Flakes do not. The other two do. I've never used a processor, but I can imagine that it's not very good at what you're trying to do. Some grains would get pulverized, others would remain untouched. My suggestion (this is what I did prior to owning the barley crusher) is get a big heavy duty ziploc bag and put the grains inside...then run a rolling pin over them until they're crushed. Works very well for specialty grains, though I wouldn't rely on it for base grains.