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Align differently shaped parts to center

Question asked by Mark Sully on Mar 26, 2009
Latest reply on Mar 27, 2009 by Bruce Fisher

I have a question regarding aligning differently shaped parts.
I can't share the models for confidentiality reasons but imagine I have 2 parts:
Part A is shaped like the number 8 with the origin at the center of the lower circle.
Part B is a simple rectangular shape with the origin in one of the corners.
Part B could be either smaller, exactly the same size or bigger than Part A.

What I want to do is align Part B over Part A so that whatever size it is the gap between any of the edges is the same.
Also I want to be able to change the size of Part B and have the central relationship update (at the moment if I change the size of Part B then the 'extra' is all on 1 side of my assembly, it's not distributed equally).

I hope that makes sense, thanks in advance.