A Permanent Magnet That Turns On and Off
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Published 2020-12-01
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*Any experiment you try is at YOUR OWN RISK. The Action Lab assumes no responsibility for any injury if you attempt anything you see in this video or on The Action Lab channel.
All Comments (21)
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Next video : turning off and on gravity.
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The dislikes are from the electromagnets.
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I'm a welder and these things were a game changer, they help with everything from fit up to simply being a mag vise for easy grinding. the company I worked for owned them and I haven't used them since (there's priorities for my money to disappear to) but I've been looking forward to buying a set of them again
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I have seen this "switchable" magnet system on a portable drill press which uses magnets to attach itself to whatever steel item you are drilling, in my case, a large "I"beam. I was intrigued by the way it could be switched on or off just by turning a dial on the side, and now I know how it is done thanks to you!😉👍
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my magnet doesnt work :( "have you tried turning it off and on again?"
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To me, the most amazing thing in this video is the revelation that there is magnetic "paper" that lets you see magnetic fields.
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I've seen these used a lot in machining for things like holding dial indicators and have always wondered how they worked. Thanks for the info.
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Beautiful simplicity on that switch design -- thanks for breaking it down so cleverly.
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Did not expect turning off magnets would require more magnets.
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The one time that "reverse the polarity" is the correct answer.
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When welding frames, you can use a magnetic square that has a mechanical switch on it, once the magnet is "on", the square is able to stick to metal pretty easily, when flipping the switch "off", it interacts with some mechanical components that move the magnets inside the square away from the inner walls of the square, moving them as closely inwards as it can
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I am a 61 year old DIY dabbler and inventor and I am addicted to your show. I usually know what the outcomes of your experiments are going to be but sometimes I don't and I enjoy your presentations either way.
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You can also suppress a permanent magnet using Lenz’s law, by coiling a wire around it in much the same way you would make an electromagnet but in reverse. Once you apply a current to the coil when arranged correctly it will suppress the permanent magnet with an equal and opposite electromagnetic polar force. We use this principle in railway engineering. You should give it a try :)
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The Action Lab: Now let's test this theory out with my trusty metal sheet The Metal Sheet: *KILL ME*
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Incredible teacher! Been following for a while… Scribes, and I say… It's awesome how are you taught us first, how magnetic flux will shortcut through the steel plate… THEN ! You showed us how it's short-circuiting through their manufactured magnet block … Awesome technique , I understood it right away! Thank you so much , awesome content always
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I use these quite a lot at work, they are very useful to position holders that hold sensors around a test article. Put it in place on (or below!) the steel base plate, turn the knob and it goes nowhere. Make sure the magnetism doesn't affect your test though. I had some idea how it worked, but now I know. Nice video!
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I'm just wandering how he's gonna separate that chunk of steel from that monster magnet.
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I appreciate how excited he is about all his experiments. Wish I had more teachers like him.
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I use these magnets at work to move huge metal parts, always wondered how they work awesome video!
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When I first got into machining that was one thing that blew my mind was the indicator bases. It was an on off switched magnet and it was incredible to me
