Angelo Bee's vise looks to be home built, and is by far the largest engraving vise I've ever seen. The actual clamping part appears to be an average size bench vise. Hard to believe that he isn't using some sort of auxiliary vise to hold smaller parts or screws. If the ball is a solid steel sphere, it has to weigh well over 100 lbs. I'm guessing the setscrews suspending it in the massive base are probably nylon or brass tipped Vlier pins.
It shouldn't move while cutting steel with a graver. The thing to worry about would be having the bench it is sitting on collapse. You could almost use that thing to engrave engine blocks.
