My friends thanks a lot for your answers! My mommus cnc currently has an accuracy of + - 0.2mm. I want to use it for luthiery work and this accuracy is not very good! In advance i want i to cut a bigger surface so as to curve neck for guitars. At this momment i am thinking of a possible way to drive the gantry with only one motor but from the center (in some machines i have seen it ) i dont know buti have to ask is there any good modification to momus that will not need alot of extra work and also allow me to attach lead screws ?or ballscrews!~?