How to design and construct a metal bending machine?

To design and construct a metal bending machine, start by defining the specifications, including the types of metals and thicknesses it will handle. Create a sturdy frame using steel or aluminum for stability, and incorporate a bending mechanism, such as a hydraulic or mechanical lever system, to apply force. Ensure that the machine has adjustable stops for precision bending angles and include safety features like guards and emergency stops. Finally, prototype the design, test for functionality, and make necessary adjustments before finalizing the construction.