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Wire surface profile call out confusion.

RobOntario
Hello all

I have a surface profile call out for 3 mm, the program uses 1.5 -1.5 and deviation 3.0 to check all those hits. My question is whether unilateral profile should be only about max min deviation about 3 mm?
Can I use 3 mm and -3 mm to check the hits M value and relays on deviation only?

Thank you



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  • This is a link to a handout that you can download explaining how profile is reported when using Legacy dimensioning, XactMeasure or Geometric tolerance commands. Only Geomoetric tolerance commands report in accordance with ASME Y14.5 2018 (using the single value method detailed in Y14.5.1 2019). Legacy & Xactmeasure use the older, two value method and require you to compare bot the max AND the min against the upper and lower tolerance limits to prove conformance.

    https://support.hexagonmi.com/s/article/Geometric-Tolerance-GD-T-handout-for-PC-DMIS-2020R2-version

    As for your question about the amount of ± to apply - a profile tolerance of 3 means ±1.5 from the nominal surface so MAX can not exceed +1.5 and MIN can not exceed -1.5.
    In answer to your other question
    Using the attached as an example: MAX 0.821 MIN -0.685, no MEAS DEV 1.506X2=3.012, but it showed failure? Correct?
    No. For the single value method, the largest amount of deviation from nominal is +0.821, 0.821*2 = 1.642 which is less than 3 and therefore, within tolerance.
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  • This is a link to a handout that you can download explaining how profile is reported when using Legacy dimensioning, XactMeasure or Geometric tolerance commands. Only Geomoetric tolerance commands report in accordance with ASME Y14.5 2018 (using the single value method detailed in Y14.5.1 2019). Legacy & Xactmeasure use the older, two value method and require you to compare bot the max AND the min against the upper and lower tolerance limits to prove conformance.

    https://support.hexagonmi.com/s/article/Geometric-Tolerance-GD-T-handout-for-PC-DMIS-2020R2-version

    As for your question about the amount of ± to apply - a profile tolerance of 3 means ±1.5 from the nominal surface so MAX can not exceed +1.5 and MIN can not exceed -1.5.
    In answer to your other question
    Using the attached as an example: MAX 0.821 MIN -0.685, no MEAS DEV 1.506X2=3.012, but it showed failure? Correct?
    No. For the single value method, the largest amount of deviation from nominal is +0.821, 0.821*2 = 1.642 which is less than 3 and therefore, within tolerance.
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