I find myself more and more in need of a magnetizer and, more importantly, a demagnetizer...
After giving up on the demagnetizing magick of the silly boxes (which magnetize quite well, actually), I think I need something more serious.
Can this demagnetizer really work?
As long as it actually has components inside it, it should be fine.
I'd always wondered about those first things for demagnetising.
An alternative is to heat the object above its Curie point - for steel that's about 770 Centigrade so not a real convenient alternative.
I read somewhere that hitting the magnetized object real hard (e.g. a powerful knock with a hammer) can also demagnetize (or was it to magnetize?).
I tried, but it never worked.
I find my really high quality steel tools (screwdrivers) magnetise well naturally. They get knocked around..
Its all about creating random directions throughout the material, thereby resulting in no net direction of magnetism. I GUESS that the powered ones are AC powered coils, rotating the magnetic fields in opposite direction, hopefully not creating a particular direction??! thats my guess..
Fixed ones are only good at demagnetising the magnetic field of the opposite direction. So its technically difficult to de-magnetise.
The only things ive demagnetised are Neo magnets, by heating them above 80 deg C. :((((
I've had one of those Magnetizer / Demagnetizer for years and it works great as a magnetizer but not so much as a demagnetizer. Maybe the newer ones work better.
Which one are you referring to - the passive with two holes or the active AC one?
It's this one from sears.
Here's the same from Amazon.com
I ordered the active one from FocalPrice, when it arrives I'll write here if it works.
And it works!
Not only can it demagnetize screwdrivers pretty quickly (magnetized with one of the silly magnetizer/demagnetizer boxes) but it can also magnetize them slightly.
To magentize - place the screwdriver on the "operation field" (Chinese for the device part the covers the magnet) and press the button for a few seconds. Leave the button and only then remove the screwdriver.
To demagnetize - place the screwdriver on the "operation field" and press the button for a few seconds. While the button is pressed pull the screwdriver slowly away from the "operation field" and only when at least 10cm from the device leave the button.
Works great, I really love it :)
http://www.focalprice.com/detail_HT431L.html and they sent me one with the correct plug (European).
And this is hilarious: I opened it up to see what's going on in there... simplicity FTW!! :D
AC electromagnet! lololo!L!!! I like it!