base flange will not unbend simple c-channel what am I missing
I modified your model, usually I don't model the thickness of the plate, use the base flange for that.
Have a look at what I did, this model flattens, the dimensions aren't correct.
Just draw one set of lines depicting the shape....
only sketch single line as shown, no radius. you define the thickness and radius in the sheetmetal feature.
or do a single straight Line and add Flanges.
Here is the reason why
These two arcs are Splines
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