[macdowswe]

Well yes, I saw that video. However, I am wondering if it has been tried on a larger machine. A 3 kg mass on linear rails is still really nothing compared to what I am talking about. I'm considering trying it on my milling machine so I am talking more like a 40-50 pound mass moving vertically at at least 200 inches per minute. It is driven by a ball screw, but rides on dovetail slides which will have considerable more friction that linear rails. Has anyone attempted anything like this?

Ah fair enough. No, I haven't done anything like that. I don't think it will be a big issue though, as long as the gearing is well dimensioned.
Get a board, and try it ;D