Leonardo da Vinci designed a rolling mill for shaping metal into thin sheets.
A rolling mill passes metal between rotating rollers, reducing its thickness and producing a more uniform sheet. Leonardo’s design applied controlled rotary motion to metalworking, showing how mechanical power could replace or supplement repeated hammer blows.
His notebooks contain detailed studies of rollers, gears, and related workshop mechanisms. The design reflects Leonardo’s practical interest in manufacturing as well as his theoretical study of force, friction, and motion. Metal sheets were useful for armour, tools, decorative work, and other products.
Leonardo’s rolling-mill concept should not be mistaken for the enormous powered mills developed during the Industrial Revolution. The basic principle, however, is recognisable: rollers compress and elongate metal. The historical importance lies in the early mechanical formulation of a process that later became central to industrial metal production.