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de-magnetize digital calipers

I printed it out and glued in some basic PA 18mm x 4mm magnets. Voila - it works. I demagnetized the below screw driver with it in an instant. The screwdriver could pick up the little 3mm ID bearing before as shown on the shaft and after demag it appeared to be completely non-magnetic.


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Amazing. I've seen them discussed but didn't think they would work well. How long of spinning before it was de-magged? Now if you went with an even longer stack of magnets in the same array (a thicker hockey puck) would it increase effectiveness or work better on a magnetized object of higher mass? If you spin it by your temple, can you erase thoughts? LOL
 
I just spun it for a few seconds and gradually pulled it away while letting it spin. I don't think you need fancy magnets or lots of them. I should test it further. It was pretty much instantaneous just with the 4 basic magnets and very effective. I suspect for demagnetizing screw drivers and calipers it is all one would need. If you aligned all the magnets in the same pole direction would it then magnetize things rapidly?

I didn't try erasing my thoughts - but if you want a go Peter I can make you one.
 
I made one similar to Janger out of an aluminum blank and it surprisingly work very well. I have demagnetize lots of allen keys and drill bits with great success. I have four small magnets and the poles are alternated on mine.
 
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