Would a water/air powered CNC machine be feasible?
This would allow the only parts needed to be inside the CNC machine to be made by a CNC or small electricaly driven control valves and maybe some potentiometers for position sensing.
I have noticed that most of the CNC plans that I see use stepper motors which if I understand right offer only 1 speed, but I do not really understand why.
Please tell me what you think. I have been looking at these "build your own CNC printer" and "build your own CNC mill" sites alot lately, but I have no clue yet when it comes to such things.