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Chapter 5 Pictorial Projection

Chapter 5 Pictorial Projection. Explain the difference between axonometric and oblique projection. Explain the difference between isometric projection and isometric sketch (or draw ). Create an isometric and oblique sketches from an actual object and given multiview drawing.

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Chapter 5 Pictorial Projection

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  1. Chapter 5 Pictorial Projection

  2. Explainthe difference between axonometric and oblique projection. Explainthe difference between isometric projection and isometric sketch (or draw). Create an isometric and oblique sketches from an actual objectand given multiview drawing. Objectives After completing this chapter, the students will be able to

  3. Topics • Pictorial projections • Axonometric • Oblique Isometric sketch Oblique sketch

  4. Pictorial Projections

  5. B A D A C A B Line of sight Line of sight A B B C D C C D D Pictorial Projection Axonometric Projection Oblique Projection Parallel & normal to picture plane Parallel & oblique to picture plane

  6. B A D C B Line of sight A D C Axonometric Projection

  7. a b c B A a D c C b B a A c b D C Axonometric Projection Type of axonometric drawing Axonometric axis 1. Isometric All angles are equal. Axonometric axis Two angles are equal. 2. Dimetric Axonometric axis None of angles are equal. 3. Trimetric

  8. A A Line of sight B B C C D D Oblique Projection

  9. 45o 60o A 30o B C B A D D C Full scale Half scale 45o 45o Oblique Projection Oblique drawing angle Type of Oblique drawing 2) Cabinet 1) Cavalier

  10. Isometric projection vs. Isometric sketch

  11. Isometric Projection Rotate 45 about vertical axis Tilt forward (35o16’) All edges foreshorten about 0.8 time.

  12. Forshorten Full scale Isometric sketch Isometric sketch is an isometric view that is drawn in full size. Isometric drawing (Full size) Isometric projection (True projection)

  13. Orientation of Isometric Axes Isometric axes can be arbitrarily oriented to create different views of a single object. Regular isometric Reverse axis isometric Long axis isometric View point is looking down on the top of the object. View point is looking from the right (or left) of the object. View point is looking up on the bottom of the object.

  14. True-length distances show along isometric lines. Isometric line is the line that run parallel to any of the isometric axes. Distance in Isometric Sketch Nonisometric lines Isometric axes

  15. Isometric Sketching

  16. Sketch from an actual object 1. Place the object in the position which its shape and features are clearly seen. 2. Define an isometric axis. 3. Sketching the enclosing box (or cylinder). 4. Estimate the size an and relationship of each details. 5. Darken all visible lines.

  17. Sketch from an actual object STEPS 1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines.

  18. In isometric sketch/drawing), hidden lines are omittedunless they are absolutely necessary. Note Sketch from an actual object STEPS 1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines.

  19. Sketch from multiview drawing 1. Interprete the meaning of lines/areas in multiview drawing. 2. Locate the lines or surfaces relative to isometric axis.

  20. Top H Top View Front Side W D Front View Side View H Side D Front Bottom View W Bottom Example 1 : Object has only normal surfaces Regular Reverse

  21. D Nonisometric line q y H y x Front View x W Example 2 : Object has inclined surfaces

  22. x C y E A D F B Front View B D C A E F Example 4 Regular Reverse

  23. In isometric drawing, a circle appears as an ellipse. Isometric ellipse Sketching Steps 1. Locate the center of an ellipse. 2. Construct an isometric square. 3. Sketch arcs that connect the tangent points.

  24. Four-centermethod is usually used when drawn an isometric ellipse with drawing instrument. Isometric ellipse Sketching Steps 1. Locate the center of an ellipse. 2. Construct an isometric square. 3. Construct a perpendicular bisector from each tangent point. 4. Locate the four centers. 5. Draw the arcs with these centers and tangent to isometric square.

  25. Example 5

  26. Irregular Curve in Isometric Steps 1. Construct points along the curve in multiview drawing. 2. Locate these points in the isometric view. 3. Sketch the connecting lines.

  27. Oblique Sketching

  28. Object Orientation Guidelines Complex features (arc, hole, irregular shape surface) are placed parallel to frontal plane.

  29. Object Orientation Guidelines The longest dimension of an object should be parallel to the frontal plane. GOOD GOOD WORSE WORSE

  30. Object Orientation Guidelines Which one is better ?

  31. D 45 Sketch from actual object ESTIMATE DEPTH ESTIMATE LINES

  32. Sketch from multiview drawing Example 1

  33. Sketch from multiview drawing Example 1

  34. E D C B A Sketch from multiview drawing Example 2

  35. Sketch from multiview drawing Example 2 E D C B A

  36. Sketch from multiview drawing Example 2 E D C B A

  37. Sketch from multiview drawing Example 2 E D C B A

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