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Help Understand this Envelope modifier dimension

KatmandudaMeow
attached is the True Postion which makes sense.



below is the dimension in question, i understand the callout but dont understand what this is telling me?

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  • For the ISO envelope modifier – the upper value is the 2-point local size (LP) and the lower value is the Maximum Inscribed size (GX) as can be seen by comparing the two size commands below…

    DIAM_SC1 =SIZE/
    OUTPUT=BOTH, UNITS=MM, STANDARD: ISO 14405-1,
    TOLERANCE SPECIFICATION MODE: NOMINAL_WITH_DEVIATIONS,
    NOMINAL SIZE: 15.2,
    UPPER TOLERANCE: 0.05,__,
    LOWER TOLERANCE: 0.05,E,__,
    UPPER SIZE: 15.2386,
    LOWER SIZE: 15.0973,
    FEATURE: BUSH_LA


    DIAM_SC2 =SIZE/
    OUTPUT=BOTH, UNITS=MM, STANDARD: ISO 14405-1,
    TOLERANCE SPECIFICATION MODE: NOMINAL_WITH_DEVIATIONS,
    NOMINAL SIZE: 15.2,
    UPPER TOLERANCE: 0.05,LP,__,
    LOWER TOLERANCE: 0.05,GX,__,
    UPPER SIZE: 15.2386,
    LOWER SIZE: 15.0973,
    FEATURE: BUSH_LA


    This is explained on pages 14 & 15 of the ISO 14405-1:2016 standard.​
Reply
  • For the ISO envelope modifier – the upper value is the 2-point local size (LP) and the lower value is the Maximum Inscribed size (GX) as can be seen by comparing the two size commands below…

    DIAM_SC1 =SIZE/
    OUTPUT=BOTH, UNITS=MM, STANDARD: ISO 14405-1,
    TOLERANCE SPECIFICATION MODE: NOMINAL_WITH_DEVIATIONS,
    NOMINAL SIZE: 15.2,
    UPPER TOLERANCE: 0.05,__,
    LOWER TOLERANCE: 0.05,E,__,
    UPPER SIZE: 15.2386,
    LOWER SIZE: 15.0973,
    FEATURE: BUSH_LA


    DIAM_SC2 =SIZE/
    OUTPUT=BOTH, UNITS=MM, STANDARD: ISO 14405-1,
    TOLERANCE SPECIFICATION MODE: NOMINAL_WITH_DEVIATIONS,
    NOMINAL SIZE: 15.2,
    UPPER TOLERANCE: 0.05,LP,__,
    LOWER TOLERANCE: 0.05,GX,__,
    UPPER SIZE: 15.2386,
    LOWER SIZE: 15.0973,
    FEATURE: BUSH_LA


    This is explained on pages 14 & 15 of the ISO 14405-1:2016 standard.​
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