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GE 121 – Engineering Design - 2009 Engineering Design GE121 SECTION VIEWS Drawing and Sketching (Continued) Lecture 13B.

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Presentation on theme: "GE 121 – Engineering Design - 2009 Engineering Design GE121 SECTION VIEWS Drawing and Sketching (Continued) Lecture 13B."— Presentation transcript:

1 GE 121 – Engineering Design Engineering Design GE121 SECTION VIEWS Drawing and Sketching (Continued) Lecture 13B

2 GE 121 – Engineering Design Sections  Sections are views of surfaces exposed by cutting planes

3 GE 121 – Engineering Design Conic Section Different sections are created by varying the angle of the cutting plane. CircleEllipseParabolaHyperbola

4 GE 121 – Engineering Design Mechanical Drawing Section

5 GE 121 – Engineering Design Assembly Drawing

6 GE 121 – Engineering Design Construction Detail Sections

7 GE 121 – Engineering Design Topographic Maps

8 GE 121 – Engineering Design Topographic Sections

9 GE 121 – Engineering Design Topographic Sections (on Mars)

10 GE 121 – Engineering Design Wireframe Sections

11 GE 121 – Engineering Design 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 GE 121 – Engineering Design 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 GE 121 – Engineering Design Section Views in Engineering Sketches

14 GE 121 – Engineering Design Section Views in Engineering Sketches Normal Orthographic View Section View Section View can replace one of the normal orthographic views, or it could be drawn as a separate view

15 GE 121 – Engineering Design 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 GE 121 – Engineering Design Section Views in Engineering Sketches Hidden lines used to avoid an additional view

17 GE 121 – Engineering Design 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 GE 121 – Engineering Design Section Views in Engineering Sketches

19 GE 121 – Engineering Design Section Views in Engineering Sketches Two Cutting Plane Line - Formats

20 GE 121 – Engineering Design 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 GE 121 – Engineering Design Section Views in Engineering Sketches Hatching symbol can be used to convey information about the material of the object.

22 GE 121 – Engineering Design Section Views in Engineering Sketches More hatching symbols

23 GE 121 – Engineering Design Section Views in Engineering Sketches Section lines are omitted around notes and dimensions

24 GE 121 – Engineering Design Section Views in Engineering Sketches  Full Section  Cutting plane passes through the object in one continuous line

25 GE 121 – Engineering Design 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 GE 121 – Engineering Design 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 GE 121 – Engineering Design 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 GE 121 – Engineering Design Section Views in Engineering Sketches

29 GE 121 – Engineering Design Section Views in Engineering Sketches  Change of angle of the cutting plane line is NOT shown in the section view

30 GE 121 – Engineering Design Section Views in Engineering Sketches  On multi-part assemblies, change the angle of hatching or hatching material symbol to identify different parts

31 GE 121 – Engineering Design 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 GE 121 – Engineering Design Activity: Sketch Section Front View Right Side View

33 GE 121 – Engineering Design Activity: Sketch Section Top View Front View

34 GE 121 – Engineering Design Activity: Sketch Isometrics  Sketch Isometric Views of the Objects in the previous examples as time permits


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