Hi Lemo:

Thank you very much for your answer.
You are right. A former drawing plotter would be weak for manage a dremmel. I was thinking too in a Lego Mindstorm, but it´s the same.
The thing is that I really like this home-made devices.
I have seen (also for Burrman) a simply and cheap CNC device. Ideal for beginners.
http://www.youtube.com/watch?v=6drMZqmyXQc&NR=1

I think that it would be a nice start! :-)