INTRODUCTION TO CAD AND CAM
Throughout the history of our industrial society, many inventions have been patented and whole new technologies have evolved. Perhaps the single development that has impacted manufacturing more quickly and significantly than any previous technology is the digital computer. Computers are being used increasingly for both design and detailing of engineering components in the drawing office.
CAD CAM DEFINITION
Computer aided design(CAD) is defined as the application of computers and graphics software to aid or enhance the product design from conceptualization to documentation. CAD is most commonly associated with the use of an interactive computer graphics system, referred to as a CAD system. Computer aided design systems are powerful tools and in the mechanical design and geometric modelling of products and components.
There are several good reasons for using a CAD system to support the engineering design function:
✓ To increase the productivity
✓ To improve the quality of the design
✓ To uniform design standards
✓ To create a manufacturing data base
✓ To eliminate inaccuracies caused by hand copying of drawings and inconsistency between drawings
Computer-aided manufacturing (CAM) is defined as the effective use computer technology in manufacturing planning and control. CAM is most closely associated with functions in manufacturing engineering, such as process and production planning, machining, scheduling, management, quality control, and numerical control (NC) part programming.
Computer-aided design and computer-aided manufacturing are often combined CAD/CAM systems. This combination allows the transfer of information from the design into the stage of planning for the manufacturing of a product, without the need to re-enter the data on part geometry manually. The database developed during CAD is stored, then it is processed further, by CAM, into the necessary data and instructions for operating and controlling production machinery, material handling equipment, and automated testing and inspection for product quality. In general, a Computer Aided Design (CAD) package has three components:
b. Analysis and
A brief description of these components follows.
Design refers to geometric modeling, i.e., 2-D and 3-D modeling, including, drafting, part creation, creation of drawings with various views of the part, assemblies of the parts, etc.
Analysis refers to finite element analysis, optimization, and other number crunching engineering analyses. In general, a geometric model is first created and then the model is analyzed for loads, stresses, moment of inertia, and volume, etc.
Visualization refers to computer graphics, which includes: rendering a model, creation of pie charts, contour plots, shading a model, sizing, animation, etc.
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