What machine did Leonardo da Vinci design to make a rope by twisting strands together?

Leonardo da Vinci designed a rope-making machine to twist strands together.

Rope is made by combining fibers or yarns and twisting them so the strands reinforce one another. Leonardo's mechanical studies included devices intended to automate this process, using rotating components and controlled tension. Such a machine could make rope more consistently than hand production.

The idea belonged to Leonardo's wider interest in labor-saving machinery. Rope was essential for ships, construction, wells, lifting equipment, and military engineering, so improvements in its manufacture had practical value across Renaissance life.

Leonardo did not invent rope itself or all rope-making machinery. Rope-making is ancient, and earlier cultures produced cordage from plant fibers and animal materials. His drawings are notable because they show an effort to mechanize a familiar craft. Modern rope factories use powered twisting machines and synthetic fibers, but they still depend on the same basic principle of combining and twisting strands.