ok. goin for a thiner screw would drastically reduce starting and stopping inertia and rotational mass! meaning that i dont have to go overboard with the motors! do you think a small 430oz-in NEMA23 gear say to 5:1 would move a Y axis of a 6ft (5ft effective) long table with say 16mm OD screw? this got me wondering because having studied joe's 4x4 CNC videos and pics, it look to me like he's using NEMA23 motors with a long screw, more friction than ball screw and his machine has a inch lead, and its surprising to see thats it flys!