Re: Wimshurst machines (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 16 Nov 2003 01:11:30 -0600
From: D.C. Cox <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Wimshurst machines (fwd)


I use electrostatic conductive foam that is used to cancel charges on PCB
boards when they are shipped.  Clamp between two large washers.  It's easy,
works well, and is very inexpensive to replace as they slowly wear out.

Dr. Resonance



----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Saturday, November 15, 2003 5:21 PM
Subject: Re: Wimshurst machines (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Fri, 14 Nov 2003 22:11:44 -0200
> From: Antonio Carlos M. de Queiroz <acmq@xxxxxxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Wimshurst machines (fwd)
>
> High Voltage list wrote:
>
> > From: Finn Hammer <f-h@xxxx>
>
> > I use very soft and thin wire for the brushes too. But it annoys me if
> > these wires drag marks around the disk, by touching the disk itself, so
> > i had holes drilled in the narrow end of the sectors, threaded them, and
> > put small screws in them, so that the brushes touch them, not the disk.
> > It is just another way of making the small bump that is often made on
> > sectors, if they are made from foil, and glued or waxed on to the disks.
>
> Now I understand, and also the problem with sparking between the disks
> caused by the screws. You can prevent the sparking by fixing disks of
> thick adhesive vinil foil over the holes, at the internal side. Two
> layers to be sure. I like to make brushes with thin nickel-chrome wire.
> They don't leave residues. I am now trying to wrap these wires around
> silk threads, fixing with some glue. The wires resist much more time
> in this way.
> I have made sectors with bumps using aluminum plate. Much more difficult
> than with thin foil, but works. Long bumps also guarantee contact with
> the neutralizer brushes. Buttons tend to drive them to the sides.
>
> > I have a picture of one spare disk here, without screws, but with holes.
> >
> > http://home5.inet.tele.dk/f-hammer/wimshurstdisk.jpg
> > Battery in the center is a AA for size.
>
> Nice. You could try to remove the labels from the disks.
>
> Antonio Carlos M. de Queiroz
>
>
>