Do you use AutoCAD in a sheet metal manufacturing environment? Do you perform bend allowance calculations for traditional sheet metal flat development? Take a look at Owen’s Autodesk University course on the subject (in MS Word ‘95 format): FlatDev.zip (104k). The course provides a system of generic formulas and instructions. You’ll also want to download the two associated AutoLISP functions: an AutoCAD based interactive bend allowance calculator (BCAL.LSP) and a developed blank size calculator (BDEV.LSP), both available on the Freebies page.