Abstract: A roll-forming machine for manufacturing purlins from strip material comprises a setup changeover mechanism for converting between a setup that produces purlins having a C-shaped cross-sectional configuration and a setup that produces purlins having a Z-shaped cross-sectional configuration. The changeover mechanism includes an inboard linear actuator connected by an inboard linkage to a plurality of turrets associated with inboard sides of respective roll-forming stations, and an outboard linear actuator connected by an outboard linkage to a plurality of turrets associated with outboard sides of respective roll-forming stations, whereby the turrets are pivotally indexed by operation of the linear actuators to change position of forming rollers carried by the turrets. At least one of the linear actuators is connected to turrets both upstream and downstream from the linear actuator in a feed direction of the roll-forming machine.