splines and closed loops

[Anonymous]

Greetings,

I have a spline that I have offset by 2mm. I have drawn lines to connect end of the offsets but it won't shade to indicate a closed loop. I'm trying to extrude the profile but can select the section I have drawn. Any suggestions?

Thanks

Hanswurst

[James.Youmatz]

Hi @Anonymous,

One thing you can try is breaking the link of the project lines. You can do this by right-clicking the purple lines and then selecting "Break Link". This might help you. Also, it is really hard to see what is going on from your picture. Do you think you could share the model with us? This way I can try to reproduce your steps and see what may be causing the issue.

Thanks,

[Anonymous]

I tried to break the links but couldn't find the command on right click. Here's a link to the model.

http://a360.co/1MVmRr5

thanks in advance

hanswurst

[Anonymous]

interesting. I copied the component that the sketch was a part of into a new design. it works in the new design but not the one it came from.

thanks - resolved (although I'd love to know what the reason was)

[James.Youmatz]

Hi @Anonymous,

What's even weird is when I open your model and go to click your sketch profile, it is selectable for me. Maybe it was just a glitch on your local machine! Not sure to be honest as I can't reproduce the issue. At least it works now!

Thanks,

[Oceanconcepts]

I have seen this several times in the past, always with splines, where even with coincident constraints applied such that the sketch should represent a closed profile, I can’t get one. Yet projecting the same lines to a new sketch gives a closed profile. And, as you discovered, sending the sketch to Autodesk also gets a closed profile.  It’s a real issue, but hard to troubleshoot. For me it has always been when the splines were tangent or nearly tangent to another curve. 

[donsmac]

Ditto.

~Don

[Anonymous]

I just ran into this same issue.  The Trim tool didn't prove to provide me any information in my use case.  Though, what did help was slicing the dysfunctional profile with some lines across it.  

I started by making a cross-section of a corner and then worked across the profile.  Each slice became a proper profile, until I got to a slice that didn't.  I left that in-place and then worked the same process back toward this area from the opposite corner of the profile.  This effectively isolated one problem spline segment. in the whole profile.  I was able to delete the problem spline and re-draw just that spline.  After which, I deleted the lines used to make the slices.

Chris