PCB on Gcode Mill

The roland MDX-15/20 does RML1... not gcode. The sherline and other mills do G-code.

There are a few ways to generate Gcode with eagle: PCB-gcode, the Mill script

Install PCB-gcode. 

Copy the Dimension board outline to the Milling layer.

run the pcb-gcode-setup.ulp

important values to check:

Machine: Feedrates, Z Axis

Gcode Style, Select EMC (linuxCNC), or Generic if you not sure.

Accept and make my board, or Accept and then run the pcb-gcode.ulp