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Magnetic Scale DRO's and using other Magnets on Mill

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  • Magnetic Scale DRO's and using other Magnets on Mill

    A stupid question from a complete beginner. That said, here it is. . .

    I am putting a magnetic scale style DRO on my milling machine. Will the magnetic scales or reading heads be damaged or generate measurement errors if I use strong magnets to attach items to the mill. Example, magnetic base that hold DTI's, or magnets to hold plastic chip guards covering ways of z-axis column and back of y-axis, etc?

    Thanks in advance.
    Take Care,

    Jim. . .

  • #2
    It shouldn't have any effect, the inductive pick up on the scale usually has a two secondaries that are excited from a high frequency primary.
    http://www.meas-spec.com/downloads/P...f_the_LVDT.pdf
    The stationary field from a magnet does not normally affect them.
    Max.

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    • #3
      Originally posted by MaxHeadRoom View Post
      It shouldn't have any effect, the inductive pick up on the scale usually has a two secondaries that are excited from a high frequency primary.
      http://www.meas-spec.com/downloads/P...f_the_LVDT.pdf
      The stationary field from a magnet does not normally affect them.
      Max.
      Thanks Max.
      Take Care,

      Jim. . .

      Comment


      • #4
        Well, I think that depends a bit on the type of magnetic scale. If it's indeed using a transformer principle you're fine, however if you're using a magnetic tape I wouldn't touch the tape with the magnet. A magnetic chuck a few inches away I wouldn't be too worried about though.

        Igor

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        • #5
          Originally posted by ikdor View Post
          Well, I think that depends a bit on the type of magnetic scale. If it's indeed using a transformer principle you're fine, however if you're using a magnetic tape I wouldn't touch the tape with the magnet. A magnetic chuck a few inches away I wouldn't be too worried about though.

          Igor
          I bought the Electronica magnetic scale kit sold by DRO PRO in the U.S. I'm not sure how that kit factors into the type of scale you describe, but the magnets I use to on the mill are definitely within 2" - 3" from where the scales will be mounted.
          Take Care,

          Jim. . .

          Comment


          • #6
            The 'Magnetic Tape' or the Ferrand Inductosyn principle is also pretty immune to any outside interference.
            http://www.ruhle.com/rotary%20transducers.htm
            Shows rotary type, but linear is the same principle.
            Max.

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