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Question:

why isnt copper and aluminum magnetic? what is the theory behind magnetism?

if you know a good site to find the information please include it.

Answer:

that's a tricky thing to do. axles are made of tempered steel and in order to straighten it (without breaking it) you need to heat it so it softens to bend then you need to temper it again. i'd get a used one from a junk yard.
yes you can straighten it.you will need a vice and if you have a torch it would make it alot easier.take the axle off putt it in a vice and beat it straight with a heavy hammer or sledge be carefull not to mess up the threads or lose your bearings or cotter pins when you remove it.the trick to it is to put the axle in the vice right up to the bend leave the bend on the top beat it straight then role on flat surface and correct as needed
Atoms have electrons surrounding them with different energies, in what is called suborbitals. Only two electrons can occupy a sublevel, each with different spins -- one clockwise, one counterclockwise. In magnetic materials, or materials that can be magnetized, the two electrons spread out into two suborbitals and have the same spin. Magnetic materials have domains of groups of like-spin electrons. In iron, these domains extend throughout the whole piece of material. When trying to magnetize materials that can be magnetized, the material is stroked with a magnet, which aligns all the domains of like-spin electrons in the same direction, which magnetizes the piece. This is done by passing the material to be magnetized through a chamber of high magnetic flux, stroking the material to magnetize it. Not all materials can be magnetized. It is necessary that they have two suborbitals, each with one electron.

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