Calibration Start and End Angles for disk probes

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  • Calibration Start and End Angles for disk probes

    Again I am new for disk probes is there a preferred angle range being they are not spherical it puzzles me.

  • #2
    I have an 8mm disk and I have my start angle at -5 and end angle at +5.

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    • Douglas
      Douglas commented
      Editing a comment
      on a 25mm disc I went with -3 and +3.

  • #3
    If your disk probe is really a slice of a cylinder you have a problem. PC-DMIS assumes the disk is a slice of a sphere.
    AndersI
    SW support - Hexagon Metrology Nordic AB

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    • #4
      hello

      you can use this calculation to figure out ur start-end angle.


      example:

      18mm disc dia x 2mm thick
      Calibrate using only 70% of the disk thickness (out of square comp.)

      2mm x .70 = 1.4mm

      half of 70% thickness
      1.4mm / 2 = .7mm
      Half probe dia.
      18mm/2=9mm
      Calculate the angle from horizontal center line to half disk thickness

      SineA= .7/9
      A=4.4º

      Start angle -4.4º
      End angle 4.4º

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      • Douglas
        Douglas commented
        Editing a comment
        nice, I actually made a drawing of my disc and sphere to figure out what angle contact at the corner of the disc starts, then scaled back a bit. This approach simplifies it

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