Test:5 Magnetizing Experiments : Focusing cores, Helpful Or Not?

Test:5 Magnetizing Experiments : Focusing cores, Helpful Or Not?

In this video I test out some flux Focusing cores to see if it helps with the magnetizing process.

Thanks,
~Russ Gries

[laharlk]

make a mold, melt some old transformer core and then cast it. Iron-Sillicon should have higher saturation than just steel and hence focus more flux into the rod.

[beforebefore]

Hey... another minor thought...  Wouldn't "soft iron" material work better for the "focus cores"?

[Altcapball]

it would be better if you gave a better overview of what your wider intentions are, what are you trying to do, what for, why, etc.

[beforebefore]

(Hey Russ... it's me again!  ;-)
Whoa... I hope you realize the possibilities this opens (probably!)

Imprinting patterns on the edge of disc magnets becomes easy!  Using a pair of top/bottom focusing cores with identical "teeth" to put "spokes" of polarization on the edge of the disc.  The Neo slug/disc would sit inside of all the "teeth". Each pole-piece (focus core) would be slightly rotated from one another (1/2 of the inter-tooth spacing), so you have a series of arrangement along the circumference of the disc.

You'd want the "spokes/teeth" in contact with the outer edge of the magnet material to get maximum strength... which obviously means you need a custom set of "focus cores" for every different diameter magnet.

Mechanically align the two core halves with nylon (non-magnetic) posts to maintain the rotational offset during the process.

I would see the need for plenty of gap between each of the focus cores and the material being magnetized, so that you don't get a flat-surface magnetization effect... what you normally WANT, you now want to AVOID :-)  Nylon flat-disc spacers (same diameter as the magnet material) between the magnet and the cores... but I have no idea of the gap required... discovery by experimenting!  You could probably use slight variations in magnet material thickness with a given set of focus cores, by using different thickness nylon spacers.

I might have concerns about the "teeth" (spokes) being STRONGLY attracted to each other... so your nylon "gap fillers" may need to fill-in the empty spaces between the N and S teeth.. to hold them apart during the "pulse".

Thoughts?

[cavemanelectronics]

nice! love it when things work.
this may be a silly question but does your new jig retain some magnetism now, or how does that work?

[nRADRUS]

Focusing cores is not rare in physics experiments. Best way is use magnetodielectric material for cores, cuz whirling currents will reduce power of magnetizing in short impulse.

[Migueldeservantes]

Just wonder how many people notice the fluke.... and care to talk about what happen with that magnet! that is totally opposite of what happen to a normal magnet when it gets broken!!!