MightyTank[501st] Posted August 16, 2010 Report Share Posted August 16, 2010 I've checked all the threads and comments on rare earth magnets, and all the links to the individual magnets ppl used are dead >_<. So i was wondering if someone could tell me if they remember the pull force on the magnets they used, or what force i should keep above / below. Thanks! Quote Link to comment Share on other sites More sharing options...
pandatrooper[TK] Posted August 16, 2010 Report Share Posted August 16, 2010 Not sure if this is what you're looking for, but I use 3/4" x 1/8" thick rare earth magnets, 2 stacked together (2 on top, 2 on the bottom). Each one pulls 22 lbs. I know some other troopers use big square ones but I couldn't find them locally so I used these: http://www.leevalley.com/en/wood/page.aspx?p=32065&cat=1,42363,42348 Quote Link to comment Share on other sites More sharing options...
MightyTank[501st] Posted August 16, 2010 Author Report Share Posted August 16, 2010 (edited) On 8/16/2010 at 12:12 PM, pandatrooper said: Not sure if this is what you're looking for, but I use 3/4" x 1/8" thick rare earth magnets, 2 stacked together (2 on top, 2 on the bottom). Each one pulls 22 lbs. I know some other troopers use big square ones but I couldn't find them locally so I used these: http://www.leevalley.com/en/wood/page.aspx?p=32065&cat=1,42363,42348 Edited December 4, 2020 by gmrhodes13 link not working, removed gmrhodes13 2020 Quote Link to comment Share on other sites More sharing options...
snoberg Posted August 16, 2010 Report Share Posted August 16, 2010 You will be surprised at how much they pull, especially when connected together. I have had trouble getting mine apart sometimes and they are about the same size as yours. Quote Link to comment Share on other sites More sharing options...
TK_LEPER Posted August 16, 2010 Report Share Posted August 16, 2010 I've pinched skin off my fingers a few times, that's how much pull they have. Be cautious. Quote Link to comment Share on other sites More sharing options...
MightyTank[501st] Posted August 18, 2010 Author Report Share Posted August 18, 2010 I've pinched skin off my fingers a few times, that's how much pull they have. Be cautious. Lol will do. Just got them in, and these buggers are nuts. Now just waiting on my AM kit to get here. should be tomorrow! Quote Link to comment Share on other sites More sharing options...
Jorran Posted August 25, 2010 Report Share Posted August 25, 2010 (edited) Are there any hardware or craft stores in the US that sell them? I've been checking all of the usual suspects online but can't seem to find anything. *EDIT* Never mind! I found a thread that said that local stores don't carry the good ones and to just order them online. Edited August 25, 2010 by Jorran Quote Link to comment Share on other sites More sharing options...
felgercarb Posted October 11, 2010 Report Share Posted October 11, 2010 I've pinched skin off my fingers a few times, that's how much pull they have. Be cautious. LOL....me too, they are lethal sometimes Quote Link to comment Share on other sites More sharing options...
JimCem99[501st] Posted November 9, 2010 Report Share Posted November 9, 2010 LOL....me too, they are lethal sometimes LOL, yeah me too. I had issues with them last night (just got them in) where a couple shattered from flying into one another. It was crazy Quote Link to comment Share on other sites More sharing options...
stukatrooper Posted November 10, 2010 Report Share Posted November 10, 2010 If you are going to use the mags for clamping then all they need to do is hold the two parts you are gluing.Not pull the moon out of its orbit with them. One top tip is keep your work area clear of any rivets knives pliers screws etc as they will all end up attatching themselves to you armour part. Quote Link to comment Share on other sites More sharing options...
MightyTank[501st] Posted November 10, 2010 Author Report Share Posted November 10, 2010 lol, and keys, cell phone, belt buckle, the screws in my foot. I love those things. Quote Link to comment Share on other sites More sharing options...
JoeR Posted November 10, 2010 Report Share Posted November 10, 2010 What size and shape where is a good place to buy them in the UK? There are hundreds of shapes and sizes... Sorry to hijack the thread... Quote Link to comment Share on other sites More sharing options...
stormtrooperguy[501st] Posted November 10, 2010 Report Share Posted November 10, 2010 The magnets I use for clamping are 7.74 pounds each. 1/2" diameter discs, 1/8" thick. Unfortunately, I have a steel workbench. You can see how this gets challenging Quote Link to comment Share on other sites More sharing options...
Red trooper Posted November 11, 2010 Report Share Posted November 11, 2010 Quick tip, if you have any old hard drives lying around, they have stupidly strong magnets inside, plus once they are apart you can make really sure any sensitive data can not be retrieved from the platters. Quote Link to comment Share on other sites More sharing options...
stormtrooperguy[501st] Posted November 12, 2010 Report Share Posted November 12, 2010 I've got an affiliate program with K&J Magnetics now... if anyone buys magnets through this URL I get a cut, and you don't pay any more than you ordinarily would. So, feel free to help out Quote Link to comment Share on other sites More sharing options...
Plastic Fury[TK] Posted November 12, 2010 Report Share Posted November 12, 2010 Since somebody asked, I have actually had luck finding them at my local Michael's craft stores. Two different locations near me, carry the silver rare earth type. They only have two sizes but it was cool to see them, I stocked up on some. I may go online to order up some of the larger ones for the future. Quote Link to comment Share on other sites More sharing options...
MartinSivertsen[501st] Posted June 9, 2011 Report Share Posted June 9, 2011 Looks like they have a rating as to how strong they are: N35, N38, N40, N42, N48 etc. After some further googling, I found some more information at http://www.kjmagnetics.com/neomaginfo.asp N35, N38, N42, N38SH...what does it all mean? Neodymium magnets are all graded by the material they are made of. As a very general rule, the higher the grade (the number following the 'N'), the stronger the magnet. The highest grade of neodymium magnet currently available is N52. Further information: Neodymium Magnet Physical Properties So the tip is to look at the N*-rating, and it looks like N40 is more than sufficient, anyway that's the rating of the 10x5mm magnets stukatrooper linked to, and his builds seem to work out allright Quote Link to comment Share on other sites More sharing options...
bobojuice Posted June 9, 2011 Report Share Posted June 9, 2011 Quick tip, if you have any old hard drives lying around, they have stupidly strong magnets inside, plus once they are apart you can make really sure any sensitive data can not be retrieved from the platters. I'm using this method. I've already pulled apart about thirty or so hard drives. Also, remember the older the hard drive the better the magnet. Some of the old compaq hard drives have magnets strong enough to crush fingers. Oh, and make sure to wear gloves when handling these things. Strong magnets are not toys. Quote Link to comment Share on other sites More sharing options...
Locitus[Admin] Posted June 9, 2011 Report Share Posted June 9, 2011 Yeah I got most of my magnets out off old SCSI server grade hard drives. Must have been around 10 000 USD worth of hard drives back in the day. It's good to work in IT. Quote Link to comment Share on other sites More sharing options...
john danter Posted June 9, 2011 Report Share Posted June 9, 2011 Whatever the KG rating, it's a 4th for vertical cross plane stuff So 40kg force hanging from a ceiling would only hold 10kg hanging side on from a wall Quote Link to comment Share on other sites More sharing options...
sith_241 Posted June 9, 2011 Report Share Posted June 9, 2011 Yeah I got most of my magnets out off old SCSI server grade hard drives. Must have been around 10 000 USD worth of hard drives back in the day. It's good to work in IT. I got some weird Neodynium mix alloy magnets at work that are extra strong the other day (the will stick with one on my stomach and one of them on my back) that are used to focus electron beams in our linear accelerators. Everything was great until it jumped across the room and exploded against my tool box. Yeah, you only need like 3-4 lbs force for gluing. Quote Link to comment Share on other sites More sharing options...
Locitus[Admin] Posted June 10, 2011 Report Share Posted June 10, 2011 I got some weird Neodynium mix alloy magnets at work that are extra strong the other day (the will stick with one on my stomach and one of them on my back) that are used to focus electron beams in our linear accelerators. Everything was great until it jumped across the room and exploded against my tool box. OMG!! Now that is strong! Quote Link to comment Share on other sites More sharing options...
Dimo[TK] Posted June 10, 2011 Report Share Posted June 10, 2011 http://unitednuclear.com/index.php?main_page=product_info&cPath=70_71&products_id=289&zenid=d3b98a879ba24c6622e33e23531cce5f This one might be a bit on the big side, but great website for your magnet and fissionable material needs. Quote Link to comment Share on other sites More sharing options...
bobojuice Posted June 10, 2011 Report Share Posted June 10, 2011 Yeah I've heard stories about two of those super magnets being put in the same room and having them fly across the room and injure people. I wouldn't want to be near any of those magnets ever. Quote Link to comment Share on other sites More sharing options...
sith_241 Posted June 10, 2011 Report Share Posted June 10, 2011 Yeah I've heard stories about two of those super magnets being put in the same room and having them fly across the room and injure people. I wouldn't want to be near any of those magnets ever. Yeah, we had a big one similar to those get stuck to the ceiling once when it sheared the bolts on its 5 ton cart. Someone used like brass 1/4-20 bolts to hold it down. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.