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 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.