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#1
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Questions about magnets.
Hey all, I'm working on a little project and I was wondering if anyone in the CD community had any answers to the following questions.
Does every magnet have a north and south pole? I would assume so. If you break a magnet, do those individual pieces now have a N&S pole each? What is the strongest pole? What is the most effective way to shield from magnetic fields? Where can I buy magnets besides at the hardware store? The stronger the better (but still relatively cheap, and also lightweight). |
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#2
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Re: Questions about magnets.
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Yea, all magnets are N & S. Yes, breaking magnet means N & S pole |
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#3
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Re: Questions about magnets.
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Last edited by Al Skierkiewicz : 31-05-2005 at 21:33. |
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#4
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Re: Questions about magnets.
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Last edited by RbtGal1351 : 31-05-2005 at 21:40. Reason: unclear |
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#5
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Re: Questions about magnets.
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If you can find an old microwave, then you could find some very strong ring magnets in the "MAGNETRON" (that is really what they are called). I measured one and was getting about -+800 gauss |
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#6
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Re: Questions about magnets.
You can get really strong magnets out of hard drives. I would recommend using old broken ones as working hard drives are expensive.
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#7
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Re: Questions about magnets.
Try here for strong magnets: http://search-desc.ebay.com/Neodymiu...Z2QQsacatZ1266
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#8
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Re: Questions about magnets.
You can make an electromagnet with some sort of magnetically attractable metal core and a coil of wire plus an electric current to boot. They're usually weaker though. For some really strong magnets, look in any bad trashed audio speaker (not internal to a TV set).
Oh yeah, they do have N&S poles as others have mentioned, when split in two they indeed make two separate magnets. There is no such thing as the strongest pole and the best shielding is space or some seriously magnetic resistant material. I could not name one for you though. -Joe |
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#9
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Re: Questions about magnets.
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#10
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Re: Questions about magnets.
*rubs hands together* Boy are you in for it....
http://www.amazingmagnets.com http://www.engconcepts.net/ http://www.wondermagnet.com The last one also has ferro-fluid. Also, in response to to one pole of a magnet being "stronger" than another... If a magnet is symmetrical on a plane perpendicular to the poles, then they're the same strength. You can increase the surface gauss at one end by tapering it to a point, however. It doesn't matter if this end is a N or S pole, however. For lots of info on magnets and stuff, see: http://www.dansdata.com/magnets.htm http://www.dansdata.com/magnets2.htm |
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#11
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Re: Questions about magnets.
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#12
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Re: Questions about magnets.
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is used to shield magnetic fields. |
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#13
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Re: Questions about magnets.
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Do you have a source for mumetal, we are almost out of the sheet stock and I need to replenish but have only been half hearted about looking. Ferro fluid is not a magnet it is ferrous metal particles suspended in a viscous liquid. It is most commonly used for speaker voice coil cooling. A few drops squirted into the gap between the voice coil and the magnet structure will do a great job of transferring heat to the magnet body and basket assy without changing the damping of the speaker. |
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#14
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Re: Questions about magnets.
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Lord Corporation (http://www.lord.com/Default.aspx?tabid=718) has been developing magnetorheological fluid applications for several years. The site has lots of interesting information and applications. There must be a way to make a continuously variable transmission for a FIRST robot using this stuff, but I haven't come up with one yet. |
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#15
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Re: Questions about magnets.
NeoWorld Magnets is a good site for lots of different kinds of really strong magnets and magnetic jewelry.
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