CADCA系统毕业论文外文翻译.doc

附录A：文献翻译原文 Chapter 1 CNC/CAM WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor. 1.1 CAD/CAM Systems This topic is an introduction to CAD/CAM systems, components, and applications. 1.1.1 Background CAD/CAM is an acronym for Computer Aided Design / Computer Aided Manufacturing. In essence CAD is simply a drafting board in a computer and facilitates engineering and design with a monitor and a keyboard instead of a paper and pencil. The drawing is saved in an electronic data file for editing. CAM is what can be done with the electronic data to help manufacture the engineered part represented in the electronic file. Although there can be hundreds of different manufacturing processes (stamping, forging, molding, etc) “CAM” when teamed with “CAD” as in “CAD/CAM” has come to refer almost exclusively as the process of machining the CAD geometry on CNC machinery. Of course the computer file alone cannot machine a part nor can the computer. But with a CAD/CAM system the electronic CAD file can be used to create another file of tool paths that can be fed into the controls of the CNC machinery.In the 60s and 70s CAD/CAM systems were comprised of expensive mainframe computers and minicomputers. Because of rapid advancements in computer technology, the personal computer (PC) is now being used for most systems. 1.1.2 CAD/CAM? System Components (The PC based CAD/CAM system and peripheral) A typical PC-based CAD/CAM system begins with a personal computer. This computer should have enough power and memory and must be properly configured to effectively run the software .An input device or two will also be required. Normally this would consist of a mouse and a keyboard. Output devices are also needed such as a printer or