The guys from the YouTube channel How To Make Everything have been looking at one such sketch, a screw thread ... that the machine was viable using nothing but wood for construction.
Pieces of wood can be joined together in many different ways. Nails, screws and glue are the most common ways to join wood together. When making these joins, wood can be arranged and joined ...
This is no ordinary set of combination ... perpendicular to the screw for maximum grip or vertically over the top of the screw for heads just barely poking above the wood surface.
Threaded wood ... metal screws appeared, but being hand-made they were not very regular and were only popular in limited applications. Job and William Wyatt patented a screw machine in 1760 ...