CNC


Computer-control programmers and operators use computer numerically controlled (CNC) machines to cut and shape precision products, such as automobile parts, machine parts, and compressors. CNC machines include machining tools such as lathes, multiaxis spindles, milling machines, and electrical discharge machines (EDM), but the functions formerly performed by human operators are performed by a computer-control module. CNC machines cut away material from a solid block of metal, plastic, or glass—known as a workpiece—to form a finished part. Computer-control programmers and operators normally produce large quantities of one part, although they may produce small batches or one-of-a-kind items. They use their knowledge of the working properties of metals and their skill with CNC programming to design and carry out the operations needed to make machined products that meet precise specifications.

After the programming work is completed, CNC operators—also referred to as computer-controlled machine tool operators, metal and plastic—perform the necessary machining operations. The CNC operators transfer the commands from the server to the CNC control module using a computer network link or floppy disk. Many advanced control modules are conversational, meaning that they ask the operator a series of questions about the nature of the task. CNC operators position the metal stock on the CNC machine tool—spindle, lathe, milling machine, or other—set the controls, and let the computer make the cuts. Heavier objects may be loaded with the assistance of other workers, autoloaders, a crane, or a forklift. During the machining process, computer-control operators constantly monitor the readouts from the CNC control module, checking to see if any problems exist. Machine tools have unique characteristics, which can be problematic. During a machining operation, the operator modifies the cutting program to account for any problems encountered. Unique, modified CNC programs are saved for every different machine that performs a task.

Job Outlook and Growth Potential:

Computer-control programmers and operators should have excellent job opportunities. Due to the limited number of people entering training programs, employers are expected to continue to have difficulty finding workers with the necessary skills and knowledge. Employment of computer-controlled machine tool operators is projected to grow more slowly than the average for all occupations through 2012, but employment of numerical tool and process control programmers is expected to grow about as fast as the average for all occupations through 2012. Job growth in both occupations will be driven by the increasing use of CNC machine tools. Advances in CNC machine tools and manufacturing technology will further automate production, boosting CNC operator productivity and limiting employment growth. The demand for computer-control programmers will be negatively affected by the increasing use of software that automatically translates part and product designs into CNC machine tool instructions.

Wages and Earnings Potential:

Median hourly earnings of computer-controlled machine tool operators, metal and plastic, were $13.97 in 2002. The middle 50 percent earned between $11.07 and $17.43. The lowest 10 percent earned less than $9.14, whereas the top 10 percent earned more than $21.27. Median hourly earnings in the manufacturing industries employing the largest numbers of computer-controlled machine tool operators, metal and plastic, in 2002 were:

Metalworking machinery manufacturing $15.97
Other fabricated metal product manufacturing $15.14
Machine shops; turned product; and screw, nut, and bolt manufacturing $13.82
Motor vehicle parts manufacturing $13.08
Plastics product manufacturing $11.00


Copyright © 2014, Ohio's 2-Year Council of Deans and Directors of Engineering & Industrial Technologies

Career information from Bureau of Labor Statistics, U.S. Department of Labor,
Occupational Outlook Handbook, 2004-05 Edition and member schools.