FreeCAD Arc Sweep Issue

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While preparing for this lesson I encountered a problem with sweeping an arc. I wanted to show you how to fix it, but when recording this lesson everything worked.
I am using the FreeCAD Release Candidate, so sometimes some errors may appear.
However, even though I managed to do it, I also showed a way to fix it if it didn't work.
I also show a way to remove a part of the 3D model.
FreeCAD for Complete Beginners Course - cadcamlessons....
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