It was an exercise in creativity. A proof of concept. Granted it would have to be slowed down by a factor of 100. But I bet he could do it! I've been wielding for 40 years. Is. It practical? Probably not. But it is Skookum as Frig!
The 4 1/2" grinder is the next step up the tool evolution ladder. It's only limited by your imagination. Necessary is the mother of invention. Great job!!