AD software can be divided based upon the technology used: . 2-D drawing. Its applications include, · mechanical part drawing · printed-circuit board design and layout · facilities layout · cartography . Basic 3-D drawing (such as wire-frame modelling) . Sculptured surfaces (such as surface modelling) | Computer Aided Design and Computer Aided Manufacturing Part-4 Computer Graphics-CAD Software CAD Software CAD software can be divided based upon the technology used: 1. 2-D drawing. Its applications include, · mechanical part drawing · printed-circuit board design and layout · facilities layout · cartography 2. Basic 3-D drawing (such as wire-frame modelling) 3. Sculptured surfaces (such as surface modelling) 4. 3-D solid modelling 5. Engineering analysis CAD Software Some of the commonly available functions provided by CAD software are: Picture manipulation: add, delete, and modify geometry and text. Display transformation: scaling, rotation, pan, zoom, and partial erasing. Drafting symbols: standard drafting symbols. Printing control: output device selection, configuration and control. Operator aid: screen menus, tablet overly, function keys. File management: create, delete, and merge picture files. Geometric Modeling Geometric modelling refers to a set of techniques . | Computer Aided Design and Computer Aided Manufacturing Part-4 Computer Graphics-CAD Software CAD Software CAD software can be divided based upon the technology used: 1. 2-D drawing. Its applications include, · mechanical part drawing · printed-circuit board design and layout · facilities layout · cartography 2. Basic 3-D drawing (such as wire-frame modelling) 3. Sculptured surfaces (such as surface modelling) 4. 3-D solid modelling 5. Engineering analysis CAD Software Some of the commonly available functions provided by CAD software are: Picture manipulation: add, delete, and modify geometry and text. Display transformation: scaling, rotation, pan, zoom, and partial erasing. Drafting symbols: standard drafting symbols. Printing control: output device selection, configuration and control. Operator aid: screen menus, tablet overly, function keys. File management: create, delete, and merge picture files. Geometric Modeling Geometric modelling refers to a set of techniques concerned mainly with developing efficient representations of geometric aspects of a design. Therefore, geometric modelling is a fundamental part of all CAD tools. Geometric modeling is the basic of many applications such as: Physical property calculations (such as mass). Mechanism analysis. Finite-element modelling. NC programming. Requirements of geometric modelling include: Completeness of the part representation. The modelling method should be easy to use by designers. Rendering capabilities (which means how fast the entities can be accessed and displayed by the computer). Geometric Modeling Approaches The basic geometric modelling approaches available to designers on CAD/CAM systems are: 2D CAD modeling Wire-frame modeling. Surface modeling. Solid modeling. 2D CAD Modeling Wire-frame Modeling Wire-frame modelling uses points and curves (. lines, circles, arcs), and so forth to define objects. The user uses edges and vertices of the part to form a 3-D object Wire-frame model part
