Hi NordicCnc,
I have been investigating the motion model incorperating rotational and linear momentum and I am beginning to think that my calculations
may be overly optimistic. I have a pro engineer, and forum member reviewing my calculation.

At this time I suspect because I've elected to use such a large ballscrew (32mm diameter) that the rotational inertia dominates the linear inertia.
I suspect that you will have much less difficulty by virtue of using 20mm diameter screws with very much lower first moment of inertia.

The prices for the Delta servos are good. I paid about the same but excluding shipping, and shipping was about $80USD each to New Zealand.

Craig