I call this machine the “pantorouter” because it’s essentially a big pantograph mechanism with a router in it. It’s used to route shapes from 2x sized templates. I originally designed it for cutting tenons, but the machine is very versatile and can be used for all kinds of wood joints.
I love Matthias Wandel’s video channel on YouTube. He is an engaging guy with lots of useful content. I was watching this video into pantograph’s. Something I would love to make at some point. It would be amazing. You can buy plans to build the pantorouter from his website. Cost is a very reasonable $18 or you can buy a metal version for $790 + shipping.
From Wikipedia – Pantograph:
A pantograph (Greek roots παντ- “all, every” and γραφ- “to write”, from their original use for copying writing) is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized copy will be drawn by a pen fixed to the other. Using the same principle, different kinds of pantographs are used for other forms of duplication in areas such as sculpture, minting, engraving and milling.