Re: VDG (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: <sroys@xxxxxxxxxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 26 Feb 2005 09:20:43 -0700
From: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: VDG

Gordon; The top roler and comb is used to charge the charge collecting
sphere  The use of a metal roler at this point is reasonable as everything
is at a common charge point. This is not the case at the bottem, Part is at
ground potential , The comb is at 4-5 Kv so a metal roler at this point
would be subject to short circuit problems of differing potentials. Metal on
top, fine. Plastic on bottem, fine. Metal on bottem, NOT GOOD.
    Robert   H
-- 


> From: "High Voltage list" <hvlist@xxxxxxxxxx>
> Date: Fri, 25 Feb 2005 22:12:25 -0700 (MST)
> To: hvlist <hvlist@xxxxxxxxxxxxxxxxx>
> Subject: VDG (fwd)
> Resent-From: hvlist@xxxxxxxxxx
> Resent-Date: Fri, 25 Feb 2005 22:12:27 -0700 (MST)
> 
> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Fri, 25 Feb 2005 14:27:44 -0000
> From: Gordon Forrest <gmforrest@xxxxxxxxxxxxx>
> To: hvlist@xxxxxxxxxx
> Subject: VDG
> 
> Hello all,
> 
> I recently bought a 400kV VDG and have a few questions.
> 
> First of all, the only reason I bought a complete one was the
> difficulty/expence of a sphere in the UK and the good exchange rate £ to
> $
> at the time.
> 
> I want to run it with a –ve charge. The problem is that the bottom
> roller is
> plastic and the top is metal. Do I need to change them round or can I
> just
> use a –ve spray charge on the bottom? Would a 5kV for a laser do?
> 
> Also is it possible to remove the top sphere ( 14” ) and connect it with
> some
> ½” copper pipe to the upper collector point?
> 
> Gordon
> 
> 
> 
>