Newman machine replica

[maxc]

Use brushes off a very small motor.

If I tune mine right i get 2mm arcs off the brushes with a 6 volt battery.
I have 10 pounds of 20 gauge wire now 30 ohms, still not enough wire.

[Thaelin]

   Number 20 wire is a bit big. I am just ready to start winding mine and its using 26. I have around 9000 ft of it so it will have to do.

   Here is an idea I will be using for the comm. Instead of using tape on the shaft, tape it all the way around and then tape a piece of say 18 ga wire on it and ground to the shaft. Will see how well it fares

sugra

[Dingus Mungus]

Anyone know of cheaper/better wire venders?
http://www.electromechanicsonline.com/default.asp?cat=Wire%2C+Magnet

I'm looking to buy a big spool if you know what I mean.

~Dingus Mungus

[pg46]

Hi

You might want to have a look at this guy's experiments regarding a gain in voltage on account of the sparking over at -

http://www.intalek.com/Index/Projects/SparkGapExp/SparkGapExp.htm

Very tidy and well laid out work.

He is using  Carbon/Graphite and  Thoriated Tungsten rods for contact points.  You can get these at welding shops. The Carbon/graphite rod looks like a common gouging rod.

I am trying now on my motor with carbon rod from an old dry cell battery and this thoriated tungsetn rod. Don't know that it will make my experiment self sufficient but the spark is real pretty if nothing else - kind of a purple color.

[hartiberlin]

Hi Dingus,
if you go with the reciprocating setup, where a magnet just slides in and out of the coil,
you have to make this circuit like a door ringer bell.
So connect one contact point to the bottom of the magnet and the other
beneath it.
So if the magnet falls into the coil it makes contact and the coil
repells the magnet out of the coil and the contact is broken, so the magnet
again falls back down making contact again and is repelled again out of the coil.

If you go with the rotating setup, you just need to make
contact once per revolution of the magnet at the right angle.
So you stick the contact to the axis via a commutator.
Pretty simple. No higher mathematics needed !  

Regards, Stefan.

P.S: Replace the 10 ohm shunt with a incandescent bulb.
The shunt was only there for the scope measurement for
to see the back current spike on the scope.

So I tested the reciprocating version first just to see a simple proof of concept.
Its a 12v 4ah backup battery, 200 feet of 30g wire, and two 1"x.25" neo cylinders.
From positive terminal the coil begins and the last 2 feet were left to connect to the
floating magnet. Once the magnet is levitating on the other magnets field you can
add a tin foil contact in the tube between the magnet and the negitive terminal, when
gavity pulls the magnet down it closes the circuit and the magnet is repulsed up the
tube. When it falls back to its start position it creates a high frequency BEMF pulse
that will really mess with your meters sometimes. An interesting proof of concept.

~Dingus

Welldone Dingus,
so did you have a look at the input current via a shunt resistor
and a scope ?
How does the input current look alike in this setup ?
Can you see a back current RF burst when you contact points
open ?

Regards, Stefan.