Stubblefield coils (bifilar) and speculations

[Cap-Z-ro]

The hole in a record can be safely expanded by heating the shaft that you are going to use...you may have to use smaller diameter ones, increasing the width until you reach the correct size hole.

The excess 'flash' can then easily be trimmed off afterward.

Hope that helps.

Regards...

[protonmom]

Thanks Cap Z ro and Jeanna.  Cap, I did enlarge the last record's spindle hole with heat from an old soldering iron, which was probably way too hot.  I like your idea better of gradually enlarging it with heated rod.  Today I bought some 1/2 in all thread and some iron rod to slip over it....with washers and nuts.  It looks like it will all work fine.  I did check everything with a magnet at the store.  I also found some wiring that I have never seen before.  I am so used to buying Romex with the three wires in it.  This wiring is round and has four wires in it, same size as the romex.  It is NM 9 bed and bath???  It was .79 per foot instead of the .59 ft for romex.  So for a few cents more I get four wires and the round covering is easier to strip than romex.  (thinner outter covering)  One of the three inside is the ground, so that one is already bare, and the other three I can easily strip with a paring knife as I did before.  I might use an old 78 record for the base this time instead of an LP because the material is thicker.  Of course, though, that might also make it harder to enlarge the hole.  We shall see.  Everyone at the store knows I am making SOMETHING but I dont tell them what it is.  Keeps them wondering.  Oh yeah....I also was able to get a huge bagful of spent one time cameras again.  Yippee!  Christmas!  I could not believe my luck!  In one store I had just missed them before they got recycled.  I almost did not go to the next store to ask.  Sure am glad I did.  With any luck, one of these days maybe I will be able to light an LED and for me that is what it is all about...Just to be able to do it.  I know I might never achieve much, and I might be spending a lot of money for nothing...but I am sure having fun learning.  I almost even understand all of you now when you talk about the different components you are working with.  I might never be as smart as all of you, but I am gaining knowledge bit by bit as I read each forum and watch all of you do such great things!  And for that, I thank each and every one of you.

[Cap-Z-ro]

You might want to try the tapered point of a hot glue gun..if done alternately on both sides it should get you to the point where the rod you will be using can be heated for the final expansion.

Regards...

[IotaYodi]

The NM stands for non-metallic sheathing. Romex itself is a brand name and slightly more expensive than the other brand names. It is the most prevalent though.

This wiring is round and has four wires in it, same size as the romex

This is called 3 wire by electricians. If it has 3 wires its called 2 wire. The reason its called that is because the ground wire is not included as its not a "hot" wire. The white or neutral and the colored wires are "hot" wires. The "4" wire you mentioned has 2 colored wires and a white wire plus the ground. You can use this for 2 separate 120 volt circuits single phase,or one 240v circuit single phase. If the white or neutral wire is not needed for the 240v device then its just left off. An example would be a 240 volt stove. It needs the neutral because of lights and timers and taps into one hot wire making it 120v. 
If your going to do a lot of records,and even if your not, A great tool for making holes in metal or plastic is a Unibit. They come in different sizes. The larger the more expensive. They are stepped so you can tell when to stop drilling.
http://www.mytoolstore.com/klein/59001.html

[jeanna]

Hi everybody,
I just posted the measurements taken from the basic Cu+Zn- probes over in the datalogging page.
I am not going to continue to post NS coils info over there since the point of that thread is to be a clean datalogging thread. 

So, I will post the scope shots I dearly wanted to post last year in this thread.

There is only 1 NS coil in this measurement, and it is on the south side of the long line.
The line is 50 feet from Carbon rod to Zinc nail (the meter is half way at 25 feet)... then 5 more feet away from the zinc nail is the NS coil.

For these measurements,
The 10's which were sticking out I twirled into a spiral antenna. - why not?
I twisted the other 2 wires together..call them the 5,6 = twisted. and attached them to a 5 foot long wire which was then connected to the zinc nail. It is 5 feet long but the NS coil is right there next to the zinc nail

Here are some pix.

This coil makes a big difference.
The plain Cu+Zn- probes had a 10mV difference and this baby has a 60mV difference!!!!!

jeanna