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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
  • First off, HOW RUDE!!!!!!

    I do not necessarily want my Datums to be Zero, (don't believe I ever said that) but I do need my dimensions to come from the Datums, not the CAD trihedron. What part of this am I not explaining well enough for you to understand. If we were talking real world inspection, not with PC-DMIS, if I set Datum "A" down on a datum feature simulator it would set on the three highest points. What I did is found the three highest points on datum "A" and created a plane out of those three points?


    Call it rude, call it whatever you want.

    You've been given ALL the (correct) answers, if you can't make heads or tails of it, then "chatting" on the webs won't solve it, you need classroom training.

    If you are aligned to the "A" datum (321 or iterative), any dimension created after the alignment can ONLY come from tha datum, as that is what you have set as "master" (not ZERO, but "zero deviation from nominal").

    Aligned to datums, ANY and ALL dimensions COME FROM the datums.
Reply
  • First off, HOW RUDE!!!!!!

    I do not necessarily want my Datums to be Zero, (don't believe I ever said that) but I do need my dimensions to come from the Datums, not the CAD trihedron. What part of this am I not explaining well enough for you to understand. If we were talking real world inspection, not with PC-DMIS, if I set Datum "A" down on a datum feature simulator it would set on the three highest points. What I did is found the three highest points on datum "A" and created a plane out of those three points?


    Call it rude, call it whatever you want.

    You've been given ALL the (correct) answers, if you can't make heads or tails of it, then "chatting" on the webs won't solve it, you need classroom training.

    If you are aligned to the "A" datum (321 or iterative), any dimension created after the alignment can ONLY come from tha datum, as that is what you have set as "master" (not ZERO, but "zero deviation from nominal").

    Aligned to datums, ANY and ALL dimensions COME FROM the datums.
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