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Sketching in the Engineering Design Process

Learn the importance of sketching in engineering design and how to make simple sketches of basic shapes. Explore 3D coordinate systems, draw isometric and oblique sketches, and develop advanced sketching skills for complex objects.

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Sketching in the Engineering Design Process

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  1. Chapter 2 Sketching

  2. Objectives Explain the importance of sketching in the engineering design process. Make simple sketches of basic shapes such as lines, circles, and ellipses.

  3. Objectives Use 3-D coordinate systems, particularly right-handed systems. Draw simple isometric sketches from coded plans.

  4. Objectives Make simple oblique pictorial sketches. Use advanced sketching skills for complex objects.

  5. Sketching in the Engineering Design Process A sketch is any drawing made without the use of drawing instruments

  6. Sketching in the Engineering Design Process • "Engineer-to-engineer" graphic assist in a verbal explanation • Compromise between time and clarity • Used where a lot of control exists • Etcheverry Hall Model Shop

  7. Sketching in theEngineering Design Process Quickly prepared Simply constructed Used to improve spatial reasoning ability

  8. Sketching Lines Light, brisk strokes to establish lines Let inertia of the arm assist, don't over emphasize finger control Eyes away from paper, use peripheral vision

  9. Sketching Lines Use destination points for sighting Rotate the paper to assist line sketching

  10. Sketching Lines

  11. Sketching Lines • Start by creating light short • lines in one pass • Next make a second pass • to darken the lines

  12. Sketching Curved Entities Establish boundary lines Establish crossing points Establish tangent points and angles Use light stokes, then fill in

  13. Sketching Curved Entities

  14. Sketching Curved Entities

  15. Objects • 3-D is best way to communicate • Make the foundation: • The view to best represent • Space it occupies

  16. Objects • Add the frame: • The object outline • Finish the product: • Small details, texture • Amount depends on purpose

  17. Construction Lines Light lines used as a guide to create an object Used to outline the shape of the object that is being sketched Can be used to locate the center of holes

  18. Construction Lines

  19. Construction Lines

  20. Construction Lines

  21. Coordinate Systems • 3-D coordinate system • Represents space by three mutually perpendicular coordinate axes • Typically the x-, y-, and z-axes

  22. Coordinate Systems

  23. Right-Hand Rule

  24. Right-Hand Rule

  25. Isometric Paper • Used to help create isometric sketches • Isometric dots paper • Oriented such that the lines are already drawn at 120°

  26. Isometric Paper

  27. Isometric Sketches of Simple Objects

  28. Isometric Sketches of Simple Objects

  29. Circles in Isometric Sketches

  30. Circles in Isometric Sketches

  31. Circles in Isometric Sketches

  32. Circular Holes in Isometric Sketches

  33. Circular Holes in Isometric Sketches

  34. Oblique Pictorials Another type of sketch you can create to show a 3-D object Usually preferred for freehand sketching because of a specialized grid

  35. Oblique Pictorials Three dimensions of the object are shown with the height and width of the object in the plane of the paper. The third dimension (depth) is receding off at an angle from the others.

  36. Oblique Pictorials

  37. Circular Holes in Oblique Pictorial Sketches When circular holes appear in an oblique pictorial sketch, as with isometric sketches, you show the partial edges of the back circle where they are visible through the hole.

  38. Circular Holes in Oblique Pictorial Sketches

  39. Shading and Other Special Effects Shading can be used to improve the quality of your pictorial sketches. Another common use of shading is to show curvature of a surface.

  40. Shading and Other Special Effects

  41. Sketching Complex Objects

  42. Sketching Complex Objects

  43. Simple Isometric Sketches

  44. Simple Isometric Sketches

  45. Simple Isometric Sketches

  46. Simple Isometric Sketches

  47. Simple Isometric Sketches

  48. Oblique Sketches

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