Timing belts and pulleys

I tried a new approach to cutting pulleys - instead of a flycutter
having a tool in the shape of the desired groove, I drew up the pulley
desired (20 tooth, XL) in CAD, and set things up to use a 1/16 inch
endmill. With the workpiece aligned 25 degrees CCW, I first cut one
edge of the groove, then a flat corresponding roughly to the radiusing
on the other side of the groove's shoulder - repeat for each tooth,
then rotated 25 deg. the other side of center, repeated with the
opposite shoulder.

More later if anyone wants... / mark