Hi Sarah2009,
Welcome!

This is interesting what you say about the layer between layers.
Lasersaber used tee shirt material and I used a thin cotton cloth. His is thicker than mine.
I do not know what lidmotor used for the layer of cotton, but they both got theirs to work and I have not yet.
Mine is not as thick, but it is thick enough to get some magnet pulses going, and I am not at all sure that I do get any magnetic pulses.

I do not know what is wrong with mine.
I think it is a combination of the coil and the rotor, and it is so much work to get either to work, I have become discouraged.

Do you have a working stubblefield coil?

thank you,

jeanna

Quote from: sarah2009 on September 28, 2010, 03:55:18 PM
Hi everybody

To show that its possibly the bifilar arrangement that makes the Stubblefield coil special,
and not so much the galvanic battery, consider this article from the JL Naudin website

http://home.comcast.net/~onichelson/VOLTGN.pdf

Kind regards

further confirmation of bifilar.....Stubblefield's galvonic bifilar obviously an interesting twist isn't it? Interesting point on 2 tesla pancake coils in near vicinty btw... multi-layered Stubblefield coils, especially those reproductions which employ a 'there and back again' winding direction through multiple coil layers  do not compute with me. I would love for induction coil expert to set me straight on this one. My simple experiments indicate stronger magnetic field occurs with same direction winding philosophy. Or crudely put, better ability to pick up paperclips. Induction into a secondary also obviously better. There are optimization opportunities available. I guess I will start building again...

Regarding oscillation aspects...You are correct. There can be no other possibilities.

Your input very most welcome here. I look forward to hearing more

@all,

       It's time to celebrate a little Ha ha.     

Today I continued to build my Stubblefield Coil Winding machine, The chain drive setup gave me a little bit of curry, but it wasnt long before I sorted that out.
The chain at times wanted to jog around a bit, it turned out I had to move the bottom sprocket along the drive shaft and it's ok now.
I connected a empty stubblefield coil former and hooked the motor to a battery, switched on and it worked.

1 single turn of copper wire = 42mm in length
It takes 14 seconds to make 1 RPM.
The SCWM put 206 turns of "bare" copper wire on the supporting bar
Wire size was 0.90mm or 0.025 inches

It took a long time and much concentration to use the machine, it was not a simple matter of holding the wire and hopeing for the best, I found if I lost concentration or was distracted, the copper wire would tend to travel back over the previous turn or a small gap would form between turns.

But the 99.9% of turns were very very tight and very close together.
The DC motor was cool to the touch after doing it's job.

******************************************************
*Did it perform as I expected it to? YES, I can say it is a total success.*
******************************************************

I will post a photo or two of it and also some tiny videos, if they will go through.
Remember,,,,, It is winding a SINGLE copper wire only, as this is a test to see if it would work.

Please enjoy my successfull Stubblefield Winding Machine.

jim

3189 = Beginning of the first ever try to wind a coil on the machine
3190 = Closeup of turns, boy oh boy, these turns are neet and tidy.
3193 = Arrived at the end of the right wooden disk, I had to cut a "small slot" in the top to acomodate the left over wire, so it would not unravel.

Here are more photo's of my Stubblefield Winding Machine.
These are of the motor, gearbox and chain drive, this had me held up for quite a while.

enjoy

jim


3200 = Back end of the 24 volt DC motor (I ran it on a 12v battery)
3201 = Motor is mounted to vertical frame and chain drive and sprockets are seen.
3202 = Closer view of the drive, sorry about the rusty plate, its all I had
3203 = First successful wind is done.

BTW, if anyone wants to make their own Stubblefield Winding Machine using my setup as an example, please do, you are welcome.

General @electricme

You are a good inventor!

Jesus