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📄 Contents

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  1. Objectives
  2. Objectives
  3. Overview
  4. Overview
  5. Coordinates for 3D Cad Modeling
  6. Coordinates for 3D Cad Modeling
  7. Geometric Entities
  8. Geometric Entities
  9. 4.1 Manually Bisecting a Line or Circular Arc
  10. 4.1 Manually Bisecting a Line or Circular Arc
  11. 4.2 Drawing Tangents to Two Circles
  12. 4.2 Drawing Tangents to Two Circles
  13. 4.3 Drawing an Arc Tangent to a Line or Arc and through a Point
  14. 4.3 Drawing an Arc Tangent to a Line or Arc and through a Point
  15. 4.4 Bisecting an Angle
  16. 4.4 Bisecting an Angle
  17. 4.5 Drawing a Line through a Point and Parallel to a Line
  18. 4.5 Drawing a Line through a Point and Parallel to a Line
  19. 4.6 Drawing a Triangle with Sides Given
  20. 4.6 Drawing a Triangle with Sides Given
  21. 4.7 Drawing a Right Triangle with Hypotenuse and One Side Given
  22. 4.7 Drawing a Right Triangle with Hypotenuse and One Side Given
  23. 4.8 Laying Out an Angle
  24. 4.8 Laying Out an Angle
  25. 4.9 Drawing an Equilateral Triangle
  26. 4.9 Drawing an Equilateral Triangle
  27. 4.10 Polygons
  28. 4.10 Polygons
  29. 4.11 Drawing a Regular Pentagon
  30. 4.11 Drawing a Regular Pentagon
  31. 4.12 Drawing a Hexagon
  32. 4.12 Drawing a Hexagon
  33. 4.13 Ellipses
  34. 4.13 Ellipses
  35. 4.14 Spline Curves
  36. 4.14 Spline Curves
  37. 4.15 Geometric Relationships
  38. 4.15 Geometric Relationships
  39. 4.16 Solid Primitives
  40. 4.16 Solid Primitives
  41. 4.17 Recognizing Symmetry
  42. 4.17 Recognizing Symmetry
  43. 4.18 Extruded Forms
  44. 4.18 Extruded Forms
  45. 4.19 Revolved Forms
  46. 4.19 Revolved Forms
  47. 4.20 Irregular Surfaces
  48. 4.20 Irregular Surfaces
  49. 4.21 User Coordinate Systems
  50. 4.21 User Coordinate Systems
  51. 4.22 Transformations
  52. 4.22 Transformations
  53. Key Words
  54. Key Words
  55. Chapter Summary
  56. Chapter Summary
  57. Skills Summary
  58. Skills Summary
  59. Review Questions
  60. Review Questions
  61. Chapter Exercises
  62. Chapter Exercises
This chapter is from the book

This chapter is from the book

Technical Drawing with Engineering Graphics, 16th EditionTechnical Drawing with Engineering Graphics, 16th Edition

Learn More Buy

This chapter is from the book

This chapter is from the book

Technical Drawing with Engineering Graphics, 16th EditionTechnical Drawing with Engineering Graphics, 16th Edition

Learn More Buy

4.20 Irregular Surfaces

Not every object can be modeled using the basic geometric shapes explored in this chapter. Irregular surfaces are those that cannot be unfolded or unrolled to lie in a flat plane. Solids that have irregular or warped surfaces cannot be created merely by extrusion or revolution. These irregular surfaces are created using surface modeling techniques. Spline curves are frequently the building blocks of the irregular surfaces found on car and snowmobile bodies, molded exterior parts, aircraft, and other (usually exterior) surfaces of common objects, such as an ergonomic mouse. An example of an irregular surface is shown in Figure 4.74. You will learn more about modeling irregular surfaces in Chapter 5.

f0152-03.jpg

4.74 Irregular Surfaces

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