Inside groove diameter measuring skill

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  • Inside groove diameter measuring skill

    Hi Guru,

    Any suggestion on how to measure inside groove diameter accurately with CMM?

    I have a 90 degree knuckle to build a probe which can be used to measure it but i haven't never use it before. How to build the probe and calibrate it? Can we use the same calibration tool to calibrate it?

    BTW, I haven't tried to use star probe yet. Any suggestion on how to use and calibrate it? Thanks

  • #2
    Have you done a search for this info? There's a lot to be found.
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    • #3
      The easiest way is to use a disc, which can then be used to measure a groove at any given probe head angle, it's relatively simple to calibrate and easy to program. With a star probe you have to tell the CMM which tip (modal) you are using to make contact with.

      I have rotated the probe head in the B axis with A fixed in two situations:
      i) With one stem of a star probe assembled, where the bore diamter is too small for a full star probe assembly to fit, where A was fixed at zero.
      ii) Where the bore diameter was large 6" and deep 7" and the probe head/column would have interfered with the top face, where A was fixed at 30 or thereabouts using an 80mm long ball stylus.

      What is the dia of bore, groove depth (radially) groove width, depth of groove, form of groove (sq/rad) as these determine what methods/tools you can actually use.
      Mnfctr: Hexagon,
      Model: Global B Perf,
      Hardware: Control FBII,
      Software: PcDmis CAD 2010MR3
      PH10MQ, TP20, Leitz equipped

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      • #4
        [QUOTE=johnP;334666]Have you done a search for this info? There's a lot to be found.[/QUOTE/]

        Any suggestion for getting a better search on this topic? Thanks,

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        • #5
          [QUOTE=homer.tan;334709]
          Originally posted by johnP View Post
          Have you done a search for this info? There's a lot to be found.[/QUOTE/]

          Any suggestion for getting a better search on this topic? Thanks,
          https://www.google.com/search?num=10...roove+diameter
          One screenshot is worth a thousand Need more info
          Never attribute to malice that which is adequately explained by stupidity...

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          • #6
            Originally posted by AlexA View Post
            The easiest way is to use a disc, which can then be used to measure a groove at any given probe head angle, it's relatively simple to calibrate and easy to program. With a star probe you have to tell the CMM which tip (modal) you are using to make contact with.

            I have rotated the probe head in the B axis with A fixed in two situations:
            i) With one stem of a star probe assembled, where the bore diamter is too small for a full star probe assembly to fit, where A was fixed at zero.
            ii) Where the bore diameter was large 6" and deep 7" and the probe head/column would have interfered with the top face, where A was fixed at 30 or thereabouts using an 80mm long ball stylus.

            What is the dia of bore, groove depth (radially) groove width, depth of groove, form of groove (sq/rad) as these determine what methods/tools you can actually use.
            Thank you, Alex,

            The groove is a cylinder inside a tube. The groove diameter is .912+0.002/-0.000, its outside cylinder(within the tube,I.D) diameter is 0.765+/-0.002;another groove is 1.037+0.002/-0.000, its outside cylinder(inside the tube,I.D) diameter is 0.906+/-0.002. the tube cylinder O.D is 3.210+-0.005.

            Groove width is about .140+/-0.02

            Please feel free to raise up your concerns and I'll try my best to answer your question,

            Thanks,

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            • #7
              You didn't say what the groove position is in the tube but I'd suggest this off the shelf stylus. Renishaw A-5000-3615 - 12.7dia 2.2mm thick, here's the probe file data for it that I recently created. The stylus is quite heavy so isn't suited for large extensions in the horizontal position but hopefully it may suit for you.

              ITEM:TIP12.7BY2.2MMDISK M3
              comment A-5000-3615
              begintip
              ribcount 10
              color 142 142 142
              cylinder 0 0 0 0 0 -4 4
              cone 0 0 -4 4 0 0 -7 3.5
              cylinder 0 0 -7 0 0 -28.5 3.5
              cylinder 0 0 -28.5 0 0 -30 6
              cylinder 0 0 -30 0 0 -32 12.7
              hotspot 0 0 -31 0 0 1 12.7 2.2 disk
              endtip
              Mnfctr: Hexagon,
              Model: Global B Perf,
              Hardware: Control FBII,
              Software: PcDmis CAD 2010MR3
              PH10MQ, TP20, Leitz equipped

              Comment

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