Computer Added Design - Assignment Help

Global exchange of information required that the format of CAD/CAM have a common set of tools, using a neutral standard for transferring information across heterogeneous systems. This drastically reduces the requirement for translators.

To improve the control over the various exchange process and to reduce the number of necessary converters one may use CAD transfer standards. Well known standards include IGES, DXF and STEP. An interface can be regarded as an aggregate of conditions, rules and conventions which defined the information exchange between two communicating objects. The language or user interface is the window through which the user can communicate with the CAD module.

GKS is one standard interface. It defines a language independent nucleus for operating a graphic system. IGES is concerned with the exchange of product description data. This exchange takes place via a neutral data format. IGES has versions 1.0 to 5.0. A regular up gradation of the interfaces is required for solving the problems faced in the previous versions. Once IGES being used extensively, its weaknesses were identified which eventually led to a new standard called PDDI, developed through the Air force ICAM programme. The purpose of PDDI was to develop a mechanism to allow complete exchange or sharing of product model data directly among computer application without human intervention.

For standards based on a broader automation goal a new discipline of information modelling, i.e. PDES was developed.

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