beansbaxter
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Posts: 5911
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posted October 22, 2004 11:05 PM
Why does carbon steel get magnetized on machining, grinding etc.
Carbon Steel gets magnetized when it is machined or grinded heavily. Why?
   
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slug
Pro
Out in search of my mind...
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posted October 23, 2004 03:03 AM
http://www.consult-g2.com/course/chapter2/chapter.html
that's closest i can find to any sort of explanation that might be helpful
basically mechanical shocks can align the magnetic domains in the metal, and machining is a series of shocks, all in the same direction.
a subsequent shock, or exposure to a strong and random magnetic field will erase this magnetism. also heat-treating the metal will demagnetize.
  
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swft
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Full throttle!
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posted October 23, 2004 05:21 AM
Yep, one of the oldest tricks in the book. Many the output shaft of a tranny that made a interesting magnet (and useless for anything else) after shearing off while drag raging.
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beansbaxter
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posted October 23, 2004 10:08 AM
If I take a carbon steel bar magnet and smack it with a hammer, it'll result in a much weaker magnet - many of the domains are no longer lined up. HOW do they change?
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banana bike man
Needs a job
Posts: 2023
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posted October 23, 2004 10:33 AM
because the act of "machining" lines up the molecules in the iron. This alignment causes magnatism.
You can also do this by rubbing a steel rod repeatedly from one direction.
Hit it with a hammer to remove the magnatism.
bBm
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slug
Pro
Out in search of my mind...
Posts: 1433
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posted October 23, 2004 12:51 PM
they're just electrons. a good solid thump can move them around. heck a little electricity will do that for ya 
but more technical: they are moving all the time. they have inertia, justlike everything else. albeit not nearly as much, but still they have momentum and want to continue to move where they were going
solid thump moves the bar quite sharply, the inertia may be enough to make them re-align.
just a theory, and probably not a good one but that's how i understand it to work.
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VincentHill
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posted October 23, 2004 03:14 PM
It Also Helps id the Piece is aligned North & South, then the heat and shock will allow the Molecules to have their north and south Poles in proper alignment!
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