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2D polyline to 3D surface


Tmcg

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Good day

I am a beginner in AutoCad and really struggle with the attached drawing.

I have managed to make the bottom profile a solid but I just cannot manage to convert the top polyline to a surface.

My goal is to use the loft tool to create a solid profile changing from the bottom shape to the top shape 2800mm path in Z axis.

I created the top polyline from the bottom polyline I just flattend the two sides by rotating and drawing four new lines.

 

A step by step explanation of what I am doing wrong will be highly appreciated please.

My steps were,

Join the lines and archs to create a polyline, result were 44 lines joined

Pedit width of polyline to 0.3

Then tried to convert without success

 

 

Thank you

 

Profil.dwg

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