Number of Contact Points Required

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  • Number of Contact Points Required

    I have seen quite a bit of debate on here concerning the number of hits to take for the measurement of plane, line, & circle features. I have been following a NPL (UK) Measurement Good Practice Guide for the last couple of years and I feel has helped me tremendously in my precision and repeatability of measurements and thought I would share it with all of you who have helped me through the past couple of years in my transition from MMIV to PC-Dmis. It goes into quite a bit of detail concerning the number of recommended hits and also goes into detail about the distribution of hits beginning on Page #25 of the GPG No. 41 titled CMM Measurement Strategies.

    I've never heard anyone on here mention any of the NPL guides, but on this website: http://www.npl.co.uk/length/gpg.html, there are several guides that are very helpful to beginning and advanced metrologists. I haven't had time to go through all of them but at first glance some of them look extremely helpful. I think we paid $40 for each one of the guides a couple of years ago but now most of the guides are being offered for free.

    The main link for the NPL Measurment Good Practice Guides is located here at:
    http://www.npl.co.uk/publications/good_practice/.
    Last edited by rangerboat72; 01-24-2007, 04:47 PM.
    sigpic
    Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
    PCDMIS 2012
    Windows Office XP

  • #2
    thanks much
    sigpiccall me "Plum Crazy"....but you only go around once!

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    • #3
      Thanks
      Mr. Comment
      SCIROCCO-NT 13-20-10
      B3C-LC Controller (Leitz Protocol), SP600M, TP200
      PCDMIS CAD++ v4.3 MR1(Build: 12/11/08)
      sigpic

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      • #4
        I just downloaded 41,42,and 43 and they were all free.

        So thanks for the info.....
        sigpic

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        • #5
          Originally posted by MrComment View Post
          Thanks
          No problem...

          It sure has helped me prove to our customers that I have gone the extra mile (by doing my homework) when it comes to measuring their parts.
          sigpic
          Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
          PCDMIS 2012
          Windows Office XP

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          • #6
            Thanks guy, this is real good!


            Jan.
            ***************************
            PC-DMIS/NC 2010MR3; 15 December 2010; running on 18 machine tools.
            Romer Infinite; PC-DMIS 2010 MR3; 15 December 2010.

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            • #7
              Originally posted by Jan d. View Post
              Thanks guy, this is real good!


              Jan.

              You are welcome! I was shocked by how good some of the information was and the fact that it was free. Most of my college textbooks that covered metrology & coordinate measurement never went into near the detail some of this stuff does...
              sigpic
              Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
              PCDMIS 2012
              Windows Office XP

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              • #8
                Very nice, thank you for the link!!!
                sigpic

                James Mannes

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                • #9
                  Thanks for that - Ranger...

                  Had something similar way back but lost it -
                  PC-DMIS CAD++ 3.7 from 4.2 MR1

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