Gallery, Projects and General > How to's

Electrical Demagnetizer

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Bernd:
First a warning.
WARNING: If you do not understand electricity do not attempt this. If you are afraid of being electrocuted you probably will be, DO NOT ATTEMPT THIS THEN Have an electrician wire this for you.

For a while now I’ve wanted to make a demagnetizer. I got tired of picking up one allen wrench and having one or two others attached to it. I saw a thread on HMEM a while back about a demagnetizing tooling. I though why buy one when you can make one out off some parts around the shop. What I’m using is a transformer or I should say part of a transformer out of a micro wave oven. The first picture shows all the parts need for a test set up.

On the bottom left is what a transformer from a micro wave oven looks like when all together. Notice it has two windings on it. The top winding is of lighter gage wire than the bottom. You need to disassemble the transformer and use the smaller gage wiring. Also you will need a bulb wired in series with the winding. This is in case of a short. The bulb will light brightly if there is a short. This is all temporary wiring and is not going to be used in the final version of this tool.


Here’s a drill that somehow has gotten magnetized.


I’ve plugged in the demagnetizer, you can see the faint glow of the spot light. As you get near the magnet you can feel the drill start to vibrate from the 60Hz frequency. Before you get it all the way through the chips have fallen off.


And there you have it. One demagnetized drill.


Now that I know this setup works it will be permanently mounted in a box with complete wiring and power switch plus a circuit breaker or fuse. All self contained.

Remember electricity can harm you. If you are in doubt stay away from it.

Bernd

websterz:
The day after I drop $40.00 on a demag'er you go and show me how to make one.. :bang:

John Stevenson:
I have heard of people taking the rotor out of a single phase AC motor and passing the parts thru the hole in the middle.

John S.

framey:
cheaper option is to tap it on the side of something else thats how i always do it lol

Bernd:

--- Quote from: websterz on March 20, 2010, 12:44:05 PM ---The day after I drop $40.00 on a demag'er you go and show me how to make one.. :bang:

--- End quote ---

Sorry about that websterz, I could reinburse you the $40. How's a buck a month sound? (hidding under table)

John has also got a good idea, except his would be round.

I've tried banging against something else. All it did was remove the chips. The tool was still magnetized. :coffee:

Bernd

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