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Matt, I understand and support information sharing, hence all of my posts, however I feel I must refrain from posting pictures of a dangerous tool built from scrap metal as I would not want others to attempt to copy its design... the forces (80,000 lbs) here are no joke... there are plenty of well engineered designs to glean from.
But to not be an entire buzzkill, it is similar to most press brake designs with a double angle lower "W" die, and the upper die has a piece of 1 3/8" solid bar as the pressing point instead of a sharp v. The tonnage required is a function of the spacing of the lower die when "air bending" vs bottoming out. Air bending doesn't result in a perfect sharp 90 anyway. The radius helps the air bend form a nicely curved profile. Also reduces stress and weakening when bending thicker pieces.
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