minimum of one(1) tooth for gear.

[Bloy]

I've been playing with screws and noticed the minimum teeth is three.  Would like to have a single-tooth gear to lengthen(width) in helix form to make single-start screws.  see example in video contest entries....
http://www.youtube.com/watch?v=q5aoTOc3Tak

This program is fun to play with..can see the possibilities!