Hobbing and gashing machine.
https://www.youtube.com/watch?v=Ft3u15FL0_c&t=6
Previously:
https://www.homemadetools.net/forum/...458#post162192
https://www.homemadetools.net/forum/...964#post152981
https://www.homemadetools.net/forum/...817#post124493
https://www.homemadetools.net/forum/...515#post110808
https://www.homemadetools.net/forum/...595#post101995
