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Sketch Constraints often Breaking

CyberphilCyberphil Member Posts: 4
I've found, more and more with rather complicated sketches, that often when dimensions or sketches are deleted in a sketch, somehow the sketch becomes unsolvable. 

Example: I have a  fully defined sketch (all lines black) that I wish to edit. I delete one constraint in order to make a change I want and all the sudden the sketch turns completely red and says it's unsolvable.

A document where this is happening often with some rather complicated sketches:

https://cad.onshape.com/documents/9a55bd90131e1850420c6aab/w/144b6c1875f0d3e4c4572010/e/5b0f638f59c64f0fa4952573

This seems extremely odd to me because deleting constraints should allow more solutions to the sketch, not less. Any insight as to why this is happening?

Comments

  • matthew_stacymatthew_stacy Member Posts: 272 PRO
    @Cyberphil, perhaps you could share a document with just a single problematic sketch to illustrate the problem.  Also make a short video showing which dimension you are deleting that causes the sketch to blowup.

    Might it be possible to have a scenario where rather than being over-constrained, the sketch becomes indeterminant?  I can imagine that either case would be computationally challenging.
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