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Blueprint Reading for the Machine Trades, Sixth Edition Unit 5: Orthographic Projection of Inclined Planes. Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach. Foreshortened Views. Inclined angles are at right angles to two of six principal views

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Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach


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  1. Blueprint Reading for the Machine Trades, Sixth Edition Unit 5: Orthographic Projection of Inclined Planes Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach

  2. Foreshortened Views • Inclined angles are at right angles to two of six principal views • Appears as an edge on those two views • Remaining views are foreshortened

  3. Foreshortened Views • Plane a appears as edge in top and bottom views • Foreshortened in other four-twice visible and twice hidden • Always study adjacent views to determine true shape

  4. Foreshortened Views • Line “E” is created by the edge of principal plane “V” • Both surfaces in the right hand view represent the true shape

  5. Foreshortened Views • Line “I” is created by the intersection of inclined plane “W” and the principal plane “X” • The right hand view represents one foreshortened and one true shape

  6. Foreshortened Views • No line is created when curved surface “Y” runs tangent with the principal plane “Z” • Combines foreshortening and true shape

  7. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #1. T

  8. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #2. E

  9. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #3. T

  10. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #4. E

  11. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #5. E

  12. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #6. T

  13. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #7. E

  14. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #8. T

  15. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #9. T

  16. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #10. T

  17. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #11. F

  18. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #12. I

  19. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #13. E

  20. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #14. T

  21. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #15. E

  22. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #16. I

  23. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #17. F

  24. Surface Identification 4 E: Edge view of surface I: Intersection of surfaces F: Foreshortened surface T: True shape Identify the condition for circle #18. T

  25. Surface Identification 5 L Enter the letters into the balloons. J H L B A D G F J D E A L K M C N

  26. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views.

  27. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. A B B D C

  28. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. B D E D A C

  29. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. B C C A D

  30. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. F A D E H C B G

  31. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. C A C B D E F

  32. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. E B C D A B

  33. Surface Identification 6 Place the letters from the pictorial views onto their respective surfaces in the orthographic views. B A B D E E C

  34. Angular Dimensions • Inclined planes dimensioned two ways • Coordinate method • Angular method • Angular method uses one linear and one angular dimension-allows variation to increase with distance from vertex • Coordinate controls accuracy more than angular

  35. Angular Dimensions • Most angular dimensions held from vertical or horizontal centerline • Easy to calculate other angle from 90 • All triangles have 180 

  36. Angular Dimensions • Right triangle always has 90 angle • Other two angles add up to 90 • 180 total in triangle

  37. Angular Dimensions • Isosceles triangle has 2 sides equal • Two angles are also equal

  38. Angular Dimensions • Equilateral triangle has three equal sides • Also has three equal angles

  39. Angular Dimensions

  40. Angular Dimensions

  41. Angular Block 1.Are the inclined planes dimensioned by the coordinate method or the angular method? Angular

  42. Angular Block 2. What is the tolerance assigned to the angular dimensions? 030’

  43. Angular Block 3. What is the tolerance on the liner dimensions? .020

  44. Angular Block 4. What type of line was drawn on the front and the top views to permit them to be shortened? Long Break

  45. Angular Block 5. How many hidden lines would appear on a bottom view? 1

  46. Angular Block 6. How many hidden lines would appear on a left side view? 0

  47. Angular Block 7. How many inclined planes does the object contain? 2

  48. Angular Block 8. How many principal planes does the object contain? 8

  49. Angular Block 9. How much tolerance accumulates with dimension “A?” .04

  50. Angular Block 10. What is the MMC of the overall height? 1.32