Re: Pri/Sec spacing

Subject:  Re: Pri/Sec spacing
  Date:   Sun, 8 Jun 1997 10:46:25 -0600
  From:  "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
    To:  "Tesla List" <tesla-at-pupman-dot-com>

TO: William Noble

It is not necessary to use any plex to provide pri-sec insulation.  With
4" coil start the bottom on your sec. winding 1.5 inches above a
line drawn thru the top of the primary (ie, this line is higher for
strap than copper tubing due to the straps higher profile).  Use a flat
spiral primary for this type of coil.  Pri-sec spacing should be 1.5 to
1.75 inches.  With this configuration no arc over and no plastic

Would also suggest a 24 inch winding length with the 4" dia.  12 x 3 or
x 4 top toroid.  15 turn primary (can be tapped as necessary), .01 MFD
60 ma drive or .02 with 120 ma drive.  Will produce 32-34 inch sparks
.02 MFD and 120 ma drive.  Use 20 turn primary if you are using a .01
4 electrode RSG synchronous at 1800 RPM for best results.  (old RTTY
machine motor)


> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: RE: Pri/Sec spacing
> Date: Saturday,June 07,1997 6:15 PM
> Subject:  RE: Pri/Sec spacing
>   Date:   Sat, 7 Jun 97 06:33:43 UT
>   From:   "William Noble" <William_B_Noble-at-msn-dot-com>
>     To:   "Tesla List" <tesla-at-pupman-dot-com>
> I don't think the plexiglass will do much good.  I have wound my pri
> with 1/4 
> inch tubing on 1/4 inch plexiglass, with the inner turn of the primary
> routed 
> through a hole and back to the outer edge, so there is the plexiglass
> between 
> the feed line to the inner turn and the rest of the primary.  I noticed
> this 
> last weekend that if I let the feed line get close to the plexiglass, I
> would 
> get a significant corona between the outer turns and the feed line to
> the 
> inner turn.  This suggests to me that the insulation afforded by the 
> plexiglass won't do much to protect against a HV strike.
> ----------
> From:   Tesla List
> Sent:   Friday, June 06, 1997 6:36 AM
> To:     tesla-at-poodle.pupman-dot-com
> Subject:        Pri/Sec spacing
> snip
> I myself am still working on my first coil and was planning on
> mounting a flat 1/4" tubing primary BELOW a 1/4" x 2' x 2' sheet
> of plexiglass, and mounting the secondary above the sheet.  This
> would seem to afford some good protection against primary strikes
> and at the same time, make primary tap adjustment very
> accessable.  As I am now preparing to start on my secondary
> (4.25" x 20"), I'm wondering how close to the end to start my
> winding, and whether I might not be able to get the secondary
> close enough to the primary using this geometry.
> snip
> Gary Lau
> Waltham, MA