Tube and Shape Bending

“Tube and Shape Bending,” Alcan 16mm Film Catalogue (Montreal: Aluminum Company of Canada, Limited: c.1960), 22.
“Proper procedures for bending aluminum tubing and shapes. The important problem of how to keep the tube round at the point of bend, with a minimum reduction of wall thickness, is answered graphically. Consideration is given to the alloys and the bend radii required for various sizes and shapes of tubing. Close-up views showing workmen bending aluminum by hand and in bending machines, demonstrates how simple and multiple bends are made. Helpful hints on both hot and cold bends are made. Helpful hints on both hot and cold bends are given and the value of the proper lubrication and well-polished tools is stressed."