i ground yellow dent corn, 'deer corn' , into cornmeal with excellent results in a champion juicer with grain mill attachment. 25lbs per hour, about. dusty, noisy, and effective.
great taste. sifted it once and reground siftings..
the corn took a LOT of cleaning. pull broken grains, cob, rocks, stalk, OUT.. every grain you grind, LOOK AT!
that ain't optional. be religious about 'picking' your grains and beans.. it may save a tooth, it will improve storage times and flavor, and you KNOW you aren't about to toss a rock in your grinder.
bad idea to NOT know..