this is a little something that i put together a little while back because im too lazy to grind by hand..
this used to be a coffee grinder, but i took it out of the cabinet and stripped it down to the grinder part and put a switch and a big funnel on it for grinding dried food for making corn, bean, and rice flour.. you can grind a 5lb bag of rice flour or corn meal in around 4 minutes with it.. i got two of them that i got out of a scrap bin for about 2$ a piece..
here is a tub of rice flour on the left and a tub of corn meal on the right that i just got finished grinding..