A vehicle sheet metal hemming system (20) and method for hemming vehicle sheet metal outer and inner members (24 and 26) to each other is performed by prehemming and final hemming operations at a single station in cooperation with robot apparatus (42). A drive mechanism (98) has a rotary actuator (100) that moves a tool table (78) vertically to move tool heads (80) between outer idle positions and inner use positions as well as moving prehem tools (82) and final hem tools (84) of the tool heads so as to perform both the prehemming and the final hemming operations.