Sketch Offset Not Closing Loop

[OneOffDesign]

I'm trying to offset the outer perimeter of a face for an extruded cut. After completion it appears all is well, but there are a few tiny gaps in the sketch that prevent it from being a closed loop and allowing the extruded cut. Manually going to each small gap and closing them will not have the surfacing quality that I need, since there is curvature involved.

I have tried projecting the outer perimeter of the surface as a sketch and then offsetting that sketch, but the same issue occurs.

Is this a known issue?

[Anonymous]

I've been having similar issues. I'm curious to see what other folks say.

[paul.clauss]

Hi @OneOffDesign, @Anonymous

Thanks for posting! I had a look and there was an issue in which profiles with more than one offset spline would not be closed, logged as FUS-25947. 

Would either of you mind sharing a file in which you have observed this behavior? This will help us look further into this issue!

To share a Fusion 360 design, please refer to the instructions at this link. You could also create a screencast showing the behavior you are experiencing!

I did note that a workaround for this issue was found by our development team. The workaround will close the offset sketch profile after the open chain is selected and moved. The profile will remain closed after it is moved back to its original position. Please see THIS SCREENCAST for an illustration of this technique.

Please let me know if you have any questions - I'm happy to help!

[HughesTooling]

Is that on an imported part? If it's imported did you use stitch and what tolerance?

Mark

[paul.clauss · Accepted solution]

Hi @OneOffDesign

Thanks for the screencast! I wanted to see if you are able to get the loop in your screencast to close by following the sequence of moves commands shown in THIS SCREENCAST. Please try doing so and let me know if it does not work for you - if you'd like to attach your file to this thread or send it to me in a private message I am happy to take a look!

If it does not work, you could try to close the offset profile by using the Sketch > Extend command in areas with a small gap. 

[OneOffDesign]

No, I built this model from scratch in Fusion 360. I've found a workaround by manually creating the sketch. I'm pretty sure this is a glitch.

[paul.clauss]

Hi @OneOffDesign

Thanks for the update - I'm glad you found a workaround. This is a bug, logged as FUS-25947 with our development team. We will be looking into this and I will provide an update here when I have more information to share.

[OneOffDesign]

Your first suggestion of extending the sketch lines gave me errors. But the second suggestion worked! I deleted the offset relationship and then attempted to move the sketch. The sketch did not actually move for some reason, but the loop closed after the attempt and I was able to make an extruded cut.

Is this a temporary workaround for now?

Thanks!

[paul.clauss]

Hi @OneOffDesign

Yes, that will be the workaround for now. I will, however, circle back here to provide an update after development addresses and resolves this issue.

Thanks!

[OneOffDesign]

Great, thank you all for the help!

[Anonymous]

This error still occurs, the workaround solved it. I would expect this issue to be resolved by now

[carriemerriam]

This is still a problem and the workaround doesn't work quite right for me - would really like to know when this. might be resolved. 

[idefaye6M2Y5]

We are in 2025 and this is still a problem to this day. The line points show not gap, but the point is white and not black, meaning the line is not closed.