So I had this job fall on my lap yesterday afternoon, my boss forgot to put it in production before leaving for his hunting camp so I had to scramble to fabricate them without any CAD files because I have to deliver them tomorrow morning.
Here's what it look like layed out on a flat sheet
So for a 16'' radius over an 85° arc section I decided to do 18 bends, which gave me 4.72° per bend. I needed a rectangular opening of 6'' x 1 7/8'' at the other end, so all my bend lines finished 3'' from the center line on either side. The angle cut on the square end I figured out with a piece of cardboard and scissors.
Confirming with a high end gauge
First bend to get my two parallel sides, it needed a bit more pressing
Then I repeated that 3 more times and put out a 1600$ job in 4 hours times... which is funny because that was including production of cad drawings and laser cutting the parts from DXFs which wasn't done.
A calculator, some cardboard and experience is all that was needed, fuck fancy designers and their fucking CAD files.