Computer Aided Design drawings

A 3D CAD (computer-aided design) drawing of a conic anisogrid lattice structure for aerospace application. ... 

Computer-aided design (CAD) solutions (drawing tools)... 

In most design offices Computer Aided Design (CAD) methods are now used to produce the drawings required for all the aspects of a project flow-sheets, piping and instrumentation, mechanical and civil work. 

A number of industiy-accepted state-of-the-art 3D computer-aided design (CAD) systems have been used for this purpose. The specification-driven 3D-CAD system allows a computer model to be built to allow extraction of drawings from the model for fabrication and erection. The extracted drawings are enhanced in their accuracy by the computer interference detection system which greatly reduces field rework. 

We consider first how to implement the refinement process itself, then how to draw the curve defined for a given scheme and a given initial polygon, and then how to compute the primitive operations used within, for example, a Computer Aided Design software system. 

The result is that whereas a truly accurate drawing is still a difficult aim in conventional Computer-Aided Design (CAD) applications, the drawing becomes one possible window on the data in such advanced systems. This clearly is a complex, expensive process and has only succeeded where an industry and its suppliers have agreed to cooperate in the development of the definitions. This transferability of information is essential to competitive survival in the car, oil and aircraft industries. Pharmaceutical companies are now beginning to follow suit. 

Stereolithography is a technique widely adopted in industry in conjunction with computer-aided design, CAD, and computer-aided manufacturing, CAM, i.e. micromachining [32, 37, 38]. Stereolithography allows the fabrication of solid, plastic, three-dimensional (3-D) prototypes or models of products and devices from CAD drawings in a matter of hours. Rapid prototyping by means of stereo-... 

Reverse Engineering (RE) is used to acquire the model geometry and shape when product drawings are not available and/or component details have been modified, typically for prototyping purposes. This approach is divided into an acquisition phase to obtain a measured point cloud, through the direct 3D digitizing of the object, and an elaboration phase to rebuild the Computer-Aided Design (CAD) and/or a Solid-to-Layer (STL) model. 

For the geometrical layout of a mold, CAD (Computer Aided Design) systems are available nowadays, with which an injection molding tool cannot only be described by two-dimensional drawings, but also shown as a complete 3-D model. The latter is of particular interest for the description of the often complex, shape-giving mold contours. The input for producing such a model... 

Computer-aided design (CAD) n. Using a computer, and appropriate programs (software), in the engineering design - even to the production of finished working drawings - of parts, tools, molds, and assemblies. 

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