Magnetic field strength

[Stiganator]

Hey guys,

I'm trying to make a floating box of sorts. I want to put several magnets on the bottom and then then some on the bottom of a box to "float" it.

I was thinking of holding about 10-15 kilos with about 2-3 cm of separation between the faces of the magnets.

I was looking on united nuclear at some 2 in diameter 1/4 in high disk magnets. You think 10 of those (2 sets of 5) is sufficient or could I use even smaller ones.

If you can provide me some formulas for force derived from opposing poles and carrying capacity that would be great.

Another thing, I was looking at shielding. Would sheet nickel really shield magnetic fields, I found some web sites but I wasn't sure or how well it would work.

Thanks.

 

[patentman]

Didn't you already post this about 3 months ago? I replied there as well. Anyways, for your convenience, my reply to your earlier message was as follows:

Originally posted by: patentman
This may answer your question regarding how to calculate the force exerted between two magnets. Although the calculation provided is for bar magnets and not cylindrical magnets, it is likely that it will be reasonably accurate in your case because most bar magnets and cylinder magnets are dipole magnets.

As for your comment about the "N" grade of your magnet, see this site

While I could explain how to calculate the field strength of a cylindrical magnet, the math is a bit complex and I'm not sure you really even want/need to know that much detail. Just use the calculator at this site

 

[Stiganator]

I thought I did, but I didn't see it in my list. Cheers.

Too bad that calculator is broken.

 

[patentman]

The site is still operational, but for some reason the link only works for a short time. Just go to www.dextermag.com, click the tools tab, tand then the magentic calculator button. It will take you to the right page. I don;t know why a direct link won;t work.