Yeah, defently acceleration issue, speed isn't much of an issue when max travel is 700mm:-) But i'd like to get as much as the system can, hence the idea of using aluminium for the subtable...
The ballscrew is a 32mm with 10mm pitch. The servo is 2,2kW with 7Nm continuously, but 300% overload possible for bursts(like acceleration), so 21Nm max(if we ignore the cutoff at high RPM)... I've actually struggled a lot to determin if the sizing was correct :-/ But i've made the design around the ballscrews so there is physical room to go up one framesize of servos in case my current one isn't enough, then the next limit will be the powerline to my house ;-)