How to generete pcb drilling file from protel to convert to gcode for drilling with cnc router running mach3. used for small industri pcb manufacture, pcb is already etched (silkscreen)
Excellon drill file format is similar to but not identical to G-code format.
There are a couple freeware software lackages which take excellon format and convert to G-code suitable for cnc drilling .
I am sorry I do not have a link to hand but if you do a search for excellon to g code converter I am sure you will find them.
The other option is to write ( or have it done for you ) a small program to read in excellon drill file and convert to G-code. Both excellon format and g-code are ascii human readable formats.