Iterative alignments (again)

Hello all,

Been reading a lot of posts on iterative alignments which seem to cause some confusion, but once cracked have shown good, repeatable and reproducible results for me!
Alas, moved on the next part number of blade, and no matter what I do I get the ever so helpful “iterative alignment error” message!
This second batch of blades has a much steeper blade angle, so I am thinking the sets of datum points are not 90degrees to another, however these are taken from the CAD model! To confirm my theory if I tweak the vectors it runs, but now I’m not approaching the points correctly?
Anyone ever come across this?
Thanks I’m advanced!

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Neil Challinor over 1 year ago
I'm guessing it's because the vectors from points taken on a blade would probably violate the iterative alignment rules: https://docs.hexagonmi.com/pcdmis/2023.1/en/helpcenter/index.htm?rhcsh=1&rhnewwnd=0#t=mergedProjects%2Fcore%2F18_alignment_topics%2FIterative_Alignment_Rules.htm

The normal vectors for the first set of elements must be approximately parallel.

The features in the ROTATE set must have normal vectors that are approximately perpendicular to the vectors of the features in the LEVEL set.

The features in the ORIGIN set must have a normal vector that is approximately perpendicular to both the vectors from the LEVEL set and the ROTATE set.

For more complex parts (like blades) I've found that I usually need to code my own version of an iterative alignment using IF/GOTO commands and labels. I've attached a document that explains the process.

Attached Files

ALTERNATIVE ITTERATIVE ALIGNMENT METHOD FOR PC.pdf
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Neil Challinor over 1 year ago
I'm guessing it's because the vectors from points taken on a blade would probably violate the iterative alignment rules: https://docs.hexagonmi.com/pcdmis/2023.1/en/helpcenter/index.htm?rhcsh=1&rhnewwnd=0#t=mergedProjects%2Fcore%2F18_alignment_topics%2FIterative_Alignment_Rules.htm

The normal vectors for the first set of elements must be approximately parallel.

The features in the ROTATE set must have normal vectors that are approximately perpendicular to the vectors of the features in the LEVEL set.

The features in the ORIGIN set must have a normal vector that is approximately perpendicular to both the vectors from the LEVEL set and the ROTATE set.

For more complex parts (like blades) I've found that I usually need to code my own version of an iterative alignment using IF/GOTO commands and labels. I've attached a document that explains the process.

Attached Files

ALTERNATIVE ITTERATIVE ALIGNMENT METHOD FOR PC.pdf
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RobOntario over 1 year ago in reply to Neil Challinor

I like this method. A real example might be more understandable .
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