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Engineering Design GE121

Engineering Design GE121. SECTION VIEWS Drawing and Sketching (Continued) Lecture 13B. Sections. Sections are views of surfaces exposed by cutting planes. Conic Section. Different sections are created by varying the angle of the cutting plane. Circle Ellipse Parabola Hyperbola.

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Engineering Design GE121

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  1. Engineering DesignGE121 SECTION VIEWS Drawing and Sketching (Continued) Lecture 13B

  2. Sections • Sections are views of surfaces exposed by cutting planes

  3. Conic Section Different sections are created by varying the angle of the cutting plane. Circle Ellipse Parabola Hyperbola

  4. Mechanical Drawing Section

  5. Assembly Drawing

  6. Construction Detail Sections

  7. Topographic Maps

  8. Topographic Sections

  9. Topographic Sections(on Mars)

  10. Wireframe Sections

  11. Section Views in Engineering Sketches • Improve clarity and reveal interior features of parts • Eliminate (or greatly reduce) hidden lines so sketches are more easily visualized and understood • The following section views images are taken from:Bertoline(1999): Introduction to Graphics for Engineers, McGraw-Hill

  12. Section Views in Engineering Sketches • Based upon the use of a cutting plane that cuts through the object to reveal interior surfaces Line of Sight Imaginary Cutting Plane

  13. Section Views in Engineering Sketches

  14. Section Views in Engineering Sketches Normal Orthographic ViewSection View Section View can replace one of the normal orthographic views, or it could be drawn as a separate view

  15. Section Views in Engineering Sketches • Ideally the objective is to eliminate all the hidden lines on the section, but it’s not always possible

  16. Section Views in Engineering Sketches Hidden lines used to avoid an additional view

  17. Section Views in Engineering Sketches • Cutting plane is indicated as an edge view in one of the orthographic views (cutting plane line) • Labeled • Thick line (0.6mm), dashed line, which extends beyond the edge of the object & terminates with arrowhead at 90° to the cutting plane • Two types of dashed lines • Arrowheads indicate the direction of view or line of sight

  18. Section Views in Engineering Sketches

  19. Section Views in Engineering Sketches Two Cutting Plane Line - Formats

  20. Section Views in Engineering Sketches • All surfaces touched (cut) by the cutting plane are marked with cross hatching or a special hatching symbol • Generic hatch pattern is normally at 45° unless object edges are at 45 (never want hatching to be parallel or perpendicular to object edges. If necessary, change angle of hatch to avoid this)

  21. Section Views in Engineering Sketches Hatching symbol can be used to convey information about the material of the object.

  22. Section Views in Engineering Sketches More hatching symbols

  23. Section Views in Engineering Sketches Section lines are omitted around notes and dimensions

  24. Section Views in Engineering Sketches • Full Section • Cutting plane passes through the object in one continuous line

  25. Section Views in Engineering Sketches • Half Section • Cutting plane passes only half way through the object, then takes a 90° turn • Generally for symmetrical objects

  26. Section Views in Engineering Sketches • Hidden lines ideally omitted on both halves of the section view • The sectioned and unsectioned portions are separated with a centreline • Cutting plane uses one arrowhead only

  27. Section Views in Engineering Sketches • Offset Section • Cutting plane line which is bent at 90° angles at one or more locations in order to pass through important features

  28. Section Views in Engineering Sketches

  29. Section Views in Engineering Sketches • Change of angle of the cutting plane line is NOT shown in the section view

  30. Section Views in Engineering Sketches • On multi-part assemblies, change the angle of hatching or hatching material symbol to identify different parts

  31. Section Views in Engineering Sketches • Sketching and Drawing • Sketching is a less-exact freehand operation, and straightedges are not generally used • Drawing is more precise, and uses straightedges, and precise dimensions and angles

  32. Activity: Sketch Section Front View Right Side View

  33. Activity: Sketch Section Top View Front View

  34. Activity: Sketch Isometrics • Sketch Isometric Views of the Objects in the previous examples as time permits

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