Orthographic Projection 2 Dimensional View of an object Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

ME20/Tech20 – Engineering Design Graphics Graphics Theory Geometry and projection techniques. Visualization Ability to mentally process 3D information. Drawing rules and industry practices. Standards & Conventions Computer-Aided-Design (CAD) software (2D & 3D) .AutoCAD (2D) and Pro/E (3D) Tools Mechanical, Structural, Electrical, Architectural and Art & Design, Industrial Design, ….. Applications Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Different Viewpoint Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Parallel Projection Parallel Perspective Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Orthographic Projection Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Standard 2D views Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Standard Views of Primitive Solids Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU View Orientation Good orientation Poor orientation Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU View Selection Select the most descriptive views Use minimum number of views to describe the object Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Conventional Practices Holes, Ribs & Webs – Principle of Revolution Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Conventional Practices Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Conventional Practices - Intersections Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Miter Lines Miter lines are used to transfer depth information. 45o line drawn from point O O Standard multiviews Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Homework #1 – Due Friday 9/8 multiviews Problems 6, 26, 47, and 57 – page 276-280 (5th edition) page 269-272 (4th edition) page 364 (3rd edition) Freehand sketch the three standard views (front, top, and right side). Select the left side of the 3D drawing as the front view. Sketch 2 problems per page. Drawings should be somewhat proportional. Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Conventional Practices - Tangency Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Fillets, Rounds & Chamfers Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Top view Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Edge Lines – Principal & Inclined Principal lines appear vertical, horizontal or as point views. Inclined lines appear inclined in one view. 2 Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Edge Lines – Oblique Oblique line appears inclined in all views Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Principal Planes Principle planes are parallel to principal orthographic planes Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Inclined Planes Inclined planes are perpendicular to two opposite orthographic planes. Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Oblique Planes Oblique planes are neither parallel nor perpendicular to any principal orthographic planes. Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Type of Planes Oblique Inclined Principal Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Mechanical and Aerospace Engineering Dept., SJSU Edge View of a Plane Principal planes appear in true size in one plane and as an edge view in the other two planes. Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU

Homework #2 – Due Friday 9/22/06 Pictorials 4th edition – page 369-374, 5th edition – page 376-381 freehand sketches, two drawings per page 1) Figure 7.61 – draw a perspective view, choose a vanishing point at the upper right hand corner 2) Problem 14 – draw an oblique view. 3) Problems 4, 22, and 27 – draw an isometric view, looking down, the left , side of the isometric should be the front view. Ken Youssefi Mechanical and Aerospace Engineering Dept., SJSU