Re: van de graaff tube (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 29 Nov 2004 15:53:36 -0000
From: colin heath <colin.heath4@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: van de graaff tube (fwd)

hi all,
        thanks for the reply. i will be using a sprayed bottom roller as i
live here in rainy old britain so i wanna be able to use most of the time.
if the blacks gonna be a prob ill go for something else as i want this to
work then again i suppose i can just rub it as somebody else suggested to me
and see if it holds a charge. its not normal drain pipe but the inner from
our rolls of poly bags at work
cheers
colin
----- Original Message -----
From: High Voltage list <hvlist@xxxxxxxxxx>
To: hvlist <hvlist@xxxxxxxxxxxxxxxxx>
Sent: Monday, November 29, 2004 3:42 PM
Subject: Re: van de graaff tube (fwd)


> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 28 Nov 2004 23:18:21 -0600
> From: Dr. Resonance <resonance@xxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: van de graaff tube (fwd)
>
>
>
> Assuming you are spraying the lower pulley at 5-7 kV DC, the 2.5 inch wide
> belt will deliver charge to the upper terminal at an approximate rate of
> 12-15 uA DC.  If you are using a self-excited design, the max charge rate
> will be approx 3-4 uA DC.
>
> A gray PVC tube will leak at approx 1 uA downward.  A black PVC tube will
> leak at 2.5 uA DC downward, so the black will not work.  Your HV terminal
> will not acquire a charge.
>
> Use a gray tube, schedule 40 PVC, and apply 3 coats of red gylptal inside
> and outside prior to using the tube.  Also, be sure to sand the tube
inside
> and outside prior to coating to remove any carbon particles (impurities)
> that would cause additional downward leakage.
>
> A 16 inch sphere will produce approx 450 kV at the top terminal.  Keep the
> tube length to at least 40 inches long so surface tracking at this
potential
> will not become a problem.
>
> Happy Holidays,
>
> Dr. Resonance
>
> Resonance Research Corporation
> E11870 Shadylane Rd.
> Baraboo   WI   53913
>
>
> >         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
> >
> >
> >
>
>
>
>