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Mastering Drawing Section Views

Learn sectioning techniques, graphic patterns, and cutting-plane lines in drafting. Explore AutoCAD commands and how to draw internal features effectively for engineering projects.

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Mastering Drawing Section Views

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  1. Drawing Section ViewsandGraphic Patterns Sacramento City College EDT 310 EDT 310 - Drawing Section Views and Graphic Pattersn

  2. Objectives • Identify sectioning techniques. • Draw section material using the BHATCH, HATCH, and SOLID commands. EDT 310 - Drawing Section Views and Graphic Pattersn

  3. Graphic Patterns • Many drawings use repetitive symbols or objects to describe specific information. • Example, • The front elevation of the house shown in Figure 21-1 contains patterns of lines that create graphic representations of siding, brick, and roof materials. EDT 310 - Drawing Section Views and Graphic Pattersn

  4. Graphic Patterns EDT 310 - Drawing Section Views and Graphic Pattersn

  5. Graphic Patterns • The patterned arrangement of the objects of a symbol is known as a graphic pattern. • AutoCAD commands • BHATCH and SOLID can be used to draw graphic patterns quickly. EDT 310 - Drawing Section Views and Graphic Pattersn

  6. Section Views • One of the most common graphic patterns is a group of section lines added to a section view. EDT 310 - Drawing Section Views and Graphic Pattersn

  7. Sectioning and Section Views EDT 310 - Drawing Section Views and Graphic Pattersn

  8. Sectioning and Section Views • In mechanical drafting, internal features in multi-views appear as hiddenlines. • It is poor practice to dimension to hidden lines, • But these features must be dimensioned. • Section views are used instead, to clarify the hidden features. EDT 310 - Drawing Section Views and Graphic Pattersn

  9. Sectioning and Section Views • A Section view shows internal features as if a portion of the object is cut away. • Section views are used with multi-views to completely describe the exterior and interior features of an object. EDT 310 - Drawing Section Views and Graphic Pattersn

  10. Section Views/Cutting Plane Lines • When sections are drawn, a cutting-planeline is placed in one of the views to show where the cut was made. • The cutting-plane line is the saw that cuts through the object to expose internal features. EDT 310 - Drawing Section Views and Graphic Pattersn

  11. Cutting-Plane “Knife” EDT 310 - Drawing Section Views and Graphic Pattersn

  12. Section Views/Cutting Plane Lines • Cutting Plane lines have two forms: • A thick hidden (evenly spaced dashed) line. • A phantom line in accordance with ASME Y14.2M. A A A A EDT 310 - Drawing Section Views and Graphic Pattersn

  13. Section Views/Cutting Plane Lines • The arrows on the cutting-plane line indicate the direction of sight when looking at the section view. A A EDT 310 - Drawing Section Views and Graphic Pattersn

  14. Section Views/Cutting Plane Lines • The cutting-plane lines are labeled with letters that relate to the proper section view. • The section name, SECTION A-A, is placed under the view. EDT 310 - Drawing Section Views and Graphic Pattersn

  15. Normal Views Top View Isometric Pictorial View Front View Right Side View EDT 310 - Drawing Section Views and Graphic Pattersn

  16. Cutting-Plane Section View EDT 310 - Drawing Section Views and Graphic Pattersn

  17. Section Views/Cutting Plane Lines • The arrows on the cutting-plane line indicate the line of sight when looking at the section view. Section A-A EDT 310 - Drawing Section Views and Graphic Pattersn

  18. Section Views/Cutting Plane Lines • The cutting-plane lines are labeled with letters that relate to the proper section view. • SECTION A-A, is placed under the view. A A Section A-A EDT 310 - Drawing Section Views and Graphic Pattersn

  19. Section Views/Cutting Plane Lines • When more than one section view is drawn, labels continue with B-B through Z-Z. EDT 310 - Drawing Section Views and Graphic Pattersn

  20. EDT 310 - Drawing Section Views and Graphic Pattersn

  21. EDT 310 - Drawing Section Views and Graphic Pattersn

  22. Section Line Rules EDT 310 - Drawing Section Views and Graphic Pattersn

  23. Section Line Rules • 1. Section lines are placedat45o unless another angle is required to satisfy the next two rules. • 2. Avoid section lines placed at angles greater than 75o or less than 15o degrees from horizontal. EDT 310 - Drawing Section Views and Graphic Pattersn

  24. Section Line Rules • 3. Section lines should notbe drawn parallel or perpendicular to any other adjacent lines on the drawing. • 4. Section lines are NEVER drawn parallelto or atrightangles to visible lines. • Refer to Figure 9-8 EDT 310 - Drawing Section Views and Graphic Pattersn

  25. Section Lines/Object Lines Figure 9-8 EDT 310 - Drawing Section Views and Graphic Pattersn

  26. Section Lines/Object Lines Figure 9-8 EDT 310 - Drawing Section Views and Graphic Pattersn

  27. Section Lines/Object Lines Figure 9-8 EDT 310 - Drawing Section Views and Graphic Pattersn

  28. Section Line Rules • 3. Section lines should notcrossobjectlines. EDT 310 - Drawing Section Views and Graphic Pattersn

  29. Types of Sectional Views EDT 310 - Drawing Section Views and Graphic Pattersn

  30. Types of Sectional Views • Types of Sections: • Full Sections. • Offset Sections. • Half Sections. • Broken-Out Sections. • Revolved Sections. • Removed Sections. • Auxiliary Sections. • Phantom (Hidden) Sections. EDT 310 - Drawing Section Views and Graphic Pattersn

  31. Full Sections EDT 310 - Drawing Section Views and Graphic Pattersn

  32. Full Sections • A full section is a sectional view that shows an object as if it were cutcompletelyapart from oneend or side to the other. • Full sections remove half the object. • In full sections, the cutting-plane linepasses completely through the object along a center plane. EDT 310 - Drawing Section Views and Graphic Pattersn

  33. Full Sections • These views are sometimes just called sections. EDT 310 - Drawing Section Views and Graphic Pattersn

  34. Front View EDT 310 - Drawing Section Views and Graphic Pattersn

  35. Full Section EDT 310 - Drawing Section Views and Graphic Pattersn

  36. Full Sections • The two most common types of full sections are • vertical and • profile sections. • Refer to Figures 9-17 and 9-18. EDT 310 - Drawing Section Views and Graphic Pattersn

  37. Vertical Section EDT 310 - Drawing Section Views and Graphic Pattersn

  38. Profile Section EDT 310 - Drawing Section Views and Graphic Pattersn

  39. Sectioning • Sectioning is also used in other drafting fields, such as architectural and structural drafting. • Cross sections through buildings show the construction methods and materials. EDT 310 - Drawing Section Views and Graphic Pattersn

  40. EDT 310 - Drawing Section Views and Graphic Pattersn

  41. EDT 310 - Drawing Section Views and Graphic Pattersn

  42. Offset Sections EDT 310 - Drawing Section Views and Graphic Pattersn

  43. Offset Sections • Offset sections are almost the same as full sections, • Difference: the cutting-plane line is staggered. • The line cuts through features that are not in a straight line. EDT 310 - Drawing Section Views and Graphic Pattersn

  44. Offset Section - Figure 9-19 EDT 310 - Drawing Section Views and Graphic Pattersn

  45. EDT 310 - Drawing Section Views and Graphic Pattersn

  46. Offset Section EDT 310 - Drawing Section Views and Graphic Pattersn

  47. Half Sections EDT 310 - Drawing Section Views and Graphic Pattersn

  48. Half Sections • A half section is one half of a full section. • Half sections show one-quarter of the object removed. • The term half section is used because • Half of the view appears in section. • The other half is shown as an exterior view. EDT 310 - Drawing Section Views and Graphic Pattersn

  49. Half Section EDT 310 - Drawing Section Views and Graphic Pattersn

  50. Half Sections • Half sections are commonly used on symmetrical objects. • Both the inside and outside can be shown in one view. EDT 310 - Drawing Section Views and Graphic Pattersn

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