The m0490a is an 4mm axially magnetized cylinder 9mm in length with a 3x6mm n52 core. If you’re looking for something sense-y, this is probably not the one for you. At nearly .4 grams, it’s a about 2x as heavy as the m0426a with a field strength measured at ~1450 G (compared to the ~2100 G of the former), in short, that’s a lot to over come without much power. But it does feature dramatically more surface area for lifting shenanigans.
If this isn’t the magnet you’re looking for–no worries! We’ve got some other exciting options in the pipe: m1147a (FS 2900 G, 2g) and m0420a.
If you have 1 big magnet and you use it to lift something relatively large, it puts a quite a lot of force/pressure on a single area. With smaller magnet you can have them spread around more and probably in new places so you can lift heavier objects without putting a lot of pressure on a single spot.
Or is my logic wrong?
Eventually they will pull together and the last mm can pinch and kill tissue as the force goes up exponentially, but that is recoverable for the most part. The real issue is the grinding of magnet coating against magnet coating. That will cause failure eventually.
While our x-series transponders have tested as compatible with MRI machines up to 7T field strength, all magnetic products are incompatible with MRI machines and procedures.
But if you click the link it says x-series are only tested to 3 Tesla, not 7.
would mounting x4 m0426’s in a single package and resing coating it be advantageous. im only saying this because i like the idea of a small 4x9mm magnet?
Based on my observations, not likely. An axial cylinder doesn’t seem to make sense with a ratio of diameter to length 1:< 5 (emphasis on “seem”–at least in the size context we are using of 3-4mm in diameter).
Basically, the shorter it is, the more rapid the decline in field strength to the midpoint where the poles switch. Which is whty we are going to offer a diametric version
It seems like all the field going into your body would be mostly unusable for lifting, if you could take that and point it towards the thing you want to lift, it’s more magnet per magnet
A Halbach array (typically using multiple magnets oriented at specific angles) focuses the flux on one side and cancels it on the opposite side.
This focusing effect can increase the surface field strength by about 1.4× to 2× compared to an equivalent single magnet, depending on the number of segments and geometry.
For an ideal continuous Halbach cylinder, the theoretical increase in field on the strong side can be up to ~2× compared to a single diametric magnet of the same outer dimensions.
So basically it’s more about making one pole or side stronger than it would normally be for a given magnetic mass, and less about reducing field on the opposite side. In my mind, HBAs were mostly about trying to achieve a mono-pole, and I was unaware that the side effect of this is that one pole has slightly higher field output than normal.
