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magnet recharging

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F-30

04-04-2006 20:19:15

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I'm looking for a copy of directions to recharge a horseshoe magent using a wire and battery. I've done this several times but have lost my paper. Any help??

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James Herrman

04-06-2006 21:08:30

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

Nice interesting posts. Be sure to keep the "keeper" on when the magnet is being transfered and always keep one on if you just use the magnet to pick things up. They will lose their magnetism without a keeper to complete the circuit. Not sure why cast would be better, but may be. I use a piece of low carbon 1020 mild steel. Also understand that storing several magnetos like the F4's side by side can demagnetize them. I built a recharger from Gingerly's plan and it sure does the job for me. Took a long time to build it, but the work was worth the effort. JIM in ILL.

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Ed Topel- Instructions

04-05-2006 21:00:06

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

Use #14 soild core wire
Make about 30 turns on each leg
Observe winding direction
Place keeper bar across ends of magnet (keeper should be cast iron but steel should work)
Touch wire ends to 6 volt battery for 1 to 2 seconds
Slide keeper off both ends of the magnet at the same time Double check polarity- trademark side should attract the needle of a compass (north

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Dave NE IA

04-05-2006 09:14:45

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

I don't want to be a worry wort and all, but it best be done on a starter cable away from the battery. I have done it hundreds of times, but I have recently seen what happens if a battery gets the spark at the right time. Never arc on the threads of a starter, only the outside of the nut, as it may burn into the threads. Dave NE IA

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woodache

04-05-2006 07:35:06

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Re:Powerful magnet recharging demag tips in reply to F-30, 04-04-2006 20:19:15

Say you need a magnetic screw driver in the field just wrap the screw driver with insulated wire flash the ends across the battery.
You may need somthing more powerful for the shop, use a old AC motor. Take the ends off the motor remove the rotor take the leads ends flash on battery while haveing the part inside of the old motor.
Now you may need to demag something, intstall a push botton switch in the same old motor, wire in a 110V AC plug put your part to be demaged inside the field, hold the botton/switch a few seconds its done!

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Mark

04-05-2006 07:09:59

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

what does the fine print say? How long does the typical magnet hold it's 'charge'? This might be considered high school science..but it sure is interesting to me!

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Bob M

04-05-2006 10:12:16

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Re: magnet recharging in reply to Mark , 04-05-2006 07:09:59

I gotta wait for Ed to rescan that image before I can read that fine print too!

However to your other question, a magnet like that will hold it's magnetism indefinitely or until:
- it is struck hard or dropped on a hard surface
- is brought near a strong external magnetic field - eg. welding, nearby lightning strike.
- gets heated above certain temperature (I forget how much exactly but it's in the several hundreds of degrees)

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Grabatire

04-05-2006 02:59:26

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

What keeps the wire from simply burning up when it is connected to the battery? Is there a resister or transformer of some sort to cut the power down?

I have several magnets that need a kick, hence my curiosity.

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Ed Topel

04-05-2006 21:08:22

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Re: magnet recharging in reply to Grabatire, 04-05-2006 02:59:26

Now that I have posted the instructions, you will see that you only hold the wire on the battery a second or 2 or it will get hot. It may even get a little warm in a couple of seconds but thats all it takes. Ed

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John M

04-05-2006 03:28:58

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Re: magnet recharging in reply to Grabatire, 04-05-2006 02:59:26

Because the yonly need to be touching the battery posts for a couple of seconds.

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Ed Topel

04-04-2006 21:26:28

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

Heres the sketch with instructions. I also posted it in the community album since images on the board don't get archived.Ed

Magnet recharging sketch

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Ed Topel

04-04-2006 21:33:09

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Re: magnet recharging in reply to Ed Topel, 04-04-2006 21:26:28

I'll try rescanning it tomorrow to make it large enough to read. Sorry about that. Ed

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Farmer Bob

04-04-2006 21:18:18

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Re: magnet recharging in reply to F-30, 04-04-2006 20:19:15

Here ya go!

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