In the fabrication industry, one of the critical challenges is to maintain close geometric tolerances in finished products, particularly in the air bending process.
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Mechanical Engineering Magazine Select Articles. Assembly Challenge: Mating a Spherical Face with a. Autodesk Inventor Tips from Around the Web. Problems Saving Files: Files Can Not Be Saved and. Understanding Bend Allowance and Bend Dedcution in. iLogic: Use a Part iProperty to Get a File Path. Networked Seat of Inventor Won't Start / Doesn't R. Using iLogic to Find Dimension Overrides. So if you had a simple model with two legs that were both 25 mm long and if you were to flatten this model you'd find that the total flat pattern length is 44.786 mm: 
To calculate bend allowance you use a formula that includes a Kfactor. Kfactors are used as a good approximation of the theoretical percentage of the material thickness at a bend, where it is neither stretched or contracted.
Your Inventor sheet metal parts will use a Bend Allowance when you have your unfold method set to use a Kfactor. Bend Allowance and Bend Deduction are not interchangeable terms, so understanding when your parts are using one or the other, or if the parts are using both will help.
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