We have switched from Inventor to Solidworks very recently and we are making basic models with Solidworks. At the moment we are having some trouble with a sheet metal double side flanged tube modelled by swept flange. When we change the diameter via global variables fold direction changes. This is happening random. For example we type 500mm, galvanized surface is at outside. Then we change it to 450mm and galvanized surface is at inside. After we switch back to 500mm it stays in inside or outside, totally random.

We are trying to find an option to keep galvanized surface at outside but we could not succeed so far.

Thank you for your time.