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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
  • Both. Your dimensions will report out as X-301, Y-201, but the position will have been calculated by creating ABC at 0,0 and translating it 300,200.

    In the case of your irregular surface that is impossible to origin on, if you aren't given XYZ coordinates for say, datum B and C, then you have no way to translate the CAD. So, leave it in body position! It is ok for your nominal to not be 1,1. The calculation was done as 1,1 translated 300,200 to comply with your CAD position.


    It is NOT ok of for me to leave it in body position!
    My customer requirements are to have the dimensions report out from the Datums, not the CAD origin. My report would need to say 1 inch from "X" and 1 inch from "Y". I have no way of measuring Datum "A" to my CAD origin due to it being an irregular surface.
Reply
  • Both. Your dimensions will report out as X-301, Y-201, but the position will have been calculated by creating ABC at 0,0 and translating it 300,200.

    In the case of your irregular surface that is impossible to origin on, if you aren't given XYZ coordinates for say, datum B and C, then you have no way to translate the CAD. So, leave it in body position! It is ok for your nominal to not be 1,1. The calculation was done as 1,1 translated 300,200 to comply with your CAD position.


    It is NOT ok of for me to leave it in body position!
    My customer requirements are to have the dimensions report out from the Datums, not the CAD origin. My report would need to say 1 inch from "X" and 1 inch from "Y". I have no way of measuring Datum "A" to my CAD origin due to it being an irregular surface.
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