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Alignment Features and Location vs Position

MaLux
hello,

simple basics but i am not sure.

the ISO drawing callout's for GX circles, so i wrote the program only using GX circles... If i am not wrong the xact measure position calculation is also automatically using GX, even If the element is measured as GG ?!

Is this the right way, or should the alignment be GG to be more stable and measure the Elements a second time with GX, since our PC-DMIS 2017 and Q-DAS Converter can't output the Dimension when using Size for GX...

What i also can't figure out is, that the X,Y Location even with measured GX Features and alignment are not matching the XAct Location... ConfusedConfused

Perp. to centerline and the axis are checked so what could cause the deviation between the Position and Coordinates ?


Thanks in advance.
Parents
  • Creating a plane from vector points and use "auto"-settings will result in a best-fit gaussian plane, right ?
    for flatness this will be re-calculated to chebyshev (min/max) ?!

    Will XactMeasure re-calculate the plane, if used as Datum A, if not.. how should the plane be constructed ?
    Is it necessary to construct a "primary datum plane" or "Bestfit - min_sep" and use this for dimensioning ? ( i don´t know, if this options are available in R2017.1 , i just read it in the help file)


    As for alignments, GX (maximum inscribed) is known to be mathematically unstable in certain cases and can lead to poor repeatability
    Would you recommend to measure GG and GX, then use the GG-Alignment for the probing part for repeatability and GX-Alignment for the dimensioning ?


    Thanks.
Reply
  • Creating a plane from vector points and use "auto"-settings will result in a best-fit gaussian plane, right ?
    for flatness this will be re-calculated to chebyshev (min/max) ?!

    Will XactMeasure re-calculate the plane, if used as Datum A, if not.. how should the plane be constructed ?
    Is it necessary to construct a "primary datum plane" or "Bestfit - min_sep" and use this for dimensioning ? ( i don´t know, if this options are available in R2017.1 , i just read it in the help file)


    As for alignments, GX (maximum inscribed) is known to be mathematically unstable in certain cases and can lead to poor repeatability
    Would you recommend to measure GG and GX, then use the GG-Alignment for the probing part for repeatability and GX-Alignment for the dimensioning ?


    Thanks.
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