Three-Jaw Self-Centering Chuck 27 August 2017, 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! Combination of screw-nut, gear-rack and rack-rack mechanisms. Turn the sole orange screw for moving the jaws. « previous mechanism Geneva Mechanism next mechanism » Snap Motion load comments Please enable JavaScript to view the comments.