What I have encountered is that when working with aluminum (3003) this formula is close, but it will cause the formed part's flanges to be a few thousandths of an inch too long.ĭo I need to use a different percentage of the material thickness to figure my bend allowance? Does anyone know where I can get a chart or table for determining bend allowances for materials other than mild steel? The formula I currently use for a 90 degree bend is (1/3 material thickness + bend radius)X 1.5708. What I would like to find is some type of chart or table that shows bend allowances for other metals (aluminum and stainless) for the purpose of laying out correct flat patterns. Our company fabricates panels from common steel sheetmetal (ASTM A569) and I have plenty of information available as to bend allowances for the sheetmetal based on the thickness of the material and the radius of the punch to be used to bend it. Here's one I bet you folks have come across before.
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