I have seen some great home-made bending presses. But I wanted to fold up a box from a single sheet of aluminium with the edges turned right over on all sides. This can usually only be done on a press with removable and cutaway noses (the bit over which the bend is formed is called the nose). This is what I had in mind. The box is for the heater on my vacuum forming machine.
The aluminium I bent was 0.038in or about 1mm thick and the longest bend was 310mm, just over 12 inches.
Clamping handyman bench
Wood saw and plane
Hot-melt glue gun
Two shelf boards (mine were melamine-faced chipboard)
An old car seat-belt
The Homemade Mini Bend Brake http://www.instructables.com/id/Homemade-Mini-Press-Brake/#intro looks great for narrow strips, but couldn’t bend up four sides of a rectangle.
In bending, there are two big problems – holding the metal against the bending nose, and stopping the metal from sliding out of the press. Also the hinges have to be very strong.
As I haven’t any welding gear I wanted a hinge I could use with wooden boards. They are old melamine faced shelf panels. I connected them with strips of seatbelt webbing fixed with hot-melt glue. The belting is in tension when it holds the top board against the workpiece. These pictures show how it works.