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Drawing Section Views and Graphic Patterns

Drawing Section Views and Graphic Patterns. Sacramento City College EDT 310. Objectives. Identify sectioning techniques. Draw section material using the BHATCH, HATCH, and SOLID commands. Graphic Patterns. Many drawings use repetitive symbols or objects to describe specific information.

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Drawing Section Views and Graphic Patterns

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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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