| Author | Message | ||
     Anonymous |
could I use the small rare earth magnets from radio shack to levitate small pieces of pyrolytic graphite? | ||
| Simon Quellen Field (Sfield) |
The Radio Shack magnets are only 27 megagaussoersteds. Ours are 48 megagaussoersteds, and are thus almost twice as powerful. You may be able to levitate the graphite with the Radio Shack magnets, but it won't be as high or as easily done. | ||
| Anonymous |
With those magnets from radioshack, I tried to replicate the magnet in mid air project, but I used alluminum in place of the bismuth. It was extremely hard to adjust the ring mangets to the right point, but the little magnet does float, but barely. The ones that I bought were 30 MGO. One more question; If I can melt a bunch of those rare earth magnets into one, would the magnetic strength or the MGO increase? | ||
| Simon Quellen Field (Sfield) |
Replace the aluminum with pyrolytic graphite and it will be much easier to adjust, and the separation between the plates and the magnets can be made much larger, resulting in a more impressive levitation effect. Even bismuth would be much better than aluminum. The effect is stongly affected by the strength-to-weight ratio of the magnet. Using 48 MGOe magnets will get better separation and less tricky adjusting. The magnets are sintered, not melted. Heating the material causes it to lose its magnetism. Heating it enough to melt it would change the crystal properties that make it a good magnet. Simply using a larger magnet, or putting several magnets together, would increase the total flux, but not the intensity of flux density. In other words, it could lift more, but would not levitate better. | ||
| Ian Nelson (Unregistered Guest) Unregistered guest Posted From: 24.71.223.140 |
IN the magnet in mid air project could you replaced the 12 ceramic ring magnets with 20mm neodymium-iron-boron magnets and how many would you need? Could the space between the two Bismuth plates be increased if you added the neodymium-iron-boron magnets to the other 12 top magnets? Could the small NIB magnet be repaced with a larger version, and if so would i need more, top magenets, larger bismuth plates, or just lower the magnets closer to the bismuth plates, or do nothing? Thank you | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 811 Registered: 12-2004 |
The top magnet can be one of our 12 millimeter cubes. One of our cubes is actually much stronger than all of the RadioShack magnets in the original design. The stronger the top magnet, the more distance you will get between the floating magnet and the diamagnetic plates. The floating magnet can be any size. What is important is its strength to weight ratio. Our 50 MegaGaussOersted magnets are the highest strength magnets commercially produced. As the technology improves, we will offer stronger magnets. |
