Reza, there are no measurements so I can't make a definitive statement but generally, make sure you have the 8mm screws under tension or you'll end up with a lot of whip when going any reasonable speed. I use 16mm ball screw on my 1500x1500 machine and I have a little whip on high speed movements.
thank you for your comment and informations the 8mm lead screw just for z axis can change with ball screw system but for X & Y i think about rack and pinon drive or ball screw drive system . last nigh i change many parts if ican upload for tonight thank you so much