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When I have a CAD model, the way I usually do the alignment is this:
Import
Do a manual iterative to 6-7 points, OR a combination of other features.
Then do a dcc iterative, using more points/hits on the same features.
Next, in order to make the trihedron shift to the orientation and location that matches the print (the CAD origin is rarely where the print origin is), I create the per-print datum structure, using planes, or lines or cylinders (as required for each part) measuring these features. I then do a non-iterative alignment to those measured features.
Example:
1. Select Dat_A (a measured plane) and then LEVEL TO Z plus.
2. Select Dat_B (another measured plane) and ROTATE TO X minus.
3. Select XYZ ( a point constructed from the corner of planes Dat_A, Dat_B and Dat_C) and origin to X and Y
4. Select Dat_A and origin to Z.
5. Create
Never in this process do I click CAD=PART (cuz the iterative usually takes care of that).
My question is, should I do this (create this ABC alignment after a DCC iter)? Is this messing around with what the dcc iterative alignment achieved?
I sometimes get weird results on parts... Results that I cannot confirm with a surface plate and a height gage. Just thinking that my approach may be faulty, adding an additional 'ABC' alignment after a dcc iterative.
Import
Do a manual iterative to 6-7 points, OR a combination of other features.
Then do a dcc iterative, using more points/hits on the same features.
Next, in order to make the trihedron shift to the orientation and location that matches the print (the CAD origin is rarely where the print origin is), I create the per-print datum structure, using planes, or lines or cylinders (as required for each part) measuring these features. I then do a non-iterative alignment to those measured features.
Example:
1. Select Dat_A (a measured plane) and then LEVEL TO Z plus.
2. Select Dat_B (another measured plane) and ROTATE TO X minus.
3. Select XYZ ( a point constructed from the corner of planes Dat_A, Dat_B and Dat_C) and origin to X and Y
4. Select Dat_A and origin to Z.
5. Create
Never in this process do I click CAD=PART (cuz the iterative usually takes care of that).
My question is, should I do this (create this ABC alignment after a DCC iter)? Is this messing around with what the dcc iterative alignment achieved?
I sometimes get weird results on parts... Results that I cannot confirm with a surface plate and a height gage. Just thinking that my approach may be faulty, adding an additional 'ABC' alignment after a dcc iterative.
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