hi,
I'm building a robot, and it's clear for me (now) how to make something rotate with servos, but I'd need to make something translating precisely to make my bot playing guitar, so I need its "left hand" move along. I don't know how to do it , because if I use a continuous rotation servo, I can't control it accurately(I mean: the position)... or am I wrong...

...
thanx
manu