Can we carve, emboss on curved surface ( not cylindrical... , but a manually constructed surface )

uniz_agusto

Can we carve, emboss, draw or extrude on a curved surface ( not cylindrical surface ...  , but a manually constructed surface ) ?
Thanks.

matthew_stacy

@uniz_agusto, I've been wrestling with this same issue.  From what I have seen it is not yet possible to wrap sketches around a non-cylindrical surface in Onshape.

I was able to create a plane tangent to the surface of a cone, sketch on that, and extrude-remove into the cone, but the depth is not uniform (full depth at the center, decreasing to either side).

I would love to see a work-around or software improvement for this.

owen_sparks

matthew_stacy said:

I was able to create a plane tangent to the surface of a cone, sketch on that, and extrude-remove into the cone, but the depth is not uniform (full depth at the center, decreasing to either side).

Just an extrude with the "up to face" and an offset should cover that case I believe?

https://cad.onshape.com/documents/9f26ac1fc159944e425ee7b6/v/913cabf2116094a3134756f1/e/429c04fd031f38814365d2d9


Or you could create a surface with the "Offset Surface" feature then extrude up to that.
Cheers,
Owen S.

robert_scott_jr_

Thanks for the post and especially the link, Mr. Sparks. I just had a couple of 'I didn't know you could do that - that's cool!' experiences. - Scotty

owen_sparks

@robert_scott_jr_
You're welcome, glad you got something out of it.
Owen.

tim_hess427

Does anybody know of any "wrap-to-face" features? I know there's a feature to wrap a sketch around a cylinder, but I'm curious if anybody has taken a crack at generalizing it for other surfaces yet.

matthew_stacy

owen_sparks said:

 an extrude with the "up to face" and an offset should cover that case I believe?
Owen S.

Thanks Owen,

Extrude-remove, up-to-face, with an offset seems to do the trick nicely.

philip_thomas

Great discussion as always - just to be clear there are two 'exact' scenarios.

1) Wrap a sketch on a cylindrical face
2) Project a sketch onto any analytical surface (same as extrude up to face)

Both are supported by Onshape today.

The third scenario is very 'inexact' - 'wrapping' a sketch onto an analytical surface. Imagine the sketch was on a piece of paper.
There is no way to get the paper to lay flat on the surface without it wrinkling. Any solution therefore is an approximation and we do not support this (because we like things to be exact ). I am not saying that it cannot be done, only that today we only support the exact cases.

If there is a specific Engineering need, lets talk about what it would take to address

tim_hess427

@philip_thomas - If we're being precise, the third scenario could really be sub-divided into 3a and 3b, right?

3a - the surface has curvature (not necessarily constant) in one plane (extrude a sin wave as a surface, for example)
3b - the surface has curvature (not necessarily constant) in more than one plane (a saddle shape or sphere, for example)

Wouldn't 3a have exact solutions? 

I don't have an immediate need for these, but could definitely see the value in it. 

konstantin_shiriazdanov

@tim_hess427 I beleve here you can find some solutions

https://cad.onshape.com/documents/0bb13c1b6ed6d4a6dd75cf99/w/b4493d47a45c27ce485c84b9/e/1299ae499a697e3b28bca1e4

tim_hess427

Those look good! Thanks @konstantin_shiriazdanov

MBartlett21

@tim_hess427

The 3a scenario is fairly easy.
As an example, you can convert an 'extruded' face to sheet metal and it will work fine
(Internally, it is classified as GeometryType.EXTRUDED)

Additionally, there are 'cone' faces, which also have an exact solution.
However, Onshape's sheet metal tool doesn't like them

owen_sparks

Hi folks.

3a would seem to cover any extruded profile would it not?

Personally I have a bunch of products shaped a bit like these that I'd like to wrap decals (self adhesive product labels) around:-

Whilst we're at it I'd also like to be able to sketch on that 3d surface and then extrude that non planar 3D sketch to make the decal in the first place

Cheers,

Owen S.

konstantin_shiriazdanov

owen_sparks said:

Hi folks.

Jake_Rosenfeld

We do plan on supporting more developable surfaces for both sheet metal and wrap in the future.  Extruded surface is already in sheet metal and will make its way to wrap eventually, and cone will be implemented for both.

Internally, sheet metal flat view and wrap feature are using the same code.

I don't see an IR for it, so maybe someone can make one