CMM Calibration

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  • CMM Calibration

    Does anyone know where I could find a somewhat detailed description of the tasks performed during an annual CMM calibration? Some individuals believe that a field service tech does not need to do this once a year but say every 5 years or so. You guessed it, they do not want to spend that much money (small company). I have never worked for a company that did not have the CMM cal'd annually, until now. They think I can do it (HA HA HA).

    Thanks
    Chillin' in CO

  • #2
    Looking at ASTM B89 would be a good start. Also, search for threads on calibration that Hilton Roberts has posted in. He is very well-versed in calibration and tracking how your machine is performing. His first question to you will be, "Do you have a "master part" or "widget" that you measure every day. Basically, measure the same part every day and chart the variation of some features. This alone will tell you when the machine is changing.

    Here is a link to one of the threads this was discussed in.
    Last edited by John Kingston; 01-31-2007, 08:11 AM.
    When in doubt, post code. A second set of eyes might see something you missed.
    sigpic

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    • #3
      I believe that with tracking the results with statistics of a measurement over a period of time as John stated is the only option for extending the calibration if your CMM.

      I did this on a Mitutoyo and Zeiss and got to almost 2 years before I started seeing variation in my data (beyond microns). Both of these CMMs ran virtually 24/6 for several years.

      Duane
      Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
      Contura Calypso 5.4

      Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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      • #4
        Originally posted by John Kingston View Post
        Looking at ASTM B89 would be a good start. Also, search for threads on calibration that Hilton Roberts has posted in. He is very well-versed in calibration and tracking how your machine is performing. His first question to you will be, "Do you have a "master part" or "widget" that you measure every day. Basically, measure the same part every day and chart the variation of some features. This alone will tell you when the machine is changing.

        Here is a link to one of the threads this was discussed in.
        What John said......

        Just for the curious...I have a machine that I was getting ready to extend.

        As I ran my 25 point baseline, point 19 and beyond went ape$hit.

        I cleaned the TP200 and the stylus module and ran 10 more points with no change.

        Thought either the machine got hosed or something wrong with the TP200.

        Swapped out the TP200 and stylus module and order was restored.

        Put in the old TP200 and changed the stylus module and order was maintained.

        Problem isolated to a stylus force module taking a dump.

        The lesson: If you do not know how well you measure your own "stuff" how can you afford to be passing judgement on products coming in to your lab?

        Send me an email if you want a copy of my paper proposing a measurement process that will help you measure better and more consistently as well as save you money by not requiring an annual calibration if your machine is not changing.

        We have not "calibrated" our machines in something like 3 years except for when we had some hardware break that required a calibration.

        If you are careful to baseline a machine from the initial calibration by the manufacturer when the machine is installed, you do not need annual calibrations unless the machine is changing. You will not know that unless you chart.

        That is the hard part of convincing American manufacturers the benefits of process control. They hear the money saving part but fail to heed the measurement part that requires monitoring of a process in order to determine whether or not the process is operating normally or needs assistance.

        Lemmie know if I can help!

        480-891-7263
        Hilton Roberts

        "Carpe Cerveza"

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        • #5
          I'll just post here so your not bombarded with e-mails. I'll take a copy please. Thanks
          Last edited by bw_bob; 01-31-2007, 02:55 PM.
          sigpic.....Its called golf because all the other 4 letter words were taken

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          • #6
            Hilton, Count me in also. My notebook(s) are probably already filled half way with stuff I have copied from the forum from you but I'll gladly make room.
            Sorry, emails are not provided by the forum anymore. Here's mine...

            Last edited by JamesMannes; 01-31-2007, 01:52 PM.
            sigpic

            James Mannes

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            • #7
              Originally posted by bw_bob View Post
              I'll just post here so your not bombarded with e-mails. I'll take a copy please. Thanks
              Ohhhhohhhhohhhohhhh!!!!! Me too! Maybe you should post it as an attachment if it is not too big. TIA
              sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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              • #8
                Me three!!!! I mean me too!!

                [email protected]
                Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
                Contura Calypso 5.4

                Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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                • #9
                  I highly recommend the read. It's well presented and it's in terms EVEN your boss could understand. Email him/her a copy and see what falls out of the trees.

                  Bill

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                  • #10
                    I also would like to take a look see...
                    TIA

                    Last edited by T Miller; 01-31-2007, 02:24 PM.
                    sigpic
                    if you had soap on a rope it would be tied to yer ankle

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                    • #11
                      Originally posted by Wes Cisco View Post
                      Ohhhhohhhhohhhohhhh!!!!! Me too! Maybe you should post it as an attachment if it is not too big. TIA
                      I think it is too big to post. Send me an email and I will follow the link back.
                      [email protected]
                      Hilton Roberts

                      "Carpe Cerveza"

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                      • #12
                        Mr. Hilton, as a regular of this forum, I very much look forward to your wit and wisdom on a daily basis. Your knowledge of CMMs and CMM capabiltiy is second to none, and I thank you for your dedication to this industry.

                        If you could be so kind, may I have a copy also??



                        Again, thank you so very much.
                        Last edited by John Kugler; 01-31-2007, 01:50 PM.

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                        • #13
                          Originally posted by John Kugler View Post
                          Mr. Hilton, as a regular of this forum, I very much look forward to your wit and wisdom on a daily basis. Your knowledge of CMMs and CMM capabiltiy is second to none, and I thank you for your dedication to this industry.
                          Geez, ya don't need to kiss him rump THAT hard, man, it's giving it away to everyone!

                          I just stayed away from this in the beginning because Hilton DOES have all the answers in this area, I just waited for him to answer. BUT, your blatant rump-kissing just FORCED me to add my comment.

                          Thank you, and have a GREAT DAY!
                          sigpic
                          Originally posted by AndersI
                          I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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                          • #14
                            Originally posted by Matthew D. Hoedeman View Post
                            Geez, ya don't need to kiss him rump THAT hard, man, it's giving it away to everyone!

                            I just stayed away from this in the beginning because Hilton DOES have all the answers in this area, I just waited for him to answer. BUT, your blatant rump-kissing just FORCED me to add my comment.

                            Thank you, and have a GREAT DAY!
                            Matt......please take your meds.........you need them......really

                            Seriously, YOU have probably contributed more than any other single person to the success of this forum. I ALWAYS read your posts.

                            Thanks for all you do for the rest of us....

                            H
                            Hilton Roberts

                            "Carpe Cerveza"

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                            • #15
                              I too would be interested.
                              Last edited by #2#; 01-31-2007, 02:16 PM.

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