I'd be interested to hear about the bucket thresher. Most of the DIY options I found when I was looking where larger with custom flail mechanisms and bike-chain drives etc. Honestly, building the thresher itself seemed like kind of a cool project on it's own, but it was just more effort than I was willing to put in. But a 5 gallon bucket option that runs of a drill sounds much more my speed.
How much did you process? What is the maximum amount you think you would have been willing to process with that method?
I did about 3 pounds at once, but could have done more. Maybe 5 pounds. It goes fast, so you can do multiple smaller batches more quickly than the bigger batch.
I made a round out of plywood to put in the bottom of the bucket, drilled a hole in the center, and put a steel pipe end cap in it. I put a ball bearing in the end cap. Then a threaded rod up through the top resting on the bearing. I cut a round of plywood for the top of the bucket, chamfered to fit snugly. I drilled a hole in the center of that and put a pillow block on it to fit the threaded rod. On the bottom of the rod I put two pieces of flat stock about 1/2 from the bottom and about one inch above that one, just held on with nuts. That's pretty much it. There are lots of YouTube of variations on that design. Runs with a corded drill. Cordless might work for very small batches.
I just used a box fan for winnowing. I built a 5 gallon bucket thresher to use with a drill. Worked really well.
I'm doing winter wheat this year for bread.