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Dr. Drone

Tue Apr 04 2006, 03:04AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

Matt631

Tue Apr 04 2006, 03:32AM

Registered Member #364 Joined: Mon Apr 03 2006, 10:00PM
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Posts: 3

I used to have 2 small cylindric NdFeB magnets that I played with all the time until they smashed themselves to peices. I got cut up pretty bad one time when a stainless steel spoon flew from one of my hands to the other that was holding the magnet and got me right in the skin between my pointer and thumb. They also snapped on my friends shirt one time and ripped a hole in it. Good times...

...

Tue Apr 04 2006, 03:48AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Gotta love neos

I have tons of them, my favorite being my 3/8" cubes; all sorts of uses for them. I use one as the source foe my passive levitator (a piece of graphite with a magnet above it, such that when you place a small magnet on the graphite it floats a few mm), 4 in a 2x2 grid for my other passive levitator (4 magnets with a piece of graphite floating on top), or if I drop a screw in the grass I grab the grid and hold it inside my palm, and run my hand through the grass--works like a charm

It is also fun to drop one down a sheet of aluminum, they don't stick but they move slower than normal because they are fighting the eddie currents in the aluminum formed when they move.

Dr. Drone

Tue Apr 04 2006, 04:14AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

stop4stuff

Tue Apr 04 2006, 06:49AM

Registered Member #64 Joined: Thu Feb 09 2006, 06:25AM
Location: Southampton, UK
Posts: 68

Neos are most excellent :)

I've been playing with them for a few years, I even helped run a website selling them.

My diamagnetic levitation jig uses 6 25mmx6mm neo discs as the lifter magnet.

links to a few images;
Small ring coated with ferrofluid
wok hanging off a 5mmx5mm cylinder
1000+ neos on my fridge , the packet on the floor contains approx 200 10mm cube neos

Drop a neo magnet inside a vertical aluminium or copper tube... watch it genlty float down the tube.

Neos and aluminium are commonly used in roller coaster braking systems.

As previously mentioned tho, take care with neos, they can bite... the bigger the neo the harder the bite and don't put large neos in trouser pockets

neos can shatter if slammed together and small shards can be ejected at high speed causing shrapel type wounds

You can find neo magnets in hard drives, modern drives usually have a single smallish magnet the older the drive, the bigger the magnet, some very old (1mb etc) drives have 2 large magnets in them.

paul

Desmogod

Tue Apr 04 2006, 08:00AM

Registered Member #139 Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358

stop4stuff wrote ...

As previously mentioned tho, take care with neos, they can bite... the bigger the neo the harder the bite and don't put large neos in trouser pockets

Oooo, the thought of it makes me whince. Although I'm sure you could set up a website selling them for that purpose alone.
Reminds me of the time I had a set of keys and a 9V battery in my pocket, sat there having a pint and wondering why my leg was getting burnt.....

Avalanche

Tue Apr 04 2006, 08:09AM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

You can make decent little alternators with those magnets, for use in wind turbines, etc. Check out some of the designs on

...or they are also good just for playing about! I've bought loads off eBay, but never put them to any real use

HV Enthusiast

Tue Apr 04 2006, 11:37AM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

I have a bunch of these, mostly 1" x 1" cubes - they are fun, but can be dangerous, especially to young children, or even yourself if you're not careful!

Steve Conner

Tue Apr 04 2006, 12:25PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Safety note: If you have any metal surgical implants, don't go near stop4stuff's fridge, you may be stuck to it permanently

I have a couple of small NIB magnets and I was amazed at how much stronger they are than ordinary ceramic ones. Right now my kitchen is also my workshop, and I use them as uber fridge magnets that can stick whole sheaves of papers and schematics to my fridge.

They also make loudspeakers with neo magnets that are a lot lighter and more compact than the usual ceramic ones of the same power rating. I would get them for my bass guitar amp but they're also a lot more expensive

stop4stuff

Wed Apr 05 2006, 12:42AM

Registered Member #64 Joined: Thu Feb 09 2006, 06:25AM
Location: Southampton, UK
Posts: 68

another safety note;

neo magnets can kill if swallowed!
see

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