Barrel Cam for Deg. Rotation 23 December 2016, 22:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Pull and release blue frame to let green barel cam linearly reciprocate and turn 180 deg. for each stroke. Blue spring forces orange pin towards the cam. Key factor is different deepths of the cam grooves. « previous mechanism Rack Pinwheel Drive next mechanism » Cable Drive load comments Please enable JavaScript to view the comments.