Reverse Engineering Shape with Surface Modeling

rubenskaya_poop

I have this shape that I want to reverse engineer , im not very great at surface modeling and its giving me headaches I tried doing a loft extrude and thinking I would cut the excess material on top with some kind of surfaces but I can find a way to do it properly. Please guide me for the best way to reverse engineer this shape.😀

Here is the link : model

jelte_steur_info

perhaps a single extrude with some draft may work.
It depends on how precise you need it to be. Best thing is to create a surface bigger than the loft and trim (split part) it in one go.
the surface could be a constrained surface, or is it perhaps close enough if you revolve a surface?

eric_pesty

Have you tried the "constrained surface"?

Also check Evan's great videos on the subject, like this one for example:

https://www.youtube.com/watch?v=rscjUkmr-8g

jelte_steur_info

perhaps a single extrude with some draft may work.
It depends on how precise you need it to be. Best thing is to create a surface bigger than the loft and trim (split part) it in one go.
the surface could be a constrained surface, or is it perhaps close enough if you revolve a surface?

rubenskaya_poop

Thank you! This got on on the right path, I will try Evans custom features that might help also.

👍👍

rubenskaya_poop

https://forum.onshape.com/discussion/comment/129945#Comment_129945

I tried the the split comand on the loft using a surface a cut surface but got and error and couldnt continue.

Im not sure how a revolve would help...

rubenskaya_poop

I have managed to get one step closer using constrained surface.

rubenskaya_poop

Video_2026-04-24_23-56-35-ezgif.com-video-to-gif-converter.gif

Thank you guys