Drilling Square Holes 15 September 2017, 13:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Reuleaux triangle rotates inside a square. Loci of various points on the triangle are shown. The red locus is the section of the drilled square hole. Its corners are rounded. An inscribed round hole of the square hole must be predrilled. « previous mechanism Mechanism for Drawing Heart Shape next mechanism » Spatial Motion Control load comments Please enable JavaScript to view the comments.