Sectionsرسم

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Sectionsرسم

  1. 1. Section Views
  2. 2. PURPOSES OF SECTION VIEWSClarify the views by reducing or eliminating the hidden lines. revealing the cross sectional’s shape.Facilitate the dimensioning. Let See the example
  3. 3. EXAMPLE : Advantage of using a section view.
  4. 4. Terminology andcommon practices
  5. 5. CUTTING PLANECutting plane is a plane that imaginarily cutsthe object to reveal the internal features.Cuttingplane Cutting plane line Section lines
  6. 6. CUTTING PLANE LINECutting plane line is an edge view of the cuttingplane. Indicate the path of cutting plane.
  7. 7. CUTTING PLANE LINESTYLES Thick line ANSI Viewingstandard direction Thick line Viewing directionJIS & ISO Thin line standard This course Viewing direction
  8. 8. SECTION LININGSection lines or cross-hatch lines are used toindicate the surfaces that are cut by the cuttingplane. Section lines Drawn with 4H pencil.
  9. 9. SECTION LINES SYMBOLS The section lines are different for each of material’s type. For practical purpose, the cast iron symbol is used most often for any materials.Cast iron, Steel Concrete Sand WoodMalleable iron
  10. 10. SECTION LINING PRACTICEThe spaces between lines may vary from 1.5 mmfor small sections to 3 mm for large sections. COMMON MISTAKE
  11. 11. SECTION LINING PRACTICEIt should not be drawn parallel or perpendicularto contour of the view. COMMON MISTAKE
  12. 12. Kinds of Sections
  13. 13. KIND OF SECTIONS1. Full section2. Offset section3. Half section4. Broken-out section5. Revolved section (aligned section)6. Removed section (detailed section)
  14. 14. FULL SECTION VIEWThe view is made by passing the straight cuttingplane completely through the part.
  15. 15. Full Sections  In Full Sections, one-half of the part is removed.  (Technically, the cutting plane may be placed anywhere, but it should always be placed where the most information can be depicted in the
  16. 16. • If the origin of theFull Sections section view is A A obvious to the reader of the drawing, the cutting plane is not considered necessary. • In this case, it is very clear where the SECTION A-A section view originated, so the
  17. 17. OFFSET SECTION VIEWThe view is made by passing the bended cuttingplane completely through the part. Do not show the edge views of the cutting plane.
  18. 18. OFFSET SECTION VIEW
  19. 19. OFFSET SECTION VIEW
  20. 20. OFFSET SECTION VIEW D D
  21. 21. OFFSET SECTION VIEW D D
  22. 22. TREATMENT OF HIDDEN LINES Hidden lines are normally omitted from section views.
  23. 23. HALF SECTION VIEWThe view is made by passing the cutting plane halfwaythrough an object and remove a quarter of it.
  24. 24. HALF SECTION VIEWA center line is used to separate the sectioned halffrom the unsectioned half of the view.Hidden line is omitted in unsection half of the view.
  25. 25. HALF SECTION VIEW
  26. 26. HALF SECTION VIEW
  27. 27. BROKEN-OUT SECTION VIEWThe view is made by passing the cutting plane normalto the viewing direction and removing the portion of anobject in front of it.
  28. 28. BROKEN-OUT SECTION VIEWA break line is used to separatethe sectioned portion from theunsectioned portion of the view.Break line is a thin continuousline (4H) and is drawn freehand.There is no cutting plane line.
  29. 29. EXAMPLE : Comparison among several section techniques
  30. 30. REVOLVED SECTION VIEWRevolved sections show cross-sectionalfeatures of a part. No need for additional orthographicviews.This section is especially helpful when across-section varies.
  31. 31. REVOLVED SECTION VIEWBasic concept
  32. 32. REVOLVED SECTION VIEWBasic concept
  33. 33. REVOLVED SECTION VIEWSteps in constructionGiven Edge view of cross-sectionStep 1a. Assign position of cutting plane.b. Draw axis of rotation in front view.
  34. 34. REVOLVED SECTION VIEWSteps in constructionGivenStep 2a. Transfer the depth dimension to the front view.
  35. 35. REVOLVED SECTION VIEWSteps in constructionGivenStep 3a. Draw the revolved section.b. Add section lines.
  36. 36. REVOLVED SECTION VIEWSteps in constructionGiven FINAL PICTURE
  37. 37. REVOLVED SECTION VIEWPlacement of revolved section 1. Superimposed to orthographic view. 2. Break from orthographic view. Break Superimposed
  38. 38. REVOLVED SECTION VIEWPlacement of revolved section 1. Superimposed to orthographic view. 2. Break from orthographic view. Break Superimposed
  39. 39. REMOVED SECTION VIEW6. Removed section Removed section is revolved section. Section view is shown outside the view. Used where space does not enough for revolved section Can be located elsewhere on a drawing with properly labeled
  40. 40. REMOVED SECTION VIEW6. Removed section
  41. 41. REMOVED SECTION VIEW6. Removed section
  42. 42. REMOVED SECTION VIEWExample : Revolved vs. removed sections. Revolved section Removed section
  43. 43. REMOVED SECTION VIEWExample : Revolved vs. removed sections.
  44. 44. REMOVED SECTION VIEWExample : Situation that removed section is preferred. Poor Preferred Too messy !!
  45. 45. REMOVED SECTION VIEWExample : Multiple removed section views A B B A SECTION B – B SECTION A – A
  46. 46. REMOVED SECTION VIEWExample : Multiple removed section views No breaks
  47. 47. REMOVED SECTION VIEWExample : Multiple removed section views
  48. 48. Dimensioningin Section View
  49. 49. In most cases, dimensioning of the section viewsfollows the typical rules of dimensioning.POOR GOOD
  50. 50. DIMENSIONINGPOOR GOOD 10 10 φ 50 φ 50
  51. 51. DIMENSIONINGFor a half-section view,use dimension line withonly one arrowhead thatpoints to the position insidethe sectioned portion. φ 50

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