Pin Gear Drive 26 December 2016, 19:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! An advantage of a pin wheel (the yellow one): it can work at the same time as a gear with external and internal teeth. « previous mechanism Safety Clutch (Helical Gears) next mechanism » Turning Multiple Start Thread load comments Please enable JavaScript to view the comments.