For years I've been dreaming of cutting wood threads with shop made tools. The other day I saw Roy Underhill make a tap for cutting threaded nuts. This sparked an old interest. However I missed the show where he made the screw box. Has anyone made a screw box? If so, how? I'm going to give it a shot, but I like to learn from other's experiences, instead of trial and error. Is there a magical formula for thread pitch, and size for wood threads?
Thanks...