It is known as the chain saw mortiser. In indoor woodwork especially, an immense quantity of mortise and tenon work has to be done, and machines for the purpose have been used for many years.

One common joinery method used in wood working is the mortise and tenon. A mortise is basically a hole in a piece of wood and the tenon is another piece of wood cut to tightly fit in that hole.

Imagine a tool that can drill square holes. Enter: the mortiser. Similar to a drill press but utilizing a special drill bit ...