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CMM Health

acgarcia
Good Afternoon Everyone,

We are starting a CMM health initiative to help trust the CMMs. As of right now, operators can only run parts and the probe calibration program. Management is looking into something like check an artifact of known size weekly or even daily. I have (4) 454 SFs with (3) with manual heads and (1) with an indexing head, (3) Tigos with fixed analog heads, and (1) 7.10.7 Sf with an indexing head.

What kind of artifacts do you all check on a regular basis for CMM confidence? Rings gages? Gage blocks? An actual machine'd part? If its a machine'd part, do you check on 1 CMM to compare to other CMMs? OR does the human check it with hand tools and then looks for correlation? I know Hexagon has the swift check thing but I think its only for indexing heads so it won't work with all my CMMs.

Any advice? Thanks.
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  • I do my own ball-bar checks as well as linear checks with a home-made step bar (that was measured and assigned 'nominals' based on a brand new CMM machine machine installed and calibrated and certified by the OEM). Step Bar has no 'certification' that is traceable, however it gets checked right after the annual calibration of the machine, data saved, and used for comparison until the next machine calibration.

    your step bar can be traceable, since you measured it with a calibrated CMM that is traceable to NIST.

    i would measure the step bar and note of the report and serial number of CMM used and calibration status of CMM and then assign a serial number to your homemade step bar.
    bam you have a certified step bar.

    Todo this you should create a procedure of how you're measuring the step bar on the cmm,
    on your report make sure to reference CMM Serial#, Step Bar serial number, procedure used, calibration due date of CMM.
    fill out your calibration record/certificate and include the CMM report. now you have a in house calibrated step bar traceable to NIST or whatever you CMM is traceable to.

    If you get audited about the validity of your step bar, you can show them the results from the cmm and then show them the calibration certificate for the CMM, you shouldn't have any more questions after that.

    I do this all the time in my shop and been audited and haven't had a problem yet, just got to create the right paperwork trail.

    i believe you've got a calibrated step bar missing some paperwork.

    just my .02 cents

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  • I do my own ball-bar checks as well as linear checks with a home-made step bar (that was measured and assigned 'nominals' based on a brand new CMM machine machine installed and calibrated and certified by the OEM). Step Bar has no 'certification' that is traceable, however it gets checked right after the annual calibration of the machine, data saved, and used for comparison until the next machine calibration.

    your step bar can be traceable, since you measured it with a calibrated CMM that is traceable to NIST.

    i would measure the step bar and note of the report and serial number of CMM used and calibration status of CMM and then assign a serial number to your homemade step bar.
    bam you have a certified step bar.

    Todo this you should create a procedure of how you're measuring the step bar on the cmm,
    on your report make sure to reference CMM Serial#, Step Bar serial number, procedure used, calibration due date of CMM.
    fill out your calibration record/certificate and include the CMM report. now you have a in house calibrated step bar traceable to NIST or whatever you CMM is traceable to.

    If you get audited about the validity of your step bar, you can show them the results from the cmm and then show them the calibration certificate for the CMM, you shouldn't have any more questions after that.

    I do this all the time in my shop and been audited and haven't had a problem yet, just got to create the right paperwork trail.

    i believe you've got a calibrated step bar missing some paperwork.

    just my .02 cents

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