I got the clifton 420 oz servos with 250 encoders. Im doing 4 axis on a 6 inch rotary table. The z axis will also be replaced with ball screws, Im going to remove the electronics control box and mount it on the wall then mount a servo behind the mill near the top of the z axis. This way I can run a belt right to the ball screw and not have to run through the rack and peanut gear. I will most likely take that gear off but im going to wait and see if it needs to be messed with.
As for the ball nuts, im doing the preload by using 2 nuts locked together as some of the other guys have done.
So far I have manually milled the x axis servo and ball screw set up. Im going to mill the rest of the axis's before I start swapping them out. My goal is to not modify the mill it self at all, fabricating all now mounting blocks and plates for the ballscrews. That way if I mess up I can put the lead screws back on with no problems. As you can see in the photo above in my last post the plate is the same shape as the exsisting plate only thicker and taller to accept the servo mount. I have not installed the press bearings yet, but there are thrust bearings in the plate.
