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Lecture 4: Multiple Views

Lecture 4: Multiple Views. Prepared by: Nor Helya Iman Kamaludin. Multiview Drawing. A multiview drawing is one that shows two or more two-dimensional views of a 3-D object . Multiview drawings provide the shape description of an object.

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Lecture 4: Multiple Views

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  1. Lecture 4: Multiple Views Prepared by: Nor HelyaImanKamaludin PTT 105/3: Engineering Graphics

  2. Multiview Drawing • A multiview drawing is one that shows two • or more two-dimensional views of a 3-D object. • Multiview drawingsprovide the shape • description of an object. • When combined with dimensions, • multiviewdrawings serve as the • main form of communication between • designers and manufacturers. PTT 105/3: Engineering Graphics

  3. Multiview Drawing PTT 105/3: Engineering Graphics

  4. Width, Depth, and Height • All three-dimensional objects have width, height, and depth. • Width is associated with an object’s side-to- • sidedimension. • Height is the measure of an object from top- • to- bottom. • Depth is associated with front-to-back • distance. PTT 105/3: Engineering Graphics

  5. Width, Depth, and Height PTT 105/3: Engineering Graphics

  6. Width, Depth, and Height 45° PTT 105/3: Engineering Graphics

  7. Orthographic Projection • Orthographic projection is a technique that is used to • create multiview drawings. • Orthographic projection is any • projection of the features of an • object onto an imaginary • plane of projection. • The projection of the features of • the object is made by lines of sight • that are perpendicular to the plane of projection. • The use of a 45° miter line and Projection Lines provide • a quick, accurate method of drawing PTT 105/3: Engineering Graphics

  8. Orthographic projection is the most commonly used drafting method because it describes shapes of objects completely and exactly PTT 105/3: Engineering Graphics

  9. Orthographic Projection The best way to understand orthographic projection is to imagine an object contained inside a glass box. PTT 105/3: Engineering Graphics

  10. Orthographic Projection • There is a total of six • glass walls surrounding • the object. • Each wall represents a • projection plane onto • which a two- dimensional • object view will be created. PTT 105/3: Engineering Graphics

  11. Projection Plane • A projection plane, also referred to as a • plane of projectionorpicture plane, is an • imaginary surface that exists between the • viewer and the object. • The projection plane is the surface onto • which a two-dimensional view of a three- • dimensional object is projected and created. PTT 105/3: Engineering Graphics

  12. Orthographic Projection • Start by focusing • only on the front • projection plane. • A person standing in • front of the object • would see only the • five corners identified • in black. 2 3 1 4 line of sight at 90° angle to projection plane 5 PTT 105/3: Engineering Graphics

  13. Orthographic Projection • Projection lines • are used to project • each corner outward • until they reach the • projection plane. PTT 105/3: Engineering Graphics

  14. Projection Lines • A projection line is an imaginary line that is • used to locate or project the corners, edges, • and features of a three-dimensional object onto • an imaginary two-dimensional surface. PTT 105/3: Engineering Graphics

  15. Orthographic Projection • The visible edges of • the object are then • identified on the • projection plane by • connecting the • projected corners • with object lines. PTT 105/3: Engineering Graphics

  16. Orthographic Projection • The orthographic • projectionprocess is • then repeated on the • other projection • planes. PTT 105/3: Engineering Graphics

  17. Sketching a Multiview Drawing • Sketching multiview • drawing can be easily • done using points, • construction lines, and • object lines. PTT 105/3: Engineering Graphics

  18. Sketching a Multiview Drawing Step #1: Calculate the amount of space that the views will take up. PTT 105/3: Engineering Graphics

  19. 12 spaces 18 spaces Calculating Required Space Overall Multiview Sketch Height? Overall Multiview Sketch Width? PTT 105/3: Engineering Graphics

  20. Sketching a Multiview Drawing Step #1: Calculate the amount of space that the views will take up. Step #2: Layout the boxes within which the individual views will occur using points and construction lines. PTT 105/3: Engineering Graphics

  21. Construction Line Layout PTT 105/3: Engineering Graphics

  22. Sketching a Multiview Drawing Step #1: Calculate the amount of space that the views will take up. Step #2: Layout the boxes within which the individual views will occur using points and construction lines. Step #3: Identify the visible edges by drawing object lines on top of the construction lines. PTT 105/3: Engineering Graphics

  23. Object Line Layout PTT 105/3: Engineering Graphics

  24. POP QUIZ!!! PTT 105/3: Engineering Graphics

  25. A Question… • Each of the blocks at right has the same overall dimensions and color. What else do they have in common? PTT 105/3: Engineering Graphics

  26. The Answer is… Each of the blocks at right has the same overall dimensions and color. What else do they have in common? They all have identical top views! PTT 105/3: Engineering Graphics

  27. PTT 105/3: Engineering Graphics

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