Last Updated

31st August, 2002

Detailed CAD drawing

According to this project, UG (Unigraphics) is used as a parametric feature-based solid modelling system for creating and subsequent editing the detailed CAD drawings. Detailed design is the main stage of the design project to build detailed CAD drawings in Uni-Graphics after the conceptual hand sketches. All the detailed design is based on the conceptual ideas. The CAD drawings are 2-dimensional and 3-dimensional drawings. The 2-D drawings should have the main dimension and some of the tolerance. The 3-D drawings should have the wire-frame and solid modelling with the photo-realised image. In the Unigraphics, the real photo-realised images and simple animations are directly created. The materials and light can be assigned in the photo image that can make it real. The format of the image is tiff format and the format of the animation is the mpeg.

There are two assembly design processes:

1. Bottom up modelling approach
2. Top down modelling approach.

Bottom up modelling approach is to create the assembly by linking all the parts or components. The components are created separately and link them together into assembly. Components and assembly drawings are independent. It is the process in which the previously designed parts are added to an assembly. However, the top down modelling approach is to create the whole components from assembly. From the conceptual drawings, the assembly is created to whole components. It is the process in which a new component part is created while working in context of the assembly. Design in context is the process in which geometry is defined in one part to reference geometry in some other part. In this design project, both top-down and bottom up modelling approaches were built the design for assembly drawings. Top-down modelling (in the conceptual design) presupposes that will be designing in context and creating new parts relative to other components. Bottom up assembly modelling approach starts by identifying the lowest level piece parts that will make up the assembly. Component parts and sub-assemblies are created that move up the assembly level hierarchy.

The design of the components or sub-assemblies makes up the conceptual design through knowledge of materials and processes. A component design specification (CDS) is set along the lines of the PDS.

The conceptual 4 is selected to create the detailed CAD drawing

All dimensions are in millimetres (mm).

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