Machine Accuracy - ??

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  • Machine Accuracy - ??

    Anybody have a tried and true (and quick and dirty) method of checking the accuracy of a machine?

    A little background: There is some "disagreement" here about our Mitutoyo CMM. Some here think it's the greatest thing since sliced bread and the machine is SOOOO accurate, and can do no wrong. I think it's one big pile of crap and I'd give someone 10 bucks to take it off my hands. Now I am the one who does all the programming, and uses it all the time. It is a "Gantry" type and I'm sure it was great in it's day. But it has seen better days, time has moved on, and has not been nice to this machine. Mitutoyo does not carry some replacement parts for this machine, what they do have costs an arm and a leg.

    Long story, short. I'm looking to have some quick and dirty way to check the accuracy of the machine. If anything, to maybe put my mind at ease to realize that it is still a good machine.

    Never mind....in typing all this, I thought of something. I will, however, take any and all advice.

  • #2
    Quick and dirty... measure some known values, ring gages, gage blocks, etc.

    Of course a machine is only as accurate as the program it is running.

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    • #3
      Do you have 3 face square with 3 holes in it. Or something else you could check using that PMM_C-1000 then check it on your Mitutoyo. I know it should be the other way around because that Mitutoyo is the greatest thing since sliced bread (If there is no static charge around).

      Or run the same GR&R test on each machine.

      Just some ideas

      BS

      BS
      Windows 7
      Pc-Dmis 2015
      Global Performance 7-10-7


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      • #4
        Oh sure, bring up the static issue. Have a nice new ground wire installed, but maintainence hasn't hooked it up to the machine yet.

        And as of today, there are 18 lightbulbs out in here, request to get them fixed is 2 months overdue.....

        "Or something else you could check using that PMM_C-1000 then check it on your Mitutoyo. I know it should be the other way around because that Mitutoyo is the greatest thing since sliced bread (If there is no static charge around). " - BSchwark

        Yeah, that's what I thought about as I wrote the original post. Thanks.

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        • #5
          I can't speak for the Gantry style, but I have used a bridge style Mitutoyo CMM that was quite accurate. It was an older machine, but very solid and well made. Of course care and use/abuse will factor heavily. Many of the older CMMs were built to be mechanically as accurate as possible because there was little to no error mapping ability. Now they are almost all built "close enough" to accurate to be error mapped "in"!!! Just wanted to point out that brand and age are not always the key factors.
          Last edited by Wes Cisco; 07-06-2006, 06:20 PM.
          sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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          • #6
            Originally posted by Wes Cisco
            I can't speak for the Gantry style, but I have used a bridge style Mitutoyo CMM that was quite accurate. I was an older machine, but very solid and well made. Of course care and use/abuse will factor heavily. Many of the older CMMs were built to be mechanically as accurate as possible because there was little to no error mapping ability. Now they are almost all built "close enough" to accurate to be error mapped "in"!!! Just wanted to point out that brand and age are not always the key factors.
            So what you are saying is you're a younger machine now, I never did think you were humum, not enough grammar mistakes.


            About the thread, take some distance reading on job blocks, make a plane and do some 3d distances
            sigpicSummer Time. Gotta Love it!

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            • #7
              'tis real good that MR. Grammar Polieman ain't around to bust us all....

              Paul, you takin' Daddy's place????
              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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              • #8
                Originally posted by dwade
                'tis real good that MR. Grammar Polieman ain't around to bust us all....

                Paul, you takin' Daddy's place????
                Oh -****- no. Wes is a deputy, and I just wanted to spank him.
                What will Daddy think of his boy when he comes back
                sigpicSummer Time. Gotta Love it!

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                • #9
                  If I had to be busted with such an error, I cannot think of a more fitting person to perform the job than the Demi-Guru-Hoe! I hang my head in shame.
                  sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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                  • #10
                    Originally posted by Paul Sarrach
                    Oh -****- no. Wes is a deputy, and I just wanted to spank him.
                    What will Daddy think of his boy when he comes back
                    Hey, now wait a cotton pickin' minute here. Public humiliation and chastisment is one thing, but "spanking" is something else entirely! I think you better go see Kev, or Craig, or that once upon a time and never again Cannuck! ROTFLMBFAOUPGAC. HeeHeeHeeHee.
                    sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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                    • #11
                      Originally posted by Wes Cisco
                      If I had to be busted with such an error, I cannot think of a more fitting person to perform the job than the Demi-Guru-Hoe! I hang my head in shame.

                      Its cool Wes. It did feel good busting one of the top dawgs. I may not be able to find fault in my self, but I sure can spot it in everyone else
                      sigpicSummer Time. Gotta Love it!

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                      • #12
                        Rolling on floor laughing my big fat *** off until Paul gets a clue.

                        Took about a minute to figure that one out. Let Paul spank himself!
                        When in doubt, post code. A second set of eyes might see something you missed.
                        sigpic

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                        • #13
                          Hey, I think this thread was hijacked!!
                          sigpic

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                          • #14
                            Originally posted by John Kingston
                            Rolling on floor laughing my big fat *** off until Paul gets a clue.

                            Took about a minute to figure that one out. Let Paul spank himself!
                            John, I think I like yours better than what I had in mind when I typed that. (. . .until people gather around concerned)

                            Rebeldude, you should know that neither myself, Paul, nor John (who doesn't want to be Canadian), would ever participate in anything as morally questionable as the highjacking of a thread ! ! ! And Paul if you are tempted to follow John's statement, remember the kittens!
                            sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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                            • #15
                              Did someone say spanking?
                              http://i58.photobucket.com/albums/g2...entinekiss.gif
                              <internet bumper sticker goes here>

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