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  • magnetized chips

    All of a sudden I am getting magnetized chips when I'm milling a bit of steel, ordinary crapolium (A36 or 44w) nothing special. Has anybody else had this happen and is there a way to stop it.
    The shortest distance between two points is a circle of infinite diameter.

    Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

    Southwestern Ontario. Canada

  • #2
    Yes sir, I've had it happen many times before. Not sure what the cause is, friction and static perhaps. It seems to happen to the harder steels from what I've noticed.
    What annoys me more than chips sticking to the cutter is when they stick to the tips of your calipers.

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

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    • #3
      Yes, it's happened to me- not often, but it's not a rare event either. So far I haven't come up with a good explanation, at least not one that survives a good analysis. Maybe nano-science can come up with the answer.
      I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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      • #4
        Cut aluminum instead.

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        • #5
          I'm going to have to guess that the friction between the cutter and the material being cut is creating a static charge which in turn is magnetizing the chips, sort of like an electro magnet. Ever wonder what causes your mics or other tools to become slightly magnetized even if you never had them near any magnetic field. Ball bearings can become slightly magnetized also, same reason friction.
          I'm sure someone else can give a more scientific explanation of why this occurs than I can.

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

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          • #6
            My guess is that the stock is slightly magnetic to begin with. The field is weak enough so as not to be noticeable in bulk, but obvious in the chips.

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            • #7
              That sounds like a likely answer. Thanks.
              The shortest distance between two points is a circle of infinite diameter.

              Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

              Southwestern Ontario. Canada

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              • #8
                Magnetism is mysterious, no one has been able to satisfactorily tell me what it is yet, what it does yes how it does it yes but what is it, i wonder how big a magnetic domain in a ferrous material is? They all cancell out and are jumbled in a lump of metal, its monolithic and the sum of all the domains is zero, but when you chop it up by cutting, what then, can a bit of swarf contain a whole domain of the original bar? Or do the domains shrink to accomodate their new environment?
                If a bit if swarf was a whole domain then it would be like a bar magnet.
                I had noticed that in time the magnetic swarf gradually loses this property, does that mean that the domains are reforming like some weird recrystallisation ?
                More questions than answers im afraid, you can magnetise a rod by hitting it on the end, same thing perhaps?
                I dont understand this magnetism but thats why its fascinating.
                Mark

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                • #9
                  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

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                  • #10
                    So, how should I orient this while hammering on it to keep it from becoming magnetized?

                    Any products mentioned in my posts have been endorsed by their manufacturer.

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                    • #11
                      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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                      • #12
                        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.
                        The shortest distance between two points is a circle of infinite diameter.

                        Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                        Southwestern Ontario. Canada

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                        • #13
                          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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                          • #14
                            Banging on it will magnitize it. As will a dull endmill cutter or a vibration

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                            • #15
                              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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