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How to preserve constrains to trim edges after editing original sketch?

Innovationlab_CarlosRego
Enthusiast

How to preserve constrains to trim edges after editing original sketch?

Innovationlab_CarlosRego
Enthusiast
Enthusiast

Hello,

 

To make the explanation of my problem I will try to illustrate it with several screenshots:

 

1. So, to start with, I have a lofted surface and a 2D sketch that I use to trim the surface...

 

Screenshot 2016-02-29 13.47.00.png

 

2. Next I create a line whose ends are coincident with the edges of the trimmed hole...

 

Screenshot 2016-02-29 13.48.05.png

 

3. The next step is to edit the original 2D sketch...

 

Screenshot 2016-02-29 13.48.44.png

 

4. As you can see the line does not follow the edge despite the fact that it still show the coincident constraint...

 

Screenshot 2016-02-29 13.49.02.png

 

This problem also happens if the original 2D sketch is projected.

 

My question is... is there a way in F360 to lock the line to the trimmed edge or projected curve so that it will follow that curve after editing the original 2D sketch?

 

 

Thank you in advance for your help.

 

Best regards,

 

Carlos

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HughesTooling
Consultant
Consultant

Have you tried a compute all Ctrl + B after the edit.

 

Mark

Mark Hughes
Owner, Hughes Tooling
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Innovationlab_CarlosRego
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Hi Mark,

I wasn't aware of that command in F360 and just performed that (command+B on a Mac) but the problem remained.

Can it be related with constrains?
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HughesTooling
Consultant
Consultant

I've seen something like this before, I seem to remember if you try and drag the end of the line it would make the constraint work, don't know if it will work for you. Can you export the model and attach to this thread.

 

Mark

Mark Hughes
Owner, Hughes Tooling
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Innovationlab_CarlosRego
Enthusiast
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Hi Mark,

 

Here is the F360 file for you to check.

 

Just edit the first sketch in the component Rib 01 and see what happens.

 

Carlos

 

 

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HughesTooling
Consultant
Consultant

That looks like it's a bug, hopefully someone from support will take a look.

 

I found a workaround though, make another sketch before the trim and make 2 points with coincident constraints to the 2d curves sketch. Then in sketch 4 project the points and draw the line between the 2 projected points, now when you edit the first sketch the line updates. Sometimes you need to Compute All for the update.

Capture04.PNG

I've attached the file, don't know if the work around is any help.

 

Mark

Mark Hughes
Owner, Hughes Tooling
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michallach81
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Innovationlab_CarlosRego
Enthusiast
Enthusiast
Hi Mark,

Thank you once again for your help.

The point project is a great tip and it seems to work although I did had to Compute all several times in order for the editing of the sketch to be fully updated in the Sketch 4.

But this turn around is not solving one issue which is the creation of a loft because once I have the line attached to the projected points, when I perform a loft I get an error message saying that all rails must touch all profiles and I can't create the loft in the end. It's perhaps one of the silliest details in F360 that really need to be fixed ASAP because in this case the projected point is coincident with the rail so the loft should work but it doesn't. Do you have an additional tip to turn around this...

I was checking with a friend of mine that works with other CAD software and by the way it worked in the other software, I'm getting to the same conclusion as you that this might be a bug. If it is I sincerely hope the support solves it soon.

Best regards,

Carlos
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Hello again Mark,

 

After further testing and exploration I found a way for this to fully work.

 

Your "point" tip was a great suggestion but it was not working 100% well because quite often the constrain of the points were also not working even with the calculate all command. And also, as I mentioned on my previous post, I couldn't build a loft.

 

But if instead of creating points, I break the spline and apply a tangent or smooth constrain to the two curves I will get basically a spline with three control points and if I snap the 3D sketch to the projection of that break, everything starts to work quite well and I'm able to perfom dramatic changes on the 2D sketch that everything will update until not only the loft but also even to fillets of stitched edges. And all this without the need to apply the Command+B.

 

But I couldn't have done it without your help. Your "Point" tip was key to find a solution 🙂 Thank you so much for your support.

 

Best regards,

 

Carlos

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