topic Projected geometry not updating correctly in sketch in Fusion Support Forum

Projected geometry not updating correctly in sketch

Sam_Sanford — Sat, 02 Jan 2021 03:48:06 GMT

Hello,

I'm having an interesting issue where my projected geometry doesn't update correctly. I first tested on a small scale, with a single extrusion that was the child of a previous projected sketch on a part that was the child of another part that it was projected from, and it updates correctly. So thinking that I was good to go, I went ahead and did the rest of my work and now when I update the geometry of the parent part, the child part sketch looses construction line coincident constraints with projected geometry. I didn't explain this well at all so here's a screencast:

https://autode.sk/34ZKmwM

It's a huge f3d file so I'm not sharing it unless it's deemed necessary for troubleshooting.

Am I just going about this the wrong way and that's why I am having these updating issues? Or is the general approach correct, but there is a minor misstep I am taking?

Re: Projected geometry not updating correctly in sketch

davebYYPCU — Sat, 02 Jan 2021 04:49:00 GMT

Basic problem I see is that the projected items are not purple. There is a toggle to keep link, you need that on.

Project the holes from sketch 1 to sketch 2 and then

sketch 1 to sketch 3 to eliminate the middle man.

Your sketches are too cumbersome, would need the file or that section of it, for better understanding of the context.

If you can mirror something in the sketch, don't, mirror it in the modelling area, instead.

Might help....

Re: Projected geometry not updating correctly in sketch

Sam_Sanford — Sun, 03 Jan 2021 19:54:43 GMT

UPDATE: Found a solution/workaround!

All I did was delete all mirrored sketch geometry and extruded that corner of stuff. Then in the modeling space, I mirrored the cutout features over the plane between the two middle mounting holes first and then mirrored the previous mirrored feature and the original extrusion over the YZ plane. With this method the projected geometry updated perfectly when I changed the hole spacing of the parent sketch of the parent part. Everything is nice and peachy again.

I guess I just need to steer clear of using patterns and mirrors within my sketches and instead do that stuff on the outside in the modeling world.