Draw a bended metal
Bending a metal sheet
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Step 1: Bending radius
Every metal sheet have a thickness as a property and it is important for a creating a 3D model.
Minimum bending radius inside (marked in red color) should be at least equal to thickness of the material that is used. It could be a bigger, of course, but not smaller.
Look at the bottom pictures.
Outer radius (marked in blue color) = inner radius + thickness
P.S. : Sorry for my English and typpos!