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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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  • In PC-DMIS 2018, using FCF dimensions, ASME. (Just an exaggerated example here) if deviations range from plus 11.001mm to plus 11.010mm, PC DMIS reports the profile as 11.010, rather than 22.020. That's wrong, and always was wrong.

    In the case of that particular software version, switching to ISO, reported values are now 22.020. That's right, and always was right. (edited for typos)

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  • in reply to Kai Kendall
    To anybody who understands a bilateral profile tolerance zone, the explanation should be quite simple. The software change was primarily to support an updated GD&T library that focuses heavily on compliance to the governing standard. PC-DMIS was correct to the initial version of Y14.5.1 by reporting the min and max profile deviation. When that standard was updated in 2019 to provide a single actual value definition for profile of a surface (and eliminate many ambiguities), the software was updated to support it. Also, the GD&T library was overhauled to replace XactMeasure, which was initially designed for relatively simple applications of GD&T. Once faced with more complex designs, XactMeasure didn't always hold it's end of the bargain.
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  • in reply to Kai Kendall
    To anybody who understands a bilateral profile tolerance zone, the explanation should be quite simple. The software change was primarily to support an updated GD&T library that focuses heavily on compliance to the governing standard. PC-DMIS was correct to the initial version of Y14.5.1 by reporting the min and max profile deviation. When that standard was updated in 2019 to provide a single actual value definition for profile of a surface (and eliminate many ambiguities), the software was updated to support it. Also, the GD&T library was overhauled to replace XactMeasure, which was initially designed for relatively simple applications of GD&T. Once faced with more complex designs, XactMeasure didn't always hold it's end of the bargain.
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