A few years back I bought this grain grinder on E-bay.
It works great for small quantities and grinds a range from coarse to flour. We use it occasionally, like today when we need some creep feed for our bottle lambs and all the feed in the farm store was laced with anti-biotics. So, we have to make our own.
Here’s a sample of the coarse grind. It takes about 15 minutes to grind up about 50 lbs of corn.