For Magnabend sheet metal folding machine,Magnetic sheet metal pan and box brake There are a myriad of possibilities for special tooling.
Here are some sketches to give you the sort of idea:

Magnabend When using a non-attached pipe to form a curve please note the details in the drawing below.
It is most important that the parts are arranged in such a way that the magnetic flux, represented by the dashed lines, can pass into the pipe section without having to cross a significant air-gap.