looking good. have you spun up the ac servos yet? i bet they are smooth. What drive ratio are you planning on using? Are you going to get ballscrews or just stick with the standard leadscrews and use backlash compensation?
Already have some 25x5 ballscrews left over from the router project that got scraped so I will just use these... Will also double nut them with a preload on the 2nd nut for automatic adjustment. Havn't made a decision on the ratio yet. But will be some where around 2:1 or 3:1 or somewhere in between.
Havn't fired the servos up yet... Waiting to get the control cabinet so can I wire everything up...
The thrust bearings are completely unnecessary. The whole point of using A/C bearings is that they handle both radial and axial loads. And do NOT use bellevilles to pre-load bearings. Either the pre-load will be so high that you'll have high friction, and reduced bearing life, or so low that the bellevilles compress further under load and you have backlash. The pre-load should be provided by shimming or some other rigid means of adjustment. Also, the A/C bearings must face opposite each other.