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Yes, it could have been form in continuous length and sheared to length, problem with that is the shear would tend to collapse the roll, and there doesn't appear any sign of that happening. Sawing would have been too expensive. My machine would do one side each time, could be built to handle longest side and used for shorter ones as well. Who knows?
I have what's known as a " box/pan combination brake" that I've made dies for to do this kind of bend/roll. A regular box pan brake you only get bends but on the combination brake the bed is adjustable (13" on mine) and can be slid back for roll type forming. My brake is only 50" so it will not do a solid bed side but custom sections is easy. My brake is a 70's model by Roper Whitney.
Yes, it could have been form in continuous length and sheared to length, problem with that is the shear would tend to collapse the roll, and there doesn't appear any sign of that happening. Sawing would have been too expensive. My machine would do one side each time, could be built to handle longest side and used for shorter ones as well. Who knows?
I think it would have been sheered to the length of the box side and then formed
I used tubing for mine and bent the edges very slightly [ have the tool but cant remember name] and welded. The tool allows the weld to be below the area joined.
It is used when two pieces of sheetmetal are butt welded.
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