3-Axis CNC Mill Project

[Hobgoblin]

If I am driving my X axis with two 16mm diameter x 10mm pitch screws via a belt and pulleys, do i use a 1:1 ratio? so the pullys on the screws and motor each have for example, 40 teeth?

[Jonathan]

Yes, for the vast majority of things 1:1 is the best choice to get good speed and acceleration with 10mm pitch screws. There may be occasions when you need to use 1:2 (e.g. motor 15:screw 10), but it would need to be something very detailed to warrant that. Also there's no need to use such a large pulley, it will only increase the inertia of the system and reduce your acceleration as a result. 30T is a good choice since then you can use 1:2, in addition to 1:1, without having to use very small pulley.