1. 1 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Engi 1504 – Graphics Lecture 9: l Special Topic 2 – Introduction to Solids Modelling l Take home assignment

2. 2 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Solids Modelling l There are three ways to represent 3-D shapes –Wireframe –Surface –True solid

3. 3 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Solids Modelling l Wireframe Model –Shows only the edges and no surfaces shown –No distinction between front and back –The inside is ‘empty’ –Fast and simplified

4. 4 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Solids Modelling l Surface Model –Shows only the surface and edges –The inside is still ‘empty’ –No hidden lines, so no confusion

5. 5 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Solids Modelling l Solids Model –Shows the surfaces and edges –Includes interior details –Includes information about the material

6. 6 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made l Extrusion l Sweeping l Revolving

7. 7 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made cont. l Extrusion – specify a cross-sectional area and a path

8. 8 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made cont. l Sweeping – refers to extrusion along a curved path

9. 9 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made cont. l Sweeping a ramp in Rhino © –create the helical path –create cross-section –Sweep along the path (choose roadlike - top)

10. 10 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made cont. l Render the ramp http://www.cadinfo.net/reviews/rhino.htm

11. 11 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland How Simple Solids are Made cont. l Revolving – revolve an area around an axis

12. 12 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Dave, will we ever use this crap? Simulation of Waterjet propulsion using CFD and Windtunnel tests

13. 13 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Rapid Prototyping

14. 14 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Rapid Prototyping

15. 15 SheetCourse: Engineering Graphics 1504Memorial University of Newfoundland Class Assignment l Read chapter 9 in the text l Choose a simple household object and model it as a solid l Submit a rendered picture of the object next class l For each class, the student with the best submission (in my opinion) will receive an extra 2 marks towards their final mark l Note: can download rhino3d for 20 saves at: http://www.rhino3d.com/cad.htm