I'm a recruiter in the area of CNC and general manufacturing. I wondered if anyone would be able to recommend some books that I can buy to get a better understanding of the whole CNC process?

I'm conducting interviews for my clients and want to be able to ask in-depth questions in order to make sure I can tell the difference between an okay engineer and a great one. I already have rudimentary knowledge and understand where each person/job role fits in the process of manufacture, now it's about understanding how to interview at the next level up.

Any help is greatly appreciated!

Gillies