topic Re: Cutting Sketch in Fusion Design, Validate & Document Forum

Cutting Sketch

Anonymous — Sun, 29 Mar 2015 00:12:25 GMT

Hi, does anyone know how to cut a sketch where it intersects at a plane, or how to sketch so that a line drawn on one plane has to end on another intersecting plane? In the picture below, I have marked the shape I am trying to cut in light blue, and on the lower two views, I have marked the intersecting plane that I want the blue shape to be cut by. I also have the link to the file pasted below so that you can download the file if you want to experiment.http://a360.co/1Eie91Q

Re: Cutting Sketch

jeff_strater — Sun, 29 Mar 2015 16:42:22 GMT

Hi, I'm not exactly sure what you are trying to achieve here, can you possibly add some more details? The model that you shared does not contain this blue shape, so I had to guess a bit what it was supposed to look like.

Here's what I tried to do to reproduce it:

Then, I projected the other plane (plane12) into this sketch (actually, this didn't work correctly, which I think is a bug, and I'm investigating that, so as a workaround, created a sketch on that plane, and drew a line and projected that line into this new sketch). Then, I trimmed my parallelogram against that projected line. This is what I got, but I'm not sure that this is what you wanted:

ANyway, any clarity that you can add will help. You can also turn on 3D sketching, if what you are trying to do is make a 3D sketch here.

Jeff Strater (Fusion development)

Re: Cutting Sketch

Anonymous — Sun, 29 Mar 2015 23:36:27 GMT

Hi Jeff, it is good that you had found the bug!

Re: Cutting Sketch

Anonymous — Mon, 30 Mar 2015 11:49:55 GMT

Thanks, I am trying to make something similar to following bottle without the cap. if you check the most current version here, it shows a semi decent but not connected and well done rendition of what I did on one side, however, I want it to all be connected and done properly. Ill try to make everything I post here a seperate one so that updates wont change the one I posted.

Re: Cutting Sketch

jeff_strater — Tue, 31 Mar 2015 04:35:24 GMT

OK, I see now. Cool design.

There are probably many ways to address this design. If I have time, I will try to post some workflows that I might consider. One of them might be to use 3D sketching instead of just 2D sketching. Another might be to start with a solid and remove material to get this shape.

But, your approach is just as valid, so I'll start with it (although I took a shortcut to get there, which is yet another approach to start from the beginning). Here's what I did:

First, there is one triangle missing from sketch 14, so I edited it, and added that triangle. I also added another line at the midpoint, which will be used later:

Then, in the Patch workspace, the Boundary Patch command can be used to make surface bodies from the sketch regions:

you will notice that I did not do all the regions - that's my shortcut - I'm only going to do one side of this...

next,add a workplane through that sketch midpoint line:

then, use the Stitch command to stitch everything together:

This is the result:

Next, I want only half the model, so I'll use Split Body to split using the workplane:

Here is the result:

Finally, use Mirror to get the left half of the model:

And one final stitch to make it a solid. This is the result:

I have also attached the completed version here, if you are interested

Hope you find this helpful

Jeff

Re: Cutting Sketch

Anonymous — Tue, 31 Mar 2015 10:37:43 GMT

Thank you so much, I could not have done it without your help. Out of interest, is there a way to export the faces into a picture so that I could make this into a paper box?

Re: Cutting Sketch

jeff_strater — Tue, 31 Mar 2015 21:56:52 GMT

Here is another way to model this shape as a solid:

Start with this sketch. The angled line will be used later:

Then extrude it to half the ultimate desired width:

Next, add an angled workplane through that angled line:

the angle determines the angle of the side face.

Next, use Split Body to split by this plane:

Then, use Mirror to mirror this front half:

and mirror again, side-to-side:

giving the final result:

I will try to answer your unfolding question. This may require a slightly different approach...

Jeff

Re: Cutting Sketch

jeff_strater — Wed, 01 Apr 2015 01:25:40 GMT

OK, on to your "paper box unfolding" question. In general, Fusion does not yet have any sort of unfolding capability.

However... I was able to fake it, sort of...

This will not work in all cases, and does not account for any deformation caused by folding, etc.

So, I started with the same basic model as yours, but I skipped the final stitch, so each face of the design was a separate body:

Then, I used Create Components From Bodies:

to put each face into a separate component.

Next is the trick. Use "as built" Revolute joints to define the folding lines:

And continue to define revolute joints where you would unfold this:

Then, once you have all the joints defined, it's a case of using Drive Joint to fake out the "flatten" process:

This was a bit tricky at times, it required doing some measuring of angles, and some angle complement calculations. but, I was able to get to:

Model is attached...

That was kind of a fun way to spend a bit of time.

Jeff

Re: Cutting Sketch

deyop — Wed, 01 Apr 2015 15:31:37 GMT

That's an incredable job of unfolding. I couldn't resist trying a T-Spline approach to developing the bottle shape. One advantage with the T-Spline approach would be playing with the shape and developing alternatives. Here's a screencast of how I approached it. Thanks for the inspiration.

Re: Cutting Sketch

Anonymous — Wed, 01 Apr 2015 16:21:17 GMT

WOW.

I have to say, I am astounded by the amount of effort and quality you put into these responses, and you did do a lot. You solved both my problems, and got me the results much quicker than I would ever have expected. Thank you so much for all the time you have put into this, and for making such great instructions on how to do them, which will help me a lot when I use fusion in the future. This has to be the best help I have ever gotten with any product, including one where I knew the owner. Have a great day, and a pat on the back (if anyone seeing this knows him irl, please deliver that pat on the back)

Re: Cutting Sketch

Anonymous — Wed, 01 Apr 2015 16:27:22 GMT

That looks great, I will look closer at the sculpting tools as well as the others as through this topic, I have learned about so many great things in this great piece of software.