All,
I am not sure if this is of interest, since the original request was for
bockwurst shaped collectors, however....
I have had some topload shells made at my friendly local spinning shop,
they are made from 1,5mm alluminium, and 360mm in major diametre.
Top part is a nice fat squat half-pseudosphere, bottom part curves in
from equator to 90 degrees with a 60mm radius, then transmorphs into a
40mm radius for 90 degrees up into the hole, which consequently attains a
160mm diametre.
Functions well with a 80mm wide belt on a Ø 100mm pulley, and running
this at 3000 rpm has delivered +60µA, with downbelt charging comb in
place.
If there was a sufficient interest, I could run a batch.
Price 300USD + shipping from Denmark
Cheers, Finn hammer
----- Original meddelelse -----
> Fra: Matthew Sweeney <msweeney23@xxxxxxxxx>
> Til: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Dato: Ons, 08. feb 2017 20:23
> Emne: Re: [TCML] VDG Collector
>
> I ran into this same problem, but I found a cheap and easy solution
> that
> seemed to solve the problems for me:
>
> 1. Make sure the collector is approx 4-5 feet off the ground, away
> from any
> areas that could contribute to leakage (such as the motor, any sharp
> points
> etc.)
> 2. Cover the edges of the hole with electrical tape, then press on a
> small
> soft vinyl tube cut lengthwise.
> 3. This is the important part - Find some form of 1 inch wide rubber
> material, thicker if possible, and wrap it tightly around the top of
> the
> column right where it enters the collector, so the entrance hole is
> 'sitting' on it. The goal is to create a torus of sorts where the
> collector
> can rest. I went for about 1 inch depth but I don't remember the
> exact
> number of turns.
> 4. Now wrap the rubber torus with electrical tape (tightly) to keep
> it nice
> and solid and also to reduce any sharp edges. You really want to do a
> good
> job here the end result should look like a smooth solid torus made of
> electrical tape.
>
>
> This seems to create a corona ring of sorts, but of course this is
> non-conductive - I don't know why it works so well, but it completely
> solved any leakage problem I was having.
>
> Matt
>
>
> On Wed, Feb 8, 2017 at 5:26 AM, ExtremeElectronics.co.uk <
> tesla@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > The biggest issue, is the hole where the belt comes through. If you
> can
> > make that a gradual curve, or can make the belt small in relation
> to the
> > diameter of the bowls they are great.
> >
> > My design has the down side of a large belt-hole and a not very
> well
> > smoothed entry, If I could improve this I would get a much better
> output.
> > Although on a good day It will arc from top to bottom, roughly
> 800mm
> >
> > I can't say what the change rate is, I did measure it when I built
> it, and
> > I've improved the charging a number of times since, but I can't
> find any
> > reference to the figures in my notes.
> >
> > The motor is small Como drills 191D, 12V ~ 3A, geared 2:1, but has
> plenty
> > of power for the job, the belt runs at around 3M/Second flat out.
> >
> > Derek
> >
> >
> > On 08-Feb-17 02:51, Matthew Sweeney wrote:
> >
> >> I've been able to get 3 foot sparks using two of those 14" Ikea
> bowls..
> >> They work extremely well.
> >>
> >>
> >>
> >> On Mon, Feb 6, 2017 at 6:38 PM, Ed <evp@xxxxxxxxxxx> wrote:
> >>
> >> Awesome! Looks like a small motor - how long does it take to
> charge
> >>> enough for a spark? Have you measured the output current?
> >>>
> >>> Ed
> >>>
> >>>
> >>> On 2/6/2017 2:27 PM, ExtremeElectronics.co.uk wrote:
> >>>
> >>> I made mine from two Ikea bowls, a sheet of aluminium and loads
> of
> >>>> filler.
> >>>>
> >>>> http://www.extremeelectronics.co.uk/static-machines/1mv-van-
> >>>> de-graff-project-2/
> >>>>
> >>>> Commercial ones like that would cost a fortune to manufacture.
> Your only
> >>>> other option would be see if they sell spares. Or contact a
> friendly
> >>>> metal
> >>>> spinning shop.
> >>>>
> >>>> Derek
> >>>>
> >>>>
> >>>> On 06-Feb-17 20:39, doug wrote:
> >>>>
> >>>> Can anyone tell me where I might find a sausage shaped top load
> like the
> >>>>> one pictured in this website?
> >>>>> http://wikivisually.com/wiki/File:Van_De_Graaff_gen_03.jpg
> >>>>>
> >>>>> Doug J.
> >>>>> _______________________________________________
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> >>>>> Tesla@xxxxxxxxxx
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> >>>>>
> >>>>> _______________________________________________
> >>>> Tesla mailing list
> >>>> Tesla@xxxxxxxxxx
> >>>> http://www.pupman.com/mailman/listinfo/tesla
> >>>>
> >>>>
> >>>> _______________________________________________
> >>> Tesla mailing list
> >>> Tesla@xxxxxxxxxx
> >>> http://www.pupman.com/mailman/listinfo/tesla
> >>>
> >>> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >
> > _______________________________________________
> > Tesla mailing list
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> >
> _______________________________________________
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Mvh. Finn Hammer
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