topic Re: Wrapping a sketch on a surface in Fusion Design, Validate & Document Forum

Wrapping a sketch on a surface

gatzelabordus — Fri, 23 Sep 2022 17:33:19 GMT

I try to wrap a sketch on a surface. I tried it with 'project to surface', but is not really wrapping, like when you cut something out from paper on put it on the surface. Some dimension are changed. For me it is really important that the dimension are NOT changed, because I make a so called tongue drum from a gas bottle and the length is important for the frequency. Here is an image:

Also tried with embossing, but it does not accept the surface as input.

Anybody knows a solution for this ?

Re: Wrapping a sketch on a surface

jeff_strater — Fri, 23 Sep 2022 17:41:40 GMT

there is no way, today (at least that I know of) to do this. We are working on enhancements to Emboss to support surfaces like this, but that project is still under way.

Re: Wrapping a sketch on a surface

TrippyLighting — Fri, 23 Sep 2022 17:42:15 GMT

Every "wrap" or in more technical terms UV mapping onto a non-developable surface (compound curved surface) will cause UV stretching. That is a mathematical necessity.

If you map the rectangle in your screenshot onto the surface below, the sides will curve. You might be able to keep the length of these curved sides the same, but the surface area will change as is now isn't flat anymore but curves through space.

Or you might want to keep the surface area constant, but then one, or both side will have to change in length.

You may want to provide a bit more detail on what you are trying to achieve.

Re: Wrapping a sketch on a surface

TrippyLighting — Fri, 23 Sep 2022 17:46:38 GMT

@jeff_strater wrote:

there is no way, today (at least that I know of)

The double bend sheet metal technique can do that. Starts about 20 minutes into this tutorial.

Re: Wrapping a sketch on a surface

gatzelabordus — Sat, 24 Sep 2022 05:52:41 GMT

I'm busy to make something like this:

The most important distance is where I put a red line (determine's the frequency if you hit it), that's why it is important that it is a real 'wrap' from a plane sketch. The width of the cutouts or less important but as width as possible.

Re: Wrapping a sketch on a surface

tanwinghoe1983 — Sat, 24 Sep 2022 07:14:06 GMT

Since the emboss cannot be done on the current surface, I created a surrogate body with curvature in only one direction. This would allow you to perform the emboss. With this way, I can get a true wrap of the centerline of the tab. But I don't think I can get a true wrap of the side edge that you indicated in red. Attached is the file.

Re: Wrapping a sketch on a surface

gatzelabordus — Sat, 24 Sep 2022 07:22:51 GMT

Thanks, that looks usable, then I need for every cutout an additional extrude/body for the embossing.

Re: Wrapping a sketch on a surface

tanwinghoe1983 — Sat, 24 Sep 2022 07:30:45 GMT

A circular pattern of the surrogate body should work well.

Re: Wrapping a sketch on a surface

jhackney1972 — Sat, 24 Sep 2022 18:20:02 GMT

You did not supply a model so I made a sample. Take a look at the video and see if the process will work for you. Model is attached.

(view in My Videos)