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Re: [TCML] crowned pulleys
I have to say here that, although I have been having difficulties with the
VDG I have built lately and I am no expert,
I cannot accept this statement without some other caveats. As a teenager
back in the last century (Ooo, doesn't
that make me sound old) I cobbled together an 8" tall machine with a 3"
sphereish top and a 1/2" rubber
band on 1/2" pulleys. I was able to generate 2" sparks with that little
thing without an electron spray.
Inch for inch the best performing thing I have ever made. I am guessing
that if one were trying to charge a 24" sphere
with a relatively small belt and pulley then the leakage could over whelm
the accumulated charging.
So there must be some other factors involved here.
Russell @ the Cape
Subject: Re: [TCML] crowned pulleys
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Ed is right.
A 1 inch wide pulley will only give you approx 3/4 uA charging current
which
will leak back down your column (leakage current is important in VDGRF
design) and not allow the HV terminal to build up any large potential.
Also, for best performance, you need a metal not a plastic pulley, and
preferably a positive sprayed 7 kV DC power source
I use a 6" wide belt with a 24" sphere and jump to 10" width for my larger
30" and 40" spheres.
Dr. Resonance
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