my advice is watch out for your fingers.
I've been reading about it, the main problem is I'm not sure how to measure corner radius accurately, all the calculations about how to get precise sheet length are based on that radius.
It has been decades, but I seem to remember a "one third" rule of thumb.If you visualize a plane that is one third the depth into the sheet metal and calculate from that, it gets you fairly accurate.I believe the idea is that when metal is bent, the inner third on the inside of the bend compresses, and the outer two-thirds stretch. And bend radius didn't really matter.Just something from the cobwebs, so take this with a 50 Lb bag of rocksalt.Gene
Life is short, we can bend up a prototype and figure out empirically what we need...JR