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magnetized chips

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  • loose nut
    replied
    I'll just wait until the earths magnetic fields reverse (any day now) and save myself the shipping.

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  • The Artful Bodger
    replied
    If you have expensive machines and tools that have become magnetized just send them to me where the environmental lines of flux are going the other way and they will be cured.

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  • Toolguy
    replied
    The easy fix is to get one of those $30 plug in demag boxes. One swipe over that and you are demagged.

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  • darryl
    replied
    I can see there being a nano-scale mechanical vibration at the root of this. Perhaps in some cases an oriented vibration or a sympathetic resonance is able to effectively align molecules such that the symptom of magnetization occurs.

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  • Don Young
    replied
    I "never say 'never'' but I don't think it is possible for cast iron to become magnetized. I would appreciate hearing about anyone who has done it.

    Originally posted by dian View Post
    that would mean, there is no danger magnetising a mill by putting magnets on it?

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  • dian
    replied
    that would mean, there is no danger magnetising a mill by putting magnets on it?

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  • Don Young
    replied
    It is quite common for steel to become slightly magnetized from the earth's field when it stays stationary for years. Hammering speeds up the process. Cast iron is very magnetic but does not retain any significant magnetism when the magnetizing force is removed.

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  • JoeLee
    replied
    Oh, but it will one of these days.

    JL...............
    Originally posted by dian View Post
    glad than never happened to me yet.

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  • dian
    replied
    glad than never happened to me yet.

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  • JoeLee
    replied
    The same thing happens when you take a file to a piece of steel, sometimes the filings become magnetized and stick to the file.

    JL..........................

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  • ahidley
    replied
    Banging on it will magnitize it. As will a dull endmill cutter or a vibration

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  • dian
    replied
    recently i bought a peice of 22 x 14 mm keystock and to my surprize its fairy magnetic. now, these are 6 m bars stocked on shelves. what might these guys have done to make it magnetic?

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  • loose nut
    replied
    Originally posted by Blackadder View Post
    don't align your lathe North and South ( just joking )

    if you hammer a piece of iron that is north and south it will become very weakly magnetised

    I get it rarely as well, I have put it down to the stock being lifted at the stock yard with a magnet crane

    just my 2 cents

    Stuart
    I aligned it east and west for just that reason and I rarely beat on it anyway.

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  • ikdor
    replied
    Originally posted by winchman View Post
    So, how should I orient this while hammering on it to keep it from becoming magnetized?

    Hammer it while it's rolling down hill...
    Igor

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  • winchman
    replied
    So, how should I orient this while hammering on it to keep it from becoming magnetized?

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