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Readpoints and Alignments..Legacy/Xact

The Rook
I have a few questions and concerns I was hoping could get addressed. So thank you for your insight in advance.

A coworker and I were having a discussion about using the readpoint alignment to inspect a whole part. I said that is not good practice.

Anyway, he did so and inspected a part using just the readpoint. Numbers were coming out ok...so I was a bit confused.

Can you use the readpoint to inspect the whole part? He also said that you dont need to align to datums. That you can pick them up as normal features then when dimensioning something like true position you can just select those features.

This has really thrown me for a loop. This isn't really good practice...right? Shouldnt a basic alignment of the part be conducted after the readpoint to just solidify it a bit more? Then probe the same features again with a few more hits to refine it?

Is it necessary to do this? And one more thing, I've searched high...I've searched low, I still am not sure when folks talk about legacy or exactmeasure. How do I know what mode I'm in? How do I switch between?

Thanks for reading.
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  • Someone please correct me if I'm wrong, but I was under the impression that using GEOTOL indeed does allow you to select datums from a dropdown without being aligned to those exact datums. Obviously the datums have to be measured and defined beforehand, but on a part with multiple datum structures (A|B|C, G|H|F, etc.) you don't have to be aligned to each one individually before dimensioning.

    Correct. They just need to be measured and defined.
  • in reply to bfire85
    JFournier mentioned diimensioning to the datums in Geo Tol not physically probing the features in another alignment. If you are in some weird alignment when dimensioning and you select your datums and tell it to measure it via Datum Reference Frame, it will move the trihedron to that spot and change the trihedron colors. Probing the features not in the correct alignment, yes, can throw you out of whack especially relating to profile. I always try to probe in the correct alignment.
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  • in reply to bfire85
    JFournier mentioned diimensioning to the datums in Geo Tol not physically probing the features in another alignment. If you are in some weird alignment when dimensioning and you select your datums and tell it to measure it via Datum Reference Frame, it will move the trihedron to that spot and change the trihedron colors. Probing the features not in the correct alignment, yes, can throw you out of whack especially relating to profile. I always try to probe in the correct alignment.
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