I have been putting off making a good charcoal grinder for a long time, as I did not have a way to weld the heavy steel parts used on a Gilmore rotary grinder. I tried a lot of other ideas, and I had no luck. With a new welder, I was finally able to give it a go, and it works great! Here is a quick video
I am going to eventually mount it up higher with an angled hardware cloth chute to sort out the fines. It runs on a 1/2 hp motor that only draws about 130 watts when unloaded -didnt check it while it was grinding, but it should run on my charcoal generator without any trouble.
Here are some other posts with videos of similar grinders:
Anyone that I missed who has a video of a grinder in action, please post it here!