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NEODYMIUM SUPERMAGNETS
SOME DEMONSTRATIONS
- Bill Beaty 1994, updated: 12/2005




WARNING: if you mess with TWO neodymium supermagnets, you are bound to pinch your fingers if you let them come together. This REALLY HURTS, it's like pliers. Also, you should wear safety glasses, since when two NIB magnets slam together, they tend to launch tiny chips at high velocities. I've had 3/4" magnets acidentally fall together and be completely shattered. The things are brittle! The ones larger than 1/4" are NOT FOR UNSUPERVISED CHILDREN!

NEW DANGER: swallowed magnets can cause lethal stomach problems. See www.rsna.org


Always keep magnets away from credit cards, wind-up watches, laptop harddrives, etc. I've erased several credit cards by accidentally passing an NIB magnet near my pocket, or letting one fall into my lap. This article is from 1995, so I should probably still warn against floppy disks and VHS tapes...

Links:

 


> ONWARD TO THE DEMONSTRATIONS >

WARNING: if you mess with TWO large neodymium magnets, you are bound to pinch your fingers if you let them come together. This REALLY HURTS, it's like pliers. Also, you should wear safety glasses, since when two big NIB magnets slam together, they tend to launch tiny chips at high velocities. I've had 3/4" magnets acidentally fall together and be completely shattered. The things are brittle! LARGE MAGNETS NOT FOR UNSUPERVISED CHILDREN! For kids, use NIB magnets under 1/4" across.

NEW DANGER: swallowed magnets can cause lethal stomach problems. See www.rsna.org

Always keep magnets away from credit cards, wind-up watches, laptop harddrives etc. I've erased several credit cards by accidentally passing an NIB magnet near my pocket, or letting one fall into my lap. This article is from 1995, so I should probably warn against floppy disks, VHS tapes, and non-monochrome video displays. DANGER, DANGER, NEO MAGS CAN MAKE YOUR AUDIO CASETTE TAPES SOUND MUDDY, since they erase the "highs" less than the bass. And if you have an expensive one the size of a hockey-puck, you can ruin someone's entire 8-track tape collection in a few moments. Stick it in yr back pocket and wave yr butt around.

 

WHERE TO GET 'EM

Many inexpensive NIB magnets from WONDERMAGNET, go here to order. (an EXCELLENT source!)

For tiny spheres and huge slabs, try Mr. George Magnets

Teachersource.com has supermagnets & toys

Big Copper Tube + magnets, $33

CMS Magnet

Magnets 4 Less, disks, cylinders, blocks, very low price

Neoworld, small spheres, blocks

All Electronics, lots of misc sizes

Rotometals bulk bismuth cheap (no magnets), http://www.rotometals.com/Bismuth-s/4.htm

KJ Magnetics, magnets, sculpture kits.

Scitoys, magnets, floating graphite

EUROPE: Supermagnete, also in (Deutsch), (Francais)

DuraMag, http://www.duramag.com/rawmat/neosizes.htm, large inexpensive disks and blocks

Gaussboys

"Amazing Magnets"

Arbor Scientific (www.arborsci.com

Herbach & Rademan (mail order surplus) 800-848-8001 ($25 minimum purch)
http://www.herbach.com a science/electronics surplus supplier, they carry several inexpensive odd-shaped NIB magnets including an extremely strong 1" disk for $25.
Call for their current "this month" catalog

Arbor Scientific, Ann Arbor, MI,  1-800-367-6695  http://www.arborsci.com

Lee Valley Tools http://www.leevalley.com


Tridus International, 310-408-2222, Paramount, CA (VERY low prices, but
$250 minimum.  Ask for MgOe:30 neodymium, its plenty strong but not
hyper-expensive)  www.tridus.com

Master Magnetics ???

Magnet Sales Inc., 1-800-421-6692, 
http://www.magnetsales.com

Magnets Are Us Inc
South Bend, IN
1-800-470-3350

Surplus suppliers: many mailorder suppliers carry 1" trapezoidal NIB
magnets removed from computer hard disk head position motors.  H&R, Am.
Sci. Surplus, All Electronics, and others.  See:
http://amasci.com/supliers.html or try Wondermagnet.

Or as Mike H. suggests, find old hard-disk drives and tear 'em apart to
get those magnets for free!  NIB magnets are used in the head-positioning
linear motor.  They are arc-shaped and flat, stack them for extra
strength.

 

> ONWARD TO THE DEMONSTRATIONS >



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http://amasci.com/neodemo.html
Created and maintained by Bill Beaty. .