I've always wanted a 4 axis machine but previously dismissed the idea assuming it would be far too complicated. However, recently I've been giving it some thought and it doesnt seem so difficult at all. My idea goes somthing along the lines of getting a 4th gecko drive, hooking that up to a 4th servo motor/encoder and then connecting that to a home built rotatry table consisting of some precision worm gears and bearings.
What I'd love to know from people who have already built or attempted to build a machine with a 4th axis is if my idea has a chance of working, or have a missed out a lot/over simplified things too much ?
Also if anyone has got some photos of their 4th axis setups i'd like to see them.