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One point Alignment using CAD

Virgil UK
Just recently I have been running larger samples of parts. The time has come for me to automate my program even more. One way of doing this is a "one-point" alignment on the part. I have tried this before but have fallen foul, I think it was because I wanted to keep the CAD datum where it was. Does anybody have any info on this or can suggest some options for me achieving this?

Many thanks in advance.
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  • Thanks Matthew, I think I follow.
    Sort of how I used to do it in the old days! My problem will be that I have very little square or flat features. I'm measuring twin NGV's, I will have to calculate how to get back to point, Y, (intersection of datums), from my first point and secondary alignments.

    The example of the fixture base IS just one example.

    Another "good" read point location is "Place probe in the center of hole <thishole>". As long as you know the operator can get the probe close to a specific point-in-space to the part, you can use that point-in-space as the read point. Set up is the biggest worry when using read points for initial alignment which is why you need to 'start small' then go big. When using a hole, I would add yet another alignment, that being JUST the hole, using 3 surface sample hits, then setting origin to that feature, then expanding out.
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  • Thanks Matthew, I think I follow.
    Sort of how I used to do it in the old days! My problem will be that I have very little square or flat features. I'm measuring twin NGV's, I will have to calculate how to get back to point, Y, (intersection of datums), from my first point and secondary alignments.

    The example of the fixture base IS just one example.

    Another "good" read point location is "Place probe in the center of hole <thishole>". As long as you know the operator can get the probe close to a specific point-in-space to the part, you can use that point-in-space as the read point. Set up is the biggest worry when using read points for initial alignment which is why you need to 'start small' then go big. When using a hole, I would add yet another alignment, that being JUST the hole, using 3 surface sample hits, then setting origin to that feature, then expanding out.
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