I am making ducting for the engine cooling plenum on a homebuilt airplane. Material is 0.032 2024t3, which is quite stiff. I need to make 2d bends i.e. No shrinking or stretching to go from a square section to a radiused section. I ave been doing it by many small bends in a finger brake. It works but it is a bit hit and miss and leaves a faceted surface. Are there any other good tricks out there for doing this?
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