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Iterative alignment and using XactMeasure

Alright here is my problem/question.
I have a part where Datum -A- (Z axis) is not prismatic, however datum -B- (X axis) and -C- (Y axis) are.

I do not have much experience with Iterative alignments other than that I have been to the Level 2 Hexagon class (Just don't use them or have the need too).

My thoughts were, this is a good time, to try an Iterative alignment.
I believe I have that part of the program correct:
I created 6 auto vector points on top (Datum -A-),
then 5 auto vector points on left side (Datum -B-)
then finally 5 auto vector points on the front of the part (Datum -C-).

When I create the Iterative alignment I pick top 6 points as level (Datum -A-),
5 points on left rotate (Datum -B-),
then 5 points on front as origin (Datum -C-).

After completing this Iterative alignment my trihedron doesn't move from before the alignment.
So I constructed planes out of the five points for datum -B- and -C- respectively.
I then origin my "X" to Datum -B- and my "Y" to datum -C-.
How do I origin my "Z", and how do I assign my datum -A- for exact measure? Where did I go wrong? Please any help would be greatly appreciated.
Parents

  • On BWIZZLE's part, there is no way to Level to the irregular A datum. There's also no way to define it as a single 3D feature (plane or cylinder) that could be used for leveling by an Xactmeasure internal calculation. Therefore, the best way is (as I explained above) a good Iterative - which has been written - and some good Legacy position dimensions.

    /THREAD


    I'm looking for a way to get my nominals to come from the datums, not from my trihedron. Iterative alignment will align to trihedron not the datums. I guess my problem is making Datum "A" an origin more than the Iterative alignment. The Iterative alignment part of the problem is just what I thought would fix the problem, and apparently it will not. All of the information on Iterative alignments is great, but is not the answer I'm looking for. I guess all I really want to know is how do you origin on an irregular CAD surface?

    Iterative alignments are great for measuring parts in aircraft/car body coordinates, but that seems to be about it. When you need your report to measure from the datums and not the trihedron, its not effective alone.
Reply

  • On BWIZZLE's part, there is no way to Level to the irregular A datum. There's also no way to define it as a single 3D feature (plane or cylinder) that could be used for leveling by an Xactmeasure internal calculation. Therefore, the best way is (as I explained above) a good Iterative - which has been written - and some good Legacy position dimensions.

    /THREAD


    I'm looking for a way to get my nominals to come from the datums, not from my trihedron. Iterative alignment will align to trihedron not the datums. I guess my problem is making Datum "A" an origin more than the Iterative alignment. The Iterative alignment part of the problem is just what I thought would fix the problem, and apparently it will not. All of the information on Iterative alignments is great, but is not the answer I'm looking for. I guess all I really want to know is how do you origin on an irregular CAD surface?

    Iterative alignments are great for measuring parts in aircraft/car body coordinates, but that seems to be about it. When you need your report to measure from the datums and not the trihedron, its not effective alone.
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