondary be 
taller
 and my wire size be larger?  If this set up sounds ok, how much taller 
should I
 make my secondary to account for the 'winding slop' that will inevitably 
occur
 on my first wrap job?
 TIA
 --Green Horn
  >>
Nathan, 

I have a 3.0" diameter secondary.  The form is 15" long with a 13" winding 
length.  This provides a 4.3 : 1 ratio.  I would not go too much more than 
that.  Maybe 14" or 14.5" winding length max.  My coil is wound with # 28 
wire for a total of about 920 turns.  Since I just re-wound this coil last 
weekend, it is still fresh in my mind.  I think # 28 is about as small as I 
would like to work with.  Other coilers have wound used # 31 or # 32 wire, 
but I would not like to do it.

Ed Sonderman