Drilling Hexagon Holes 22 April 2019, 19:30 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Device for drilling hexagon hole of rounded corners based on the principle shown in “Drilling hexagon holes 1a” « previous mechanism Globoid Worm and Pin Gear next mechanism » Helix Torus Joint load comments Please enable JavaScript to view the comments.