I'm experimenting with remagnetizing a horseshoe shaped magnet for a A.K horn speaker(M) Model but what I'm doing is using two really strong magnets out of a old microwave oven and placing the speaker magnet on these to soak up the magnetism off these magnets it seems to be getting stronger after 1 day so I'm wondering if I leave it longer will it keep getting stronger and would it get strong enough to have the tenacious pull to work?,Its kind of like magnetizing screwdrivers by doing this, I have read the article on this site about building a remagnetizer but was curious about this method.Thanks, Mike L.

Mike

Not sure time does that much? Magnetizing happens as soon as your strong magnet make contact and breaks with the other metal.

Find an old computer hard drive and remove the magnet. Be careful, don't let your finger get between the magnet and iron. You will smash a finger.. I think you will have better results using this magnet.

Norm

:I'm experimenting with remagnetizing a horseshoe shaped magnet for a A.K horn speaker(M) Model but what I'm doing is using two really strong magnets out of a old microwave oven and placing the speaker magnet on these to soak up the magnetism off these magnets it seems to be getting stronger after 1 day so I'm wondering if I leave it longer will it keep getting stronger and would it get strong enough to have the tenacious pull to work?,Its kind of like magnetizing screwdrivers by doing this, I have read the article on this site about building a remagnetizer but was curious about this method.Thanks, Mike L.

Mike L.,

Many years ago I had to service magneto telephones we had in a private service between various units miles apart. Sometimes after a bad lightning storm the magnetos in some telephones would not generate ring voltage and I found the horseshoe magnets had been demagnatized. I developed a system using an auto battery, a heavy duty relay and a pushbutton and a coil made of #12 insulated wire. I made a coil of several turns of wire that would slip on the leg of the magnet, painted the end of one leg of each magnet and slipped the coil on each magnet the same way, used a piece of iron bar as a keeper across the ends of the magnet and pressed the pushbutton to energize the relay applying battery voltage to the coil for about a couple of seconds. This would remagnatize the magnets and the magneto would generate ring voltage again.

Radiodoc
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:I'm experimenting with remagnetizing a horseshoe shaped magnet for a A.K horn speaker(M) Model but what I'm doing is using two really strong magnets out of a old microwave oven and placing the speaker magnet on these to soak up the magnetism off these magnets it seems to be getting stronger after 1 day so I'm wondering if I leave it longer will it keep getting stronger and would it get strong enough to have the tenacious pull to work?,Its kind of like magnetizing screwdrivers by doing this, I have read the article on this site about building a remagnetizer but was curious about this method.Thanks, Mike L.

The repair station (aircraft motors and generators overhaul and repair) where I use to work, had an instunment set up with several high voltage cap, a DC power supply and contactors. The depleted magnets would be installed in a fixture that wrap wire around the magnet (watching the polarity of the wire and magenet), the caps were charged up to 100 - 200 volts from the power supply, the power supply disconnected and the contactor closed to connect trhe coil of wire and magenets to the capacitors. Somethimes you would hear a loud thump, and the wire would jump. The magnets were then removed from the fixture and checked to see if the magnetic field increased with a meter for testing magnetic fields. In most cases, the magnets would pass the check and could be reinstalled, other times the magnets would have to go back into the fixture for another thumping from the capacitors. And yes you made sure to remove any spring drive watches from your arm & body and that there were no metal tools around.

David s
:Mike L.,
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:Many years ago I had to service magneto telephones we had in a private service between various units miles apart. Sometimes after a bad lightning storm the magnetos in some telephones would not generate ring voltage and I found the horseshoe magnets had been demagnatized. I developed a system using an auto battery, a heavy duty relay and a pushbutton and a coil made of #12 insulated wire. I made a coil of several turns of wire that would slip on the leg of the magnet, painted the end of one leg of each magnet and slipped the coil on each magnet the same way, used a piece of iron bar as a keeper across the ends of the magnet and pressed the pushbutton to energize the relay applying battery voltage to the coil for about a couple of seconds. This would remagnatize the magnets and the magneto would generate ring voltage again.
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:Radiodoc
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::I'm experimenting with remagnetizing a horseshoe shaped magnet for a A.K horn speaker(M) Model but what I'm doing is using two really strong magnets out of a old microwave oven and placing the speaker magnet on these to soak up the magnetism off these magnets it seems to be getting stronger after 1 day so I'm wondering if I leave it longer will it keep getting stronger and would it get strong enough to have the tenacious pull to work?,Its kind of like magnetizing screwdrivers by doing this, I have read the article on this site about building a remagnetizer but was curious about this method.Thanks, Mike L.

:I'm experimenting with remagnetizing a horseshoe shaped magnet for a A.K horn speaker(M) Model but what I'm doing is using two really strong magnets out of a old microwave oven and placing the speaker magnet on these to soak up the magnetism off these magnets it seems to be getting stronger after 1 day so I'm wondering if I leave it longer will it keep getting stronger and would it get strong enough to have the tenacious pull to work?,Its kind of like magnetizing screwdrivers by doing this, I have read the article on this site about building a remagnetizer but was curious about this method.Thanks, Mike L.
Mike: I saw your "magnetic saga" in passing and thought I would inject a thought. Some years back I taught a course in magnetics in the engineering dapratment at my university. I used several demonstrations and experiments in the course, one of which involved observing the magnetic domains within a steel sample under an electron microscope. You can observe these domains move even at room temperature. We lowered the temperature of the sample using liquid nitrogen and the domains would almost come to a standstill. While the same was cooled we could apply an external magnetic field and magnetize (remagnetize) the sample very efficiently. I have personally used this principle in my shop by cooling old magnets in my freezer to about -20 F and applying a magnetic field using several turns of #6 wire and a 12 volt automobile battery. I have had good success with this. If magnetic polarity is important you should observe direction of both the coil and applied current. You might want to refer to left and right hand rules in your old elementary physics book. Good luck.

I 've been reading the following posts and find the information very helpful and interesting and the hard drive magnets are alot more stronger than the microwaves magnets and it surprised me that such thin magnets can be so magnetic,Does the horseshoe magnet for the atwater kent horn speaker have a north &south for each leg(at the open end) of the magnet or is the arch one and ends one(north or south)?Thanks Mike L.

:Does the horseshoe magnet for the atwater kent horn speaker have a north &south for each leg(at the open end) of the magnet or is the arch one and ends one(north or south)?Thanks Mike L.

We call them "horseshoe" magnets (which have the ends almost touching) but in fact they are U shape magnets. Here's a page with pictures of horseshoe magnets (like I had as a kid) and U shape. Not that it really matters.

http://www.indigo.com/magnets/horseshoe-ushape-magnets.html

You can buy tons of magnets here: http://www.magnetsource.com/Consumer%20Pages/Horseshoe_Mags.html

Their magnets look more like C shapes than U shape...Maybe I'm too fussy...;)

To answer your question, yes, both ends are N and S. Take it as a bar magnet that was bent, simply.