To obtain the second-class technician certificate of CNC milling machine workers, you must first have the title of technician. Now that the relevant papers have been published, plus a certain number of years, it is relatively more difficult for senior CNC technicians to take the exam than engineers and senior engineers.

CNC milling machine workers are people who are engaged in compiling CNC machining programs and operating CNC milling machines to mill parts. This occupation is divided into four grades, namely intermediate (national vocational qualification level 4), advanced (national vocational qualification level 3), technician (national vocational qualification level 2) and senior technician (national vocational qualification level 1).