Some months ago I posted a picture of a gantry that I came across. It had platforms you could walk on high up on the "rails". And not far away from it on the ground was a (8-jaw if I remember correctly) chuck that you could park a car on. Maybe 4m in diameter. I believe it was actually the 4th axis for the gantry as there was a similarly-sized hole in the ground underneath the gantry.
The servos on that thing were roughly the size of your household washing machine. |