Rotate it a bit and look again (if you can visualize this). They cut smooth.
"DJ Delorie" wrote in message
...

Steve Knight writes:
http://www.byrdtool.com/

Ok, I checked these folks out. Since the cutters aren't square to the
axis, they can't make a flat surface (the cutter corners are slightly
futher away from the center of rotation than the center of the faces;
they should make shallow beads and leave lines on the wood). Can
anyone explain what they were thinking, and/or how this really works?