topic Help with fully constraining sketch in Fusion Support Forum

Help with fully constraining sketch

fahey32 — Thu, 19 Jun 2025 21:00:15 GMT

I've been agonising over this sketch for a few weeks now. There seems to be a conflicting contraint that wont allow me to contrain the construction symmetry line to the z axis, which would in turn would allow me to fully constrain the sketch. the issue seems to lie around the two circular race track profiles about the middle. I've played with the constraints and dimesnions relating to these features and have not been able to find the offending issue. If I fix the top line and its end points, most of the sketch goes black except for those circular tracks and 4 horizontal lines near the center for some reason (see pic).

I also tried using the move command which deletes all of the symmetry constraints, which I don't want to do. It would be nice if fusion could list and filter constraints like other CAD packages. I've attached a copy of the sketch. Could someone smarter (and likely more handsome) be willing to cast an eye over it and identify the culprit. thanks in advance

Re: Help with fully constraining sketch

TheCADWhisperer — Thu, 19 Jun 2025 21:18:51 GMT

@fahey32

If this were my sketch - I would not duplicate symmetrical geometry.

Symmetry constraints are not needed.

Making use of Thin Feature Extrusions - most of it could probably be single line.

Those three tips would eliminate most of the complexity and significantly reduce both your workload and the sketch solver workload.

I recommend starting over from scratch and ask questions early and often.

Re: Help with fully constraining sketch

TheCADWhisperer — Thu, 19 Jun 2025 21:24:33 GMT

@fahey32

Is this what you intended in this area?

Have you used single line Thin Feature Extrusions before?

Another strategy would be to do this as 2 or 3 sketches rather than one massively complicated sketch.