The bend allowance is the material added to the actual leg lengths of the part in order to develop a flat pattern. When that metal deforms, a small amount of length is added to the original part. Deductions have to be made from desired part sizes for flat patterns to results in a correct flat size. When sheet metal is bent, the metal around the bend becomes deformed and stretched. INSTRUCTIONS: Choose units and enter the following:īend Allowance (BA): The calculator returns the answer in inches (in). However this can be automatically converted to compatible units via the pull-down menu. In this example, the Kerf Bend Allowance is approximately 0.1106 millimeters. The Bend Allowance Calculator uses the thickness of the material, bend angle, inside radius, and K factor to find the bend allowance. KBA (2 2 (10 + 0.5)) / 360 KBA 0.1106 mm.
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