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Solid Modeling

Solid Modeling. Lecture 12. Getting Started with 3-D CAD by Solid Modeling. Goals 3-D CAD models developed from primitive solids Reference – Chap 11 – 3-D Geometry Concepts BTG CADKEY 99 – Chapter 6 AutoCAD 2002 Tutorial – 3-D Modeling – Chapter 6. Agenda.

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Solid Modeling

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  1. Solid Modeling Lecture 12 Autumn Quarter

  2. Getting Started with 3-D CAD by Solid Modeling Goals • 3-D CAD models developed from primitive solids Reference – • Chap 11 – 3-D Geometry Concepts BTG • CADKEY 99 – Chapter 6 • AutoCAD 2002 Tutorial – 3-D Modeling – Chapter 6 Autumn Quarter

  3. Agenda • Understand basic ways to generate 3-D solid models • Create solid models from primitive shapes – usage of Solids99 or AutoCAD functions and features • Derive shapes using Boolean functions • Modify solids using fillets and chamfer • Use Drawing Layout Mode Autumn Quarter

  4. Review of important concepts in CAD • CAD model is a “virtual” part • A 3-D CAD model stores the entire 3-D shape of the object • 3-D models can be generated from 2-D profiles by using CAD programs Autumn Quarter

  5. Approaches to developing a solid model • Constructive solid or primitive modeling • Constraint-based modeling • Feature-based modeling Autumn Quarter

  6. Primitive Modeling - combine simple shapes Autumn Quarter

  7. Constraint-based solids modeling • Part roughed in • Constrained or detailed by adding dimensions • 3-D Objects created by revolving or extruding Autumn Quarter

  8. Constraint-based solids modeling – by revolving Autumn Quarter

  9. Constraint-based solids modeling – by extruding Autumn Quarter

  10. Feature-based Modeling • Creating and modifying geometric features of a solid model like a manufacturing process. Autumn Quarter

  11. Example of Feature-based process Autumn Quarter

  12. How Solids Models Can Be Used • Improve efficiency in design by visualization and virtual assembly • Link to Numerical Analysis • Stress • Heat Transfer Analysis • Fluid Flow • Link to Computer-aided Manufacturing Autumn Quarter

  13. Using CADKEY 99 and AutoCAD 2002 as 3-D Programs • Chapter 6 introduces some of the basic techniques for creating 3-D geometry • Basic models are initially built from primitive shapes – modified to create more complex objects • A CADKEY 3-D blank seed drawing or AutoCAD 4-viewport template would serve as the basis for 3-D solids modeling Autumn Quarter

  14. Creating Layout Mode drawings • Even if the model is built with a 3D construction approach, conventional orthographic views with dimensioning and in some cases sectioning will be needed. • CADKEY Chapter 6 demonstrates how to create layout mode drawings, starting with a 3D model. • AutoCAD Chapters 6 and 7 show modeling, Chapter 8 shows the layout. • Procedures and conventions for dimensioning will be covered later Autumn Quarter

  15. Creating Layout Mode drawings • CADKEY and AutoCAD have two system modes - Model mode and Layout mode. • CADKEY and AutoCAD distinguish between the two so that you can create part files in Model mode, then switch to Layout mode to create different layouts of the part file and detail them for drafting purposes. • In Model mode you can take advantage of all the CADKEY and AutoCAD functions to create and edit part files. Model mode is the default system mode that you enter when you start CADKEY and AutoCAD. • Layout mode is a drafting tool that you use to create, dimension and then print or plot Autumn Quarter

  16. Example Problem from CADKEY Autumn Quarter

  17. Review Questions • What are the views listed in the four view port option? • What is the difference between View and WLD coordinates? Autumn Quarter

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