i listened to the second episode just now. my first thought was: "FINALLY!!!! some one started a podcast related to CNC."
i do have some notes about the production itself. these are my complaints about most podcasts in general.
distortion is bad, avoid it. i am assuming you are using some sort of digital production tools, once they distort, the sound quality dies very quickly. my second note is the judicious use of editing, there were some sections that sounded like they were dropped into the original audio stream in post production.
just my two cents.