Cross-sketch constraints "failed to regenerate"

martin_meinke · February 6

Hi everyone!

I am pretty new to onshape and really like it so far!
Still, right now I am struggling with what feels like a trivial problem - introducing a constraint "between sketches".
I have tried to make this work for an hour, but just can not figure out what might be the problem.

I'd highly appreciate if someone could have a quick look:
https://cad.onshape.com/documents/c4d93042f556b439a8561fbf/w/a1dadf21232ad4bb82d6a260/e/a2ea35d7bbaa35b166155245

NeilCooke · February 6

Because the feature list is regenerated top to bottom like a recipe and Sketch 2 did not exist when Sketch 1 was created. Or in other words, you can't alter the past.

glen_dewsbury · February 6

The rectangle in sketch 2 is over constrained. Because the rectangle is tied to all 4 corners of previous part a dimension is too much. Check show constraints to see.

Image: https://us.v-cdn.net/5022071/uploads/editor/6j/x6ryt756ztu1.png

martin_meinke · February 6

Thank you for your response @glen_dewsbury!
Let me try to be more precise:
Why does onshape not increase the width of the rectangle in Sketch1 to accommodate the width constraint in Sketch2? This should be possible without violating any constraints?

NeilCooke · February 6

Because the feature list is regenerated top to bottom like a recipe and Sketch 2 did not exist when Sketch 1 was created. Or in other words, you can't alter the past.

martin_meinke · February 6

That's the piece that was conceptually missing to me - thanks!

dirk_van_der_vaart · February 7

This will be usefull for you
https://cad.onshape.com/help/Content/sketch-tools-use.htm?Highlight=Use

Cross-sketch constraints "failed to regenerate"

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