[tocs3]

Tools can sometimes be interesting enough in them selves to justify learning about just the tool. Not disagreeing with the comment just adding my take.

I bought a little CNC machine years ago. I just wanted to learn a little more. Then started looking around for projects that might make a little money, more just to know if there are "profitable" projects I could do with it (mildly successful).

As for the original question, start with simple (an alarm clock that tells you why you need to get up?) and build up from there. I would like to hear if you come up with something. Good luck.