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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
  • Thank you for the thorough explanation of Iterative alignments. I think there is one misunderstanding, that is entirely my fault, because I did not explain it entirely.Slight smile My customer supplied model comes to me with the CAD origin (Trihedron) in aircraft/car body coordinates. I then transform my model in a way that it is square with my machine and the origin is now in a hole that we do a read point alignment with and run the entire part in DCC. So my question is if my trihedron is not at the A-B-C alignment, how do I report my true position, and profile dimensions to a A-B-C FCF? I do not want my report in aircraft or car body coordinates either. I want my dimensions to come from my Datums A-B-C. I think this eliminates using a Iterative alignment, because I did some tests today and the Iterative alignment will use the origin from wherever it is on the model, not necessarily from the Datums?
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  • Thank you for the thorough explanation of Iterative alignments. I think there is one misunderstanding, that is entirely my fault, because I did not explain it entirely.Slight smile My customer supplied model comes to me with the CAD origin (Trihedron) in aircraft/car body coordinates. I then transform my model in a way that it is square with my machine and the origin is now in a hole that we do a read point alignment with and run the entire part in DCC. So my question is if my trihedron is not at the A-B-C alignment, how do I report my true position, and profile dimensions to a A-B-C FCF? I do not want my report in aircraft or car body coordinates either. I want my dimensions to come from my Datums A-B-C. I think this eliminates using a Iterative alignment, because I did some tests today and the Iterative alignment will use the origin from wherever it is on the model, not necessarily from the Datums?
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