From Improbable Construct:
In this Instructable I will show you how I made a Mini Bend Brake to bend some 1/16″ aluminum.
I needed to make clean straight bends in strips of aluminum for my Hidden Bookshelf Light Switch.
I had pretty good luck bending the aluminum in my bench vise, but it was hard to keep the bends square and even. So, this is what i came up with.