CNC MILLING MACHINE OPERATION : Intermediate (Book with DVD) (Workbook Included)

CNC Milling Machine Operation: Intermediate comprehends various diverse practical and visual skills with knowledge of specialized materials and techniques. CNC milling is a specific form of computer numerical controlled (CNC) machining. Milling itself is a machining process similar to both drilling and cutting, and able to achieve many of the operations performed by cutting and drilling machines. Like drilling, milling uses a rotating cylindrical cutting tool. However, the cutter in a milling machine is able to move along multiple axes, and can create a variety of shapes, slots and holes. In addition, the work-piece is often moved across the milling tool in different directions, unlike the single axis motion of a drill. This book will introduce the knowledge and skills for those studying and/or working in CNC machining industry to interpret and convey information in response to workplace requirements.

About this Book

The information in this book consists of basic to core competencies that a person must achieve to write basic CNC milling machine program, set-up machine, work piece and cutting tools and perform basic CNC milling machine operations.

About the CNC Machining Industry

A computer numerical control (CNC) machinist runs computer-operated equipment to create machine parts, tools and other mass-produced items. He or she may work in a machine shop or in the manufacturing industry as an expert in the installation, maintenance, programming and operation of CNC technology. CNC milling devices are the most widely used type of CNC machine. Typically, they are grouped by the number of axes on which they operate, which are labeled with various letters. X and Y designate horizontal movement of the work-piece (forward-and-back and side-to-side on a flat plane). Z represents vertical, or up-and-down, movement, while W represents diagonal movement across a vertical plane. Most machines offer from 3 to 5 axes, providing performance along at least the X, Y and Z axes. Advanced machines, such as 5-axis milling centers, require CAM programming for optimal performance due to the incredibly complex geometries involved in the machining process. These devices are extremely useful because they are able to produce shapes that would be nearly impossible using manual tooling methods. Most CNC milling machines also integrate a device for pumping cutting fluid to the cutting tool during machining. Entry-level operators load materials, such as blocks of titanium, steel, aluminum, or plastic, into CNC machines to be shaped. They calculate the amount of material to be fed into the machine, and make adjustments to the operating speed based on vibrations and sounds that may indicate a malfunction. Upon completion, an operator inspects the fabricated part to make sure that it matches specifications. Operators are responsible for cleaning and maintaining equipment, and often operate multiple machines. Experienced CNC set-up operators download control programs into individual machines and perform test operations to guarantee the machine properly creates the precise part. Set-up operators may work with a CNC programmer or modify the program directly before an entry-level operator takes over production. Individuals can learn skills through certificate or associate’s degree programs in machine or manufacturing technology. Relevant coursework covers blueprints, computer-aided design, machining principles, and metals. According to the U.S. Bureau of Labor Statistics, the median annual salary earned by computer-controlled machine tool operators for metals and plastic, including CNC lathe operators, was $35,900 as of May 2013.