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FreeCAD Tutorial: Shovel - Curves Workbench, Sweep Along 2 Rails
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Learn FreeCAD Curves Workbench [01] Sweep Along 2 Rails, Join Curve, Nurbs surfaces Practical Guide
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Following the tutorial i was not satisfied with the shape, hence i choose an alternative approach to obtain a more realistic result:
rails are the sides and ruled surface is from back to tip (the tutorial does it the other way around)

sweep:
for a better shape i chose the sides as rails instead of back + front
Blendng:Rail2instead ofBlend
approximation curve:
increased
Approx Toleranceto1mmDegree Max:5