What machine did Leonardo da Vinci design with a rotating drum to make rope?

Leonardo da Vinci designed a rope-making machine with a rotating drum.

Rope-making requires twisting fibers or strands together so that friction and tension create a stronger, continuous cord. Leonardo’s machine used mechanical motion to help organize and twist the material, reducing the need for entirely manual work. His drawings show how gears and rotating components could coordinate the process.

The design belongs to his studies of automated production and labor-saving machinery. Renaissance workshops already made rope by hand and with specialized equipment, so Leonardo was refining and mechanizing an existing craft rather than creating the basic idea of rope from nothing.

The machine is sometimes confused with a spinning wheel, but spinning wheels primarily twist fibers into yarn. Rope-making joins strands into thicker cordage and requires different handling of tension and rotation. Leonardo’s designs often focused on this distinction between a material process and the machine that controls it.