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Alignment Question. BF Line between Holes vs Autoalign Cylinders

Lukas
Hello. I am programming a part using legacy. The top plane is the primary datum and the seconary/tertiary datums are two thru holes that are square to the top plane. So rotate to the line between the holes of course.

I have profile of a surface called out to these datums.

I tried two alignments:

- One alignment uses cylinders. I autoaligned to the top plane and the 2 cylinders.

- The other alignment I created a 2d best fit line between the cylinders. I autoaligned to the top plane, the best fit line, and one cylinder as my tertiary datum.

My profile of a surface looks crooked when I use the first alignment, and it looks much better using the second alignment. Can someone explain why my results would be different? Should I go with alignment #2? Please see screenshots.
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  • So weird. I did some quick tests in the software.

    I created pierce points where the cylinders meet the primary datum plane (top plane).

    If I autoalign rotate to those points:again, bad results. If I create a line between the points and rotate to that line: good results.

    At this point I really have to stay away from autoalign...I don't get how it's making the calculation whatsoever.
  • in reply to Lukas
    i don't think you guys are using autoalign correctly. autoalign assumes you are selecting your datums in a correct order. if you don't will get different results becaause the alignments arent the same.
    did you try this exact same test without using auto align? what were your results?
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