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Chapter 13

Chapter 13. Orthographic Sketching. Describing an Angle Bracket. Orthographic Projection. Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner. Orthographic Views.

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Chapter 13

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  1. Chapter 13 Orthographic Sketching

  2. Describing an Angle Bracket

  3. Orthographic Projection • Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner.

  4. Orthographic Views • You can adequately describe most objects with three orthographic views. • Front • Top • Right

  5. Converting to Orthographic

  6. Orthographic Views –Line Types

  7. Line Types Visible Line Hidden Line Center Line Dimension Line Construction Line

  8. Line Types

  9. Sketching Techniques

  10. Engineering Drawing Skills • Lettering • Line Types • Orthographic Views • Patience See the example drawings in the notes.

  11. Engineering Drawing Rules • Always use a Pencil. • Make all lettering the same size. • Use Engineering or Drafting Paper.

  12. Orthographic Views • You can adequately describe most objects with three orthographic views. • Front • Top • Right

  13. Sketching techniques • Use very light construction lines • “Box in” the rough outline of the object • Darken only the lines you wish to keep • Clean up the edges and rough spots

  14. Orthographic Projection • 2 Dimensional projections on Orthogonal planes • Show lines based on change of plane or change of material • Use multiple linetypes • Visible • Hidden • Center

  15. Describing an Angle Bracket • A relatively simple object • Pictorial view may be difficult

  16. Glass Box concept • Envision the object surrounded in a glass box • Project the views out onto the pieces of glass • Each pane shows a 2D projection of the object

  17. Completed Orthographics

  18. Projection Planes • The three panes of glass represent the principal orthographic planes • Horizontal • Frontal • Profile • Each plane illustrates two of the principal dimensions: Height, Width, and Depth

  19. Class Exercise • As a team you have 3 minutes to discuss the following: • What dimensions are contained on each of the principal projection planes?

  20. The Glass Box Approach

  21. Orthographic Projection

  22. Opening the Box

  23. Final Views

  24. Six Orthographic Views

  25. Laying Out All Six Views

  26. Three Primary Views

  27. View Selection • If the object has an obvious top, then it must be the top view • Minimize the number of hidden lines • Use the most descriptive view as the front view • Conserve space by choosing the depth to be the smallest dimension

  28. Precedence of Lines

  29. Construction of Views • Must align orthographic views • Width appears in Top and Front • Height appears in Front and Side • Depth appears in Side and Top • Height and width project directly • Depth must be projected via a 45° angle

  30. Steps in Creating the Three-View Sketch

  31. Step 1 - Lightly Block Three Views Use very light lines for drawing in the construction lines

  32. Step 2 - Lightly Block Major Features

  33. Step 3 - Add Features, Use Miter Line

  34. Steps in Creating the Three-View SketchStep 4 - Add Final Lines

  35. Steps in Creating the Three-View SketchCompleted Sketch

  36. Think-Pair-Share • In the next 1 minute as an Individual • if you could ask a question . . . specifically what don’t you understand about today’s topic what would it be. [at least 3 items should be listed] • Now take 2 minutes • to merge your list with the person sitting next to you AND add 1 new item to the list • In the next 5 minutes • share the results with the other half of your team, delete questions that you can answer for each other, AND prioritize the remaining questions your list

  37. Team Exercise • Complete three orthographic views of the object shown on the next slide. • Include visible, hidden, and center lines where appropriate. • Use the grid paper in the back of your book or your engineering sketch pad. • You will be given 7 minutes.

  38. Object for exercise

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