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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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  • Another way to "increase trust" is to correlate your CMM programs to your previously established inspection techniques.

    Due to the level of our work, I had to create a documented procedure for this. We call it our "CMM Program Correlation Procedure".

    If you want, PM me your email & I'll send you the form we use.

    Our process:
    -I receive request for CMM program
    -CMM program gets made. Is saved in a "WORKING DIRECTORY" (Only I have access to this folder)
    -I run CMM program in real life & collect the data on all required dims
    -I measure the part with hand tools and collect the data on all of those same dims
    -Input dim data into the worksheet. The sheet compares the CMM results vs the hand tool results..it also compares that dimensional data against the allowable tolerance zone for each dim..once its done thinking about alllll that stuff it spits out a PERCENTAGE score for that row. Score less than or equal to 10% is acceptable. Score greater than 10% while still less than 25% you must "explain". Score greater than or equal to 25% is unacceptable.
    -If the worksheet is acceptable, we keep it on file as objective evidence that the program is accurate. CMM program itself now gets moved to a "VALIDATED PROGRAM DIRECTORY" folder (we only use programs from this folder to measure products).
    -Inspection paperwork gets updated to allow for the inspector to now use CMM PRG# XXXXX AS WELL AS the hand tools that their inspection sheet originally called out for. This does not remove a "micrometer" from the paperwork....this adds a "/CMM" to the paperwork to give them another option.

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  • Another way to "increase trust" is to correlate your CMM programs to your previously established inspection techniques.

    Due to the level of our work, I had to create a documented procedure for this. We call it our "CMM Program Correlation Procedure".

    If you want, PM me your email & I'll send you the form we use.

    Our process:
    -I receive request for CMM program
    -CMM program gets made. Is saved in a "WORKING DIRECTORY" (Only I have access to this folder)
    -I run CMM program in real life & collect the data on all required dims
    -I measure the part with hand tools and collect the data on all of those same dims
    -Input dim data into the worksheet. The sheet compares the CMM results vs the hand tool results..it also compares that dimensional data against the allowable tolerance zone for each dim..once its done thinking about alllll that stuff it spits out a PERCENTAGE score for that row. Score less than or equal to 10% is acceptable. Score greater than 10% while still less than 25% you must "explain". Score greater than or equal to 25% is unacceptable.
    -If the worksheet is acceptable, we keep it on file as objective evidence that the program is accurate. CMM program itself now gets moved to a "VALIDATED PROGRAM DIRECTORY" folder (we only use programs from this folder to measure products).
    -Inspection paperwork gets updated to allow for the inspector to now use CMM PRG# XXXXX AS WELL AS the hand tools that their inspection sheet originally called out for. This does not remove a "micrometer" from the paperwork....this adds a "/CMM" to the paperwork to give them another option.

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