Pulls lever to lift upper roll, and positions workpiece into machine manually, or using crane. Turns handwheel to adjust roll to set degree of curvature of initial pass. Starts machine and sets feed speed of workpiece back and forth between rolls. Adjusts roll between each pass to form workpiece into specified shape. Hammers workpiece to align it between rolls.
Measures arcs with template.
May set adjustment roll at angle to form conical shapes.