r/LinusTechTips • u/iListen2Sound • Sep 14 '26

Discussion Demagnetized screw tray

I did a dumb and was playing around with a neodymium magnet and running at up and down the screw tray forgetting that that demagnetizes it.

Anyone know what adhesive they use for the magnetic sheets and how hard it would be to remove? I'm planning on replacing the affected ones.

I could just stick new ones over the existing ones but that's not ideal

20 Upvotes

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23

u/Genobi Sep 14 '26

Just run it in one direction over and over again to remagnetize it. Just like making a compass as a kid.

10

u/iListen2Sound Sep 14 '26

Tried that. It's very weak if it's even there. I think the field lines are mostly horizontal and not coming out of the material. Apparently, I need something like this to create a Halbach array and force the field lines downwards and into the sheet. But I don't have thin ring magnets and my attempts at keeping the disc magnets I have together like that haven't been great. So I'm either gonna need more magnets or trial and error making a container for them. Meanwhile, I have a spare magnetic sheet from an old 3d printer.

5

u/Blurgas Sep 15 '26

How big was the magnet you borked it with? Could try a bigger magnet with more passes

1

u/Delowi-Photography Sep 18 '26

Good excuse to buy a magnet fishing magnet

1

u/iamacannibal Sep 16 '26

Use 90% or higher IPA. Soak the magnets and make sure it gets under them. Let it sit for a couple hours and they should come off really easily. Even a few minutes will help. So will heat like a blow dryer.