[ARCHIVED THREAD] - STRONG Magnet question... (Page 1 of 3)
Posted: 12/26/2007 7:55:22 AM EDT
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These are Neodimium magnets (some of the strongest magnets you can buy!) My question is, when they are talking about "pull force" what exactly does that translate into? For instance if a magnet has a 200lb. pull force, does it mean that it can pickup 200 lbs., or that when stuck to metal it seems to weigh 200 lbs. or BOTH? THESE MAGNETS ARE DANGEROUS! DO NOT HANDLE WITHOUT EXTREME CAUTION! This one has a 200lb. pull force (I have this one and one half its size......They got stuck together, And I am convinced without a doubt that no human on this earth could pull them apart, no joke.....they will be stuck together forever!)  This one has an 800lb. pull force!   |
I bet I can pull them apart. 
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NO kidding, I (Quite stupidly) was handling 2 at a time, one in one hand and one in the other at full arms width apart, and needless to say they got within about 2 ft. of eachother and they neerly broke two of my fingers........not because they were smashed by them (because if they were, i'd be missing two fingers) but because of the sheer speed that they flew together. |
What would be your method? Manually, i'd say it's impossible. |
I'd use tools. You said nothing about having to do it manually. 
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I have some smaller ones, you may try sliding them apart... maybe set one in a vise. If they slap back together they may break. |
I've tried the sliding thing with a couple of friends and it was like we were doing nothing at all. 
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 i'll have to try (very carefully) to use some wedges and gradually sepparate them.....i'm sure it's possible.
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| I've got a few small ones that I salvaged from old IBM AT hard drives. They are crazy strong little bastards, and will pinch you HARD if you're not careful. They come in pairs mounted on aluminum plates. It's all you can do to pry one from an I-beam. If you have two of them together, you have to slide them apart. |
| I was working under a ship and we were using mags to hold soft patches in place, w had a 5 foot rule, the couldent get closer than 5 feet or they would fly together, when they did go together a titanium dive knife hammered between them and a guy on each magnet could slide them apart, that was the only way |
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How do you ship something like that 800lb strength magnet? It seems like if it were in a box unless it had very thick padding around it, as soon as the box got close enough to anything metal that the magnet would try and slam through the box and attach to whatever was around. |
In the middle of a large box. The rule we had was that there needed to be three people to unpack stuff like that -- one of the three was behind a partition with a phone. |
Me too, although mine are on steel plates. They are semi circular and one has a hole on each end. I covered the magnet with electrical tape and used the holes to mount it under my headboard. It holds my Glock 17 with a tac light with no problem. I thought about posting a "how to" if I get the time. |
silly questions.. but since ive never had the pleasure of playing with these things.. .. when you say that.. It sounds like you will go flying towards metal objets or metal objects will come flying towards you.. is that really the case? < wants one bad.. > |
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What the crap are they used for? I thought pretty much anything that needed that much magnetic force just used electromagnets. Granted, if I were running a physics lab, I'd try to expense a few just for the fun of it, but still... I'd wanna make sure I took my watch off before I even entered the same room as them, that's for sure. Edit: I'm no physicist, but I imagine when they say "pull force," that's exactly what it is, the force that pulls it towards iron. With Newton's Laws being what they are, that's also the force you'd need to pull it off of flat iron, and just under that is the amount of material it could lift. |
Hopefully they had squashed his nuts between them, preventing him from making any more little not-too-bright salespeople. |
sort of..... You just dont want to become complacent about where and how you handle them, because once they are attracted to something YOU ARE NOT GOING TO STOP THEM from reaching their destination.......if you try WILL get hurt! |
You can get actually get four neodymium magnets from hard drives. Two somewhat large ones (about one square inch and an eighth or quarter of an inch thick) and two tiny ones about a half a centimeter on two sides and two or three millimeters on the third side. I've got three of the larger ones. I used to have four, until I found that if you heat them, they lose their magnetic properties. I guess it scrambles the ordered atoms. |
Well . . . you MIGHT stop them . . . but you're gonna lose a body part. |
I wonder how strong a magnet would be needed and for how long to pull iron out of your blood or at least cause it to increase in concentration at a given point. |
Not getting hurt, but neat. www.youtube.com/watch?v=9EqLreywjTY Crashing. www.youtube.com/watch?v=uET76b7GtXU&feature=related |
| Couple years ago a "real bright kid" came into the ER with one strong ass little magnet on each side of his nasal septum. Not only was the kid bright he was a WUSS. Every time we touch him he whined. The ENT was going to have to cut a little hole in his septum to remove them. They were so slick nothing we had could grip them. SS |
Hmmmm....interesting concept. I wonder if this is the basis behind their "healing properties" |
SPECS! What do you use it for? What is the potential streangth?
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That's a 7 Tesla human MRI magnet. 1 Tesla is 10,000 Gauss and the Earth's magnetic field is about 0.5 gauss give or take. Those little neodymium magnets are probably around 1T in field strength at the surface. As far as shipping magnets, I haven't ordered any of those before, but I imagine they shield them with steel plates before shipping them. For comparison, when we install one of those 7T magnets, we use about 440 tons of steel to shield the room that the magnet is in. |
 Very interesting!Makes sense now looking at your avetar 
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