Boolean Shere Cutout

9-14-08 I was explaining to one of my students what a Boolean difference is and how it works in Rhino3D.  To do this I usually draw a cube then a sphere which intersects the corner of the cube.  Using Boolean difference I cut the corner out of the cube leaving a spherical void. The whole thing takes about 30 seconds and gives a good understanding of the concept.  When I had finished he asked me if I could cut that on my router.  Being me, I had to actually do it so I could pass around the part in class.  Here we go. I imported the shape into my 3D CAM software and proceeded to create a tool path using a 1/2" ball mill. Here are the simulated results of the roughing pass... and the finish pass with the same tool. Here is the mostly complete roughing pass on the router. Part-way through the finish pass. Completed demonstration.