The sketch offset will not select chained loops of projected curves.

[Anonymous]

Hello,

I have been using SlolidWorks for many years, but I have recently been trying to learn Fusion 360. I really like the software so far, but the most annoying aspect I have come accross so far is the sketch offset function. I use is frequequently and run into an issue almost everytime. I cannot get a chain selection to offest. Here is an example:

I have projected curves onto a sketch plane, but I have never gotten the offest function to select an entire chain loop. It will only select one or two curves at a time. I can individually select each curve and use the offset function over and over, but that is time consuming and really annoying.

Is there something I am doing wrong? 

Thanks!

[Phil.E]

I cannot reproduce this. Can you share the file?

[arcleveland]

I'm having the same issue. It is very annoying. If you create a sketch and draw a rectangle, then close that sketch and create a new sketch and project the rectangle from the first sketch the projected sketch cannot be offset as a chain selection. Each line has to be selected individually. I know there is a work around projecting geometries instead of sketches, but this isn't an option for me in my current design.

[rushabhthakkar_910]

I am able to offset the whole sketch at a time, and not individual lines... 

[mango.freund]

Hello, don't you see the problem? these bright circles indicate non-closed lines. in this case it was apparently mirrored several times. that is why full black sketches are so important. usually a double click on the line before the offset also helps--- mango

[rushabhthakkar_910]

You are absolutely correct. But I fear if we get a reply on this from @Anonymous... It's been a long time...

[Anonymous · Accepted solution]

I'm still here! It's been five years and I think they have fixed the issue. I don't have trouble offsetting projected or intersecting curves anymore.

[arcleveland]

Hi all, Thanks for the replies.

You are correct that the projection line sketch has white insides at the coincident points, indicating that the sketch is open? If I open the original sketch the whole sketch is fully constrained to origin etc and all coincidences in-place but still white insides all all the coincident points. I feel like I'm missing something really basic here. I have found that it is way better to project from bodies rather than sketches, and this works great, but thought it interesting to keep the conversation going so that I can learn.

[rushabhthakkar_910]

Maybe this video can help you... https://youtu.be/C11L136U0vQ

[arcleveland]

@rushabhthakkar_910 

Thanks Rushabh, but that is some fairly basic sketch constraints information, which I always follow. I think the takeaway from this discussion is:

• Don't project geometry from sketches. They are unstable if deleted or changed, and don't come through as linked lines so can't be offset without selecting each line individually.
• Only project geometry from bodies. They are far more stable and update if the base sketch for that body is changed. The projected lines come through linked so can be offset without having to select each line individually.

Please correct me if I'm wrong I'm wrong here.

[abd2021]

I am having the same issue, that is why I am in this thread.

I think you are absolutely backwards. In my experience, projecting features of body results in converting the projection into fixed curves (green), if something before this feature is modified. My guess is that when something is changed, bodies might be re-calculated and the projections loose their link since the thing they are referencing is not there anymore (re-calculated).

That is why I started projecting sketches for down the timeline features, instead of the bodies.

But I think problem here is with the Offset command in sketch. I have found it to be buggy. I know for fact if there is Offset geometry and a little complex geometry, fusion fails to sort out changes in the sketch.

In my case, the master sketch has offset geometry and sketch that is projecting geometrical feature from that sketch has further "offset" geometry is made, fusion 360 quits & starts doing stupid stuff that doesn't make sense. Basically, I am working on an assembly where a part fit into another parts via a pocket. So the pocket needs to be 0.1mm bigger. Pocket sketch is referencing the mating feature sketch.

What do other people think??