Worm Drive Gears

Edit: I would recommend printing this version that turns the screw vertical and cleans up the stl files:
http://www.thingiverse.com/thing:2303403
Thanks dnewman!


30 to 1 worm drive reduction gears. 3 parts. Could be used in a clock in addition with a 2 to 1 reduction due to ratio. The worm wheel is helical.

https://youtu.be/VE7kmcveCOQ