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For magnet lovers...
ever since I was a child, magnets have held a fascination for me. I've been
collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! |
On a sunny day (Tue, 22 Jun 2004 08:21:58 GMT) it happened "Greysky"
wrote in : ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! There is a big magnetic iron core if you dig deep enough. There are stars with an extremly strong magnetic field, very very strong. We need a composite (non metal) spaceship. hehe |
On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky"
wrote: ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge Take apart a hard drive. There is a pail of magnets in the head positioning servo. They are very powerful and will pinch your fingers if yo are not careful. Regards, Boris Mohar Got Knock? - see: Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/ |
On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky"
wrote: ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Steve J. Noll | Ventura California | | The Used High-Tech Equipment Dealer Directory | http://www.big-list.com | The Peltier Device Information Site: | http://www.peltier-info.com |
Greysky wrote:
ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! For purchase: http://www.gaussboys.com has a small assortment. As you are probably aware, the older the drive, typically the bigger the magnets. The largest that I've found were from an old full-height 5 1/4" internal 300 MB SCSI drive. Newer drives are a bit disappointing, their magnets are getting pretty thin and break easily... |
"Steve J. Noll" wrote in message ... On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky" wrote: ever since I was a child, magnets have held a fascination for me. ... They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Now how come I never thought of that one. Know what i'll be doing this evening... -- Steve N, K,9;d, c. i My email has no u's. |
http://www.wondermagnet.com/
"Greysky" wrote in message om... ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! |
On Tue, 22 Jun 2004 13:06:08 GMT (Steve J.
Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? |
"Steve Nosko" wrote in message ... "Steve J. Noll" wrote in message ... On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky" wrote: ever since I was a child, magnets have held a fascination for me. ... They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Now how come I never thought of that one. Know what i'll be doing this evening... -- Steve N, K,9;d, c. i My email has no u's. I just tried it with a 1/2 inch copper pipe and a 1/4 inch cube magnet. Incredible! I did not know it would have that much of an effect! |
Boris Mohar wrote in message . ..
.... Take apart a hard drive. There is a pail of magnets ... ^^^^ What a great mental image! I was in need of a chuckle today, and you came through. Thanks. (BTW, the OP had already mentioned the HD magnets...) |
"JW" wrote in message ... On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? I'm guessing some EMF is induced. "PM" |
Steve Nosko wrote:
"Steve J. Noll" wrote in message ... On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky" wrote: ever since I was a child, magnets have held a fascination for me. ... They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Now how come I never thought of that one. Know what i'll be doing this evening... Hey fun! I knew about the effect, but never thought to try it with something so mechanically simple. I'm going to have to show the kids now. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com |
JW wrote:
On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? http://my.execpc.com/~rhoadley/magpipes.htm |
"Steve Nosko" wrote in message ... "Steve J. Noll" wrote in message ... On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky" wrote: ever since I was a child, magnets have held a fascination for me. ... They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Now how come I never thought of that one. Know what i'll be doing this evening... Chuckle chuckle...anyone have a silver pipe? Steve N, K,9;d, c. i My email has no u's. |
"Paul_Morphy" wrote in message ... "JW" wrote in message ... On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? I'm guessing some EMF is induced. ....and... continue with the line of reasoning... What does that EMF produce and where?... -- Steve N, K,9;d, c. i My email has no u's. |
what does it do??
They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? Now how come I never thought of that one. Know what i'll be doing this evening... Hey fun! I knew about the effect, but never thought to try it with something so mechanically simple. I'm going to have to show the kids now. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com |
Hi, I don't know how powerful the magnets you have but I picked up these
3/4 inch sphere magnets on ebay. I have never seen any magnet so powerful. Amazing!!!! These are not toys for kids!!!!! One of his auctions. http://cgi.ebay.com/ws/eBayISAPI.dll...m=55031753 63 http://www.kjmagnetics.com/ Have fun ================================================== Greysky wrote: ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! |
In article , Steve wrote:
--------------9002068B3CF78CE28C8CE7B3 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit what does it do?? They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? The magnet moving down the pipe induces eddy currents. These eddy currents produce an electromagnetic force that resists the movement of the magnet (with respect to the pipe) and does so to an extent varying directly with the speed at which the magnet is moving. This slows down the magnet. At least this is what I have heard. And aluminum tubes do this also, just not quite as much as copper ones do. And I have seen aluminum tube stock. Most other metals do this less, but I imagine that iron and lead pipes may slow the fall of a close-fitting "rare earth magnet" a little in comparison to nonconductive pipes. - Don Klipstein ) |
"Jan Panteltje" wrote in message
s.com... On a sunny day (Tue, 22 Jun 2004 08:21:58 GMT) it happened "Greysky" wrote in : ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! There is a big magnetic iron core if you dig deep enough. There are stars with an extremly strong magnetic field, very very strong. We need a composite (non metal) spaceship. hehe Actually, I think the metaphasic shield gets around that problem. Cheers! Rich |
In article ,
Don Klipstein wrote: Most other metals do this less, but I imagine that iron and lead pipes may slow the fall of a close-fitting "rare earth magnet" a little in comparison to nonconductive pipes. #chuckle# More than a little, in the case of an iron pipe! -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
"Don Klipstein" wrote in message ... In article , Steve wrote: --------------9002068B3CF78CE28C8CE7B3 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit what does it do?? They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? The magnet moving down the pipe induces eddy currents. These eddy currents produce an electromagnetic force that resists the movement of the magnet (with respect to the pipe) and does so to an extent varying directly with the speed at which the magnet is moving. This slows down the magnet. At least this is what I have heard. And aluminum tubes do this also, just not quite as much as copper ones do. And I have seen aluminum tube stock. Most other metals do this less, but I imagine that iron and lead pipes may slow the fall of a close-fitting "rare earth magnet" a little in comparison to nonconductive pipes. Well, iron for sure. |
On Tue, 22 Jun 2004 08:21:58 GMT, "Greysky"
wrote: ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets Strip down an old microwave oven, but be careful of the HV cap, it may still be charged. (about 1uF at 3000v !!!!) Every one I have found has a bleeder resistor acros it, so is safe, but you never know. Anyway, remove the Magnetron and pull it to bits, 2 nice "doughnut" ceramic magnets await you. Barry Lennox |
One good way to make a dramatic experiment is to get two identical Neodymium-Iron-Boron magnets, permanently demagnetize one by subjecting it to heat, and comparing how they perform in the copper pipe. You could look up the demagnetizing temperature[1] and rig up a thermometer, but it's easier to hold a small compass near the magnet as you heat it. You could also try degaussing it with a powerful AC electromagnet. [1] See irreversible demagnetization versus temperature curves at http://www.component.tdk.com/eneor_mg.pdf Also see: http://www.scitoys.com/scitoys/scito...s/magnets.html http://www.rare-earth-magnets.com/ma...agnets_FAQ.htm -- Guy Macon, Electronics Engineer & Project Manager for hire. Remember Doc Brown from the _Back to the Future_ movies? Do you have an "impossible" engineering project that only someone like Doc Brown can solve? My resume is at http://www.guymacon.com/ |
They are magic, aren't they? Have you tried the drop a magnet down a
copper pipe trick? Hi, see some more experiments at http://www.scitoys.com/scitoys/scito...html#magnetism BR from Ivan OK1SIP |
"Greysky" wrote in message om...
... My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! A retail source of super strong magnets is at http://www.abcmagnet.cz/ BR from Ivan OK1SIP |
On 23 Jun 2004 03:04:40 -0700, (OK1SIP) wrote:
"Greysky" wrote in message om... ... My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! A retail source of super strong magnets is at http://www.abcmagnet.cz/ BR from Ivan OK1SIP In the US, Edmund Scientific at http://scientificsonline.com/ has long been a good source for all sorts of science "toys" like magnets. Happy trails, Gary (net.yogi.bear) ------------------------------------------------ at the 51st percentile of ursine intelligence Gary D. Schwartz, Needham, MA, USA Please reply to: garyDOTschwartzATpoboxDOTcom |
In article , Steve Nosko wrote:
"Paul_Morphy" wrote in message ... "JW" wrote in message ... On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? I'm guessing some EMF is induced. ...and... continue with the line of reasoning... What does that EMF produce and where?... Current in a closed loop or two in the pipe, and heat in the pipe. - Don Klipstein ) |
"Don Klipstein" wrote in message ... In article , Steve Nosko wrote: "Paul_Morphy" wrote in message ... "JW" wrote in message ... On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? I'm guessing some EMF is induced. ...and... continue with the line of reasoning... What does that EMF produce and where?... Current in a closed loop or two in the pipe, and heat in the pipe. Back up a bit. What does the current in a loop produce well before the heat builds up?... -- Steve N, K,9;d, c. i My email has no u's. |
Steve Nosko wrote:
"Paul_Morphy" wrote in message ... "JW" wrote in message . .. On Tue, 22 Jun 2004 13:06:08 GMT (Steve J. Noll) wrote in Message id: : Have you tried the drop a magnet down a copper pipe trick? I'll bite. What happens? I'm guessing some EMF is induced. ...and... continue with the line of reasoning... What does that EMF produce and where?... Hmmm, sorta like a rail gun in reverse? |
"Greysky" wrote in message m... ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) Thanks.! not that you would want to destroy one, but some PMI servo disk motors have six to eight very large cylindrical rare earth magnets in them. IIRC they are about 1.5 inch diameter by 1/4 inch thick or so. I had one with a bad disk that yeilded some of these a few years back. |
"Don Klipstein" wrote in message
... In article , Steve wrote: --------------9002068B3CF78CE28C8CE7B3 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit what does it do?? They are magic, aren't they? Have you tried the drop a magnet down a copper pipe trick? The magnet moving down the pipe induces eddy currents. These eddy currents produce an electromagnetic force that resists the movement of the magnet (with respect to the pipe) and does so to an extent varying directly with the speed at which the magnet is moving. This slows down the magnet. At least this is what I have heard. And aluminum tubes do this also, just not quite as much as copper ones do. And I have seen aluminum tube stock. Most other metals do this less, but I imagine that iron and lead pipes may slow the fall of a close-fitting "rare earth magnet" a little in comparison to nonconductive pipes. I imagine an iron pipe would slow its fall speed to zero. ;-) |
ever since I was a child, magnets have held a fascination for me. I've been
....[snip].... My question is does anyone know of other sources either for ... magnets that I may be missing out on? .... Every microwave-oven tube has TWO quite-strong cylindrical magnets. You have to tear the tube apart to retrieve them, but if you'll stack 6-8 of them with opposing poles on a loose-fit wooden dowels with some kind of stop on the ends, I'll guarantee you that any kid who sees the toy will practically wear it out playing with it. (Even sitting on the shelf it looks magical, what with the magnets "floating" in air.) --Myron. -- Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) |
sci.electronics.design,sci.electronics.components, rec.radio.amateur.homebrew,
"Greysky" wrote: ever since I was a child, magnets have held a fascination for me. I've been collecting them ever since. It used to be that you could always scrounge loudspeakers for Alnico magnets. Then when the newer ceramic magnets began to be incorporated into loudspeakers, it became a challenge to remove them from their enclosures without breaking them. Now, I have to admit, I am having a ball collecting the new 'super magnets' - like the ones inside hard drives. There are also cool cylindrical magnets that you can get from inside the heads of VHS machines. My question is does anyone know of other sources either for Neodymium 'duper magnets', or strong ceramic magnets that I may be missing out on? Like other posters, I've gotten some good ones out of some 5" full-heght 30MB hard drives, and the ceramic donut magnets inside microwave ovens. There are also some small, moderately strong (apparently a step below Neodymium) magnets in many small earphones/headphones (the kind for Walkman type portable stereos with the 1/8" plug), that I've bought surplus for a dollar each. But some of these have a little ceramic ring/donut magnet that's about next to useless. Magnets like these come closest to being perpetual motion machines we have yet to make, and I'd hate to have some just wind up into the trash because I didn't know they were there :-) There's this fun link that was posted a few months ago. http://www.houseofscience.com/ouch/ouch.html Thanks.! |
On Sat, 26 Jun 2004 17:56:26 -0400, Ben Bradley
wrote: There's this fun link that was posted a few months ago. http://www.houseofscience.com/ouch/ouch.html Love it. This has been a very interesting thread but now I have even more reason (than my other unfinished projects or ideas) to not order some of these cool magnets. |
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