Inventor 2013-I'm working on a sheet metal cover using contour roll and I find when I dimension the flat pattern that radii that should be the same are not. Can someone tell me if my approach is fundamentally flawed? I tried making this part out of one 220 degree contour roll and I found when dimensioning that the center points of the arcs are not symmetric as expected. I then used two contour rolls to create the part basing the second contour roll on the first contour roll sketches and I still have the same issues. Any thoughts would be appreciated. Thanks
You most likely need to read up on Bend Allowance Factor. This will vary according to the type of bending procedure used. The Flat-Layout length is determined by the neutral axis through the material. Not quite the center line of the product.
The attached spread sheet might help you out.
thank you for you quick reply, I took a look at the spread sheet and it looks like I have a lot to understand in order to properly apply all possible variables to my project. In the mean time while I try to figure this all out and understand the spread sheet, does it make sense that these variables create the problems in symmetry that I see in the flat pattern dimensions?
thank you for you quick reply and example, your solution sure is elegant compared to my attempt. now I have to go back and see if it fits my mating part and if I can create the remaining parts to the cover in a similar fashion, thanks again.