Re: Coil Form needed 2

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

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Dr, R     I have  purchest up to 40 in PVC thin wall white 1/4 thick with no
layers or other variat ions in Albuquerque. Very good quality. Check with
your dealer  to get good quality. I just got 14' grey for a telescope tube
1" thick with no layers.
        Robert    H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Sun, 16 May 2004 20:57:34 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Coil Form needed 2
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Sun, 16 May 2004 22:22:47 -0600
 >
 > Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, May 15, 2004 8:36 PM
 > Subject: Re: Coil Form needed 2
 >
 >
 >> Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >>
 >>
 >> Experimenters should use caution when trying to use large PVC pipe as a
 >> coilform.  We used PVC pipe coated with 3 coats Glyptal inside and outside
 >> for our line of VDGRF generators.  As soon as we crossed the 10 inch dia.
 >> threshold the VDGRFs stopped operating properly (3 inch spark from a 40
 > inch
 >> dia. terminal) even though the small 6 inch ID PVC pipes worked great up
 > to
 >> 750 kV DC.
 >
 > I wouldn't be surprised if the larger sizes of pipe have nonuniform plastic
 > in the wall.  I was turning some white PVC pipe (4"_ on a lathe and
 > discovered that only the outer layer was actually white, and the inside was
 > sort of grayish.
 >
 > I don't know how they make the stuff (extrusion probably), but it's entirely
 > possible that they extrude a "nice clean" layer on inside and outside of the
 > pipe.
 >
 > For what it's worth, if you look at ABS DWV (the black stuff used for
 > sewers), you'll see that it's actually a foam in the middle of the pipe
 > wall.
 >
 >