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calibration issue ?

francisco_cmm
Hello all!

I just really confused my self here. I heard someone last week saying the my CMM calibration ( Global Image) calibrates in Microns.? I always though it was on the tents. I'm inspecting parts that are .0004 tents on profile, I get results of .0009 tents.
now going back to my calibration results are .0004 tents. could this tents be issue on why my profile is coming out bad? I also get the same results when I do total runout.

UPDATE: CALIBRATION WAS DONE IN INCHES THEN I RAN THIS PROGRAM ON MM
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  • When Hexagon calibrates your machine, the reports are in microns. When you qualify your probes, the results are in the unit you chose when you created the program.
    Also, if you have 0.0004" standard deviation on your results, I would not trust the data that you get on a 0.0004" profile call-out. I would clean the sphere and the ruby with alcohol and blow them off with compressed air before re-measuring the tip angle. If you're checking ±0.0002", you need to eliminate as many uncertainties as you possibly can. The software is going to always give you a number. The crux is knowing that you can trust that number.
    HTH
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  • When Hexagon calibrates your machine, the reports are in microns. When you qualify your probes, the results are in the unit you chose when you created the program.
    Also, if you have 0.0004" standard deviation on your results, I would not trust the data that you get on a 0.0004" profile call-out. I would clean the sphere and the ruby with alcohol and blow them off with compressed air before re-measuring the tip angle. If you're checking ±0.0002", you need to eliminate as many uncertainties as you possibly can. The software is going to always give you a number. The crux is knowing that you can trust that number.
    HTH
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