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Every folded control panel, cabinet, bracket, or duct started life flat. Sheet metal bending is what turned it into something three-dimensional. Punch drives down, die catches the sheet, metal folds around a fixed angle. Sounds easy on paper. It isn't. Get the bend allowance wrong and the flat blank comes out short, pick the wrong method between air bending and bottoming and your tolerances drift. Under-size the bending force and the machine stalls halfway through a stroke. A