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Check out this video on Flexible Modeling from PTC Application Engineers!
Presenters: Lino Tozzi (Technical Specialist, Fellow) and Ryan Butcher (Technical Specialist, Fellow)
To dive deeper into the subject, check out PTC University.
Question from Andrew: If you have a dimension in a sketch linked to a drawing, then use flexible modeling to modify that feature, what happens to the original dimension link?
Answer: Flex Modeling features are added at the end of the model tree. All features, sketches, etc. still exist earlier in the model tree if you leave them. As Lino showed in the first example, the Flex move would be added onto the new position of the geometry.
Question from Andrew: Do you have any examples of modifying parts with draft? One case: if you extended a drafted boss, would you need to identify the walls as a "chamfer"?
Answer: No, you would just pick the entire boss with draft and rounds and they would all move together. You are only picking geometry not features.
Question from Calvin: Since this is a Creo model, why not use redefine? When shown dimensions, you get two sets of dimensions? Original constraints and the flexible dimensions?
Answer: Yes, you could easily go back to the feature tree and edit definition or even find the dim and modify. But you might not have dimensions you want to move (on an imported model or really poorly modeled model).
Question from Robert: Once you have all the rounds selected, can you send them to a group in the model tree?
Answer: To group features, they need to be in order so, yes, if they are in order but this is independent that the prior history of the model. It adds features to the bottom of the model tree.