waterjets are able to cut anything...to a point.
a machine shop i used to work in just purchased a cnc waterjet, and i was there for the test cut after installation. the technician took a peice of 2-1/2" thick stainless steel, and cut a biohazard logo out of it. took 1 minute to do all the intricate details it had
amazing. so certainly, you could cut your gears with it.
ps... waterjets cut glass too
