Re: van de graaff tube (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 28 Nov 2004 22:42:45 -0500
From: David Speck <dave@xxxxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: van de graaff tube (fwd)

Colin,
7/16 wall thickness (almost a half inch!) is a lot thicker than typical 
drain pipe (usually about 3/16"), so this is unusual material 

If you have a neon sign transformer, try running leads to point 
electrodes, one inside and one outside the tube, a couple of inches in 
from the end.  If you get arcs to the tube, then the material is 
probably too conductive to work for your VDG.  If the plastic holds off 
the NST, then I'd think there's a good chance it might work for your 
VDG.  No guarantees, but a quick and dirty test, and worth a try.. 

HTH,
Dave

High Voltage list wrote:

>Original poster: <sroys@xxxxxxxxxxxxxxxxx>
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>---------- Forwarded message ----------
>Date: Sat, 27 Nov 2004 18:00:44 -0000
>From: colin heath <colin.heath4@xxxxxxxxxxxx>
>To: High Voltage list <hvlist@xxxxxxxxxx>
>Subject: van de graaff tube
>
>hi all,
>        i was given some tube from work which is 7/16" wall thickness so i thought i haver rollers waiting and this is perfect for mounting the rollers on. so my question is, this stuff is black pvc (i think) but worst case it could be conductive! will this affect things? im guessing it wont as nothing will be touching it but you never know. i know black pvc works fine as a tesla coil former but this is a different beast. i will be aiming for 2.5" wide belt and this stuff is 4" and i hope to have 16" sphere on top.
>any help much appreciated
>cheers
>colin heath
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