It is a perfectly legitimate workflow in the FreeCAD paradigm.V12StealthHunter wrote: ↑Tue Dec 07, 2021 5:39 pmThe common approach is to draw a sketch or pocket on the surface. For tubes, this does not work and you are met with an error. Hence the method described in this thread does not feel like its a natural or intuitive workflow in FreeCAD. It feels like a workaround for an error that only if you visit the forums, you would learn how to workaround.
It is well documented that the FreeCAD paradigm does not include drawing sketches on non-planer surfaces.
It is possible to map sketches to curved surfaces. That is the province of the Curves workbench.
MangoJelly Solutions provides an excellent tutorial on this: https://youtu.be/ldPFgQsh3Nw