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Chapter 5
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Chapter 5

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  1. Print handouts Select File, Print Edit the following selections to read: Select the OK button Chapter 5 Multiview Sketching & Projection

  2. Orthographic Projection • A system of drawing views of an object using

  3. Six Standard Views • Front • Usually shows most • If applicable – should show object in operating condition (I.e. car)

  4. View Placement • Front view usually shows the most detail Projection Lines • Why must views be arranged so that they align?

  5. Revolving an Object to Produce the Six Basic Views

  6. The Glass Box Metaphor • Imagine that the object you are going to draw is positioned inside a glass box, so that the large flat surfaces of the object are parallel to the walls of the box. • From each pointon the object, imagine a ray, or projector perpendicular to the wall of the box forming the view of the object on that wall or projection plane. • 2 horizontal planes ( views) • 2 frontal planes ( views) • 2 profile planes ( views)

  7. Projection of an Object

  8. Projection of an Object

  9. Unfolding the Glass box • For • Imagine that the walls of the box are hinged and unfold the views outward around the front view. • This will give you the standard arrangement of views for

  10. Glass Box Method

  11. DEMO • If a point, line or plane is in one view, it must be in all the views.

  12. Exercise • Sketch Block_1 together • Need • HB pencil • Engineering Calculation Paper • Model • Access instructions (www) • eetsg27.bd.psu/~holidar • Sketch the border & title block • Sketch the object full scale • Center the views inside the border • Label • Views – TOP, FRONT, etc. • Size Description – dimensioning • Block_2 • Sketch, full scale, 6 views, label appropriately, & dimension

  13. Chapter 5 Multiview Sketching & Projection Part 2

  14. Necessary Views • A sketch or drawing should only contain the views needed to clearly and completely describe the object. Choose the views that show the . One view drawing of a shim One view drawing of a connecting rod

  15. 3 Views - Most Common Three views necessary? Which view could be eliminated?

  16. Transferring Dimensions • Mitered System • Dividers or Scale

  17. Mitered System • Draw miter line at 45 degrees at a convenient distance to produce the desired view.

  18. Mitered System cont’d. 2 1 3 4 • Project additional points, surface by surface. 1 1 3

  19. Mitered System cont’d. 2 1 8 7 6 3 5 4 • Project additional points, surface by surface.

  20. Mitered System cont’d. 2 1 8 7 6 3 5 4 • Draw the view locating each vertex of the surface on the projection and miter line.

  21. Dividers or Scale • With folding lines • Without folding lines

  22. Hidden Lines

  23. Exericse • Block_3 • Sketch, full scale, 6 views • Label appropriately • Dimension • Block_4 • Sketch 3 views • Do NOT label the views • Dimension

  24. Chapter 5 Multiview Sketching & Projection Part 3

  25. Review Hidden Lines

  26. Surface Identification

  27. View Identification

  28. Configuration Rule INCLINDED PLANES EDGE EDGE

  29. EDGE TS EDGE NORMAL PLANE Configuration Rule OBLIQUE PLANE ? PLANE EDGE

  30. Configuration Rule ? PLANE • Is this one correct?

  31. Points, Lines & Planes • If all else fails, • Break the object down to simpler shapes • Locate the height, width and depth of each point.

  32. Exercise

  33. Exercise • Sketch 3 views and dimension Blocks_5 - 20

  34. Chapter 5 Multiview Sketching & Projection Part 4

  35. Center Lines

  36. Center Lines HOW MANY CENTER LINES MISTAKES?

  37. Center Lines • ¼” past the end of the hole and/or cylinder End of cylinder End of hole

  38. Precedence of Lines HIDDEN LINES TAKE PRECEDENCE OVER OBJECT LINES TAKE PRECEDENCE OVER

  39. Center Lines

  40. Projection of an Object POOR PRACTICE PREFFERED

  41. Projection of an Object POOR PRACTICE PREFFERED PRACTICE

  42. Exercise • Sketch 3 views and dimension Blocks_21 - 29