Howard,
A few more details are needed. Only you know what you have, EAGLE and cnc is a bit sparse. How about a photo or two of the CNC machine, make and model, servo controller make & model, and user computer to be used for user interface. In these types of arrangements the servo controller is a central component. Some are Arduino based, others ARM, a few use custom processors, although lately a few folks are using the UK based RaspBerry Pi as the 'brians' with a hat that is either a pin breakout board or has integrated servo/stepper motor drivers, etc. I am not a CNC guy myself, but I made a homebrew delta 3D printer. In the communities where I hang my hat, there are several groups that are cnc makers and these are the things I've seen posted. Between the controller and the User Computer is another peice of software which takes the tool path code file and squirts it into the controller which converts the commands into electrical control signals.
So provide some info, and people will help you. A photo of the CNC and the make and model, along with the controller info is a good start. Good Luck...
walt
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SETV - Autonomous Instrumentation Platforms for the Detection & Measurement of Suspected ExtraTerrestrial Objects
