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Another ASME profile question Ugh!

markoor99
I know this gives people brain aneurisms as it does for me, so I'm just asking for opinions. I've looked at numerous threads on this to the point my head is going to explode. I have a blueprint that says, "Blueprint interpretation, ASME Y14.100" in the notes. Underneath that it says, "Dimensioning and tolerancing: ASME Y14.5".

I thought in ISO you doubled the worst points deviation. But my AMSE 14.5 is doubling it in GEOTOL. What is correct these days? Double it or just min-max? By the way I
'm running 2020 R2. Was this changed in later version?

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  • I take exception to your statement that "the software outputs the wrong value".

    As I said in my previous statement, the ASME Y14.5.1 math standard defines the way in which profile is calculated. Feature control frame reporting (XactMeasure) up until 2020 R1 followed the rules and calculation method detailed in ASME Y14.5.1 - 1994 which stated that BOTH the max and min deviations must be compared to the tolerance in order to verify conformance.



    The next release of the math standard (14.5.1 - 2019) was published in early 2020. Again, as I said, the definition changed to a single value method - twice the largest deviation - and the geometric tolerance command in PC-DMIS 2020 R2 onwards supports this.

    I checked with Hexagons Dimensional Standards Compliance Manager (Robert Jensen) who is also a member of ASME and ISO and whom chairs the ASME Y14.5.1 math committee and he confirms these facts.

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  • I take exception to your statement that "the software outputs the wrong value".

    As I said in my previous statement, the ASME Y14.5.1 math standard defines the way in which profile is calculated. Feature control frame reporting (XactMeasure) up until 2020 R1 followed the rules and calculation method detailed in ASME Y14.5.1 - 1994 which stated that BOTH the max and min deviations must be compared to the tolerance in order to verify conformance.



    The next release of the math standard (14.5.1 - 2019) was published in early 2020. Again, as I said, the definition changed to a single value method - twice the largest deviation - and the geometric tolerance command in PC-DMIS 2020 R2 onwards supports this.

    I checked with Hexagons Dimensional Standards Compliance Manager (Robert Jensen) who is also a member of ASME and ISO and whom chairs the ASME Y14.5.1 math committee and he confirms these facts.

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