thanks riving2008 silyavski for valuable information;

Nema 23 number is JK57HS112-3004


I have a limited option for stepper and PS choice, the available stepper are JK57HS112-3004 and JK86HS78-5504 to choose one of them (low cost for me)

Rotary ball nut is not available option in my country and also dust intensity in the air is a big problem for ball screw + high cost thus rack and pinion is easy to maintain specially with big 2400*1220*30 machine

I think the design of gantry with one box 100*100*3 may be reduce the weight

i have a limited time to choose one kit (nema23 425oz+60V PS) (nema34 651oz+60V PS)
what is the best ratio 2:1 or 3:1 or 5:1
thanks