Milling like you're talking about has largely been replaced by CNC. The set-up time for a manual system just kills it for 1 or 2. The memory in a CNC is just a matter of pushing a button and locating "home". That's a matter of minutes for an experienced CNC hand. Think an hour or two for manual set-up. Any electronic rotary table/dividing device would need to be linked, either with wireless or with wire, so that rotation would begin the moment the X axis was engaged. Feed rate of X would need to be linked to rotation speed, meaning the motor on the rotating device would need to be variable speed. If the feed rate of X was increased or decreased, rotation would have to respond accordingly, or the flutes would not be symmetrical. You could always take the new mill and add ball screws and a CNC control with 4th axis capability. Centroid makes an easy to use conversion. I have cut straight flutes on CNC and manual vertical mills, and manual horizonal mills. Deflection has always been a concern, and I have supported the barrel to keep that deflection to a minimum. Seems to me that any deflection of the work from the tool would induce stress. Just my 'nickels' worth..........
