thanks irving2008 for reply i appropriate your effort with me thanks again

Single ballscrew on that width isn't going to work,
2 ballscrew mean double cost what is the max width of gantry that work well with one

what is your opinion about the design of steel machine above

Inertia of 25mm screw is too high for a 2.8Nm motor
i pay this PS 70~90V with previous Nema23 3NM is this work also double 1610 with 1750 mm length work good or not?