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How to use the same sketch in two different lofts
I'm a very amateur hobby user of Onshape. I use it mostly to draw plans for model aircraft then visualise them in 3d, thereby (hopefully) finding my mistakes.
I have a situation where I want to create two lofts, one going "down" (i.e. negative Z direction) and the other "up" (postitive Z) using the same sketch item (in the XY plane) as in the diagram below, but one of them needs to be using Shape A and the other Shape B. I haven't been able to discover how to do this. I tried extruding the shape by 1mm, but I couldn't get the loft function to recognise the face of an extrude. I tried creating an offset surface also at 1mm, but similarly I couldn't get the loft to recognise the surface. The only thing I have been able to think of is to create another plane 1mm (or less) away from the original plane and create a whole new sketch on it. Seems like a very kludgy solution to me, and I'm sure Onshape has a better way. I just don't know what it is.