Re: Plexiglass Form

To: tesla-at-pupman-dot-com
Subject: Re: Plexiglass Form
From: Richard Hull <hullr-at-whitlock-dot-com>
Date: Fri, 13 Sep 1996 11:27:44 -0700
Tesla List wrote:
> 
> >From Benson_Barry%PAX5-at-mr.nawcad.navy.milThu Sep 12 20:38:39 1996
> Date: Thu, 12 Sep 1996 06:48:00 -0400 (EDT)
> From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil
> To: tesla-at-poodle.pupman-dot-com
> Subject: RE: Plexiglass Form
> 
> I sealed my pvc coil form ends with epoxied plexiglas discs and filled the
> inside with dry nitrogen gas.
> The discs were shaped so that they fit inside the tube and had a 1/2" rim
> for easy winding.  The end
> wires were brought out through holes in the disks and laid along a radial
> groove in the disk surface
> (endmill).  The bottom stud was brazed to a rectangular piece of brass.  The
> bottom coil disk
> consisted of two plexiglas disks glued together (acetone).  This bottom of
> the top disk was milled
> out to accomodate this rectangle.  The end of the bolt with the rectangular
> piece was put
> through a hole in the bottom disk and attached with a nut and washer and to
> the lower coil wire.
> The top disk was then glued on top of this disk locking the square brass
> stud holder in place.
> A little epoxy was also added to the rectangular space around the brass
> piece to keep it tight.
> After this hardened the disk assembly was glued to the pvc tube.  This
> procedure was repeated
> on the HV end with a longer bolt and 6" bee hive insulator.  I have pulled 4
> 1/2' sparks from
> the resulting 27" coil form without any tracking problems on the inside.
> DATA:  27" pvc tube and winding length
>      5 lbs or 1000 feet of #18 B&S gauge magnet wire--MWS heavy formvar
>      coating: 5 cans of krylon acrylic spray
>      resonant frequency: 250khz,  200khz with 5X20 toroid
> 
>                                         Barry
> 
> |From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
> |To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
> |Subject: Plexiglass Form
> |Date: Friday, August 16, 1996 11:15PM
> |
> |<<File Attachment: 00000000.TXT>>
> |From SSNSanders-at-aol-dot-comFri Aug 16 13:37:13 1996
> |Date: Fri, 16 Aug 1996 14:30:00 -0400
> |From: SSNSanders-at-aol-dot-com
> |To: Tesla-at-pupman-dot-com
> |Subject: Plexiglass Form
> |
> |The form I have the merchant says is cast. I used a hole cutting bit in the
> |drill press to cut a cap for the top and a 6 inch base plate for mounting.
> |Both plates will have a hole in the center but no wires on the inside of
> the
> |form. Is this an OK design or should I seal the holes completely. Also what
> |would be the result of evacuation of the form and putting in neon, any
> |adverse effects?     Steve


Steve,

Stop here!!  Use atmospheric pressure air only in a coil form.  Neon is 
just itchin' to be ionized and conducts RF currents very well from 5mm 
pressure to 1.5 atmospheres.  It would be a pretty display though if it 
were of clear plastic or glass.

Richard Hull, TCBOR