OK, thanks

Well.. doing some research for my timelapse track project I foud this:



I think this answers me a lot of questions... Now I'll start to hunt the materials. I received this morning the Arduino controller and did some tests controlling a stepper motor (from an old scanner), a DC motor (with PWM) and a hobby servo (not modified yet)

I got the 1m rail & bearings, but it's too heavy for the timelapse track. I'll leave it for the X-axis of my CNC table ;)