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Unit 5 Multiview Drawings Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Define spatial.

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Presentation on theme: "Unit 5 Multiview Drawings Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Define spatial."— Presentation transcript:

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2 Unit 5 Multiview Drawings

3 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Define spatial visualization. Explain the relationship between an orthographic projection and a multiview drawing. Identify and define the three dimensions of an object. Define the six principal views and the three regular views. Identify the three principal projection planes.

4 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Explain three visualization principles for multiview drawings. Identify the three types of flat surfaces. Explain characteristics of cylindrical surfaces. Explain characteristics of fillets, rounds, and runouts. Identify differences between third-angle and first- angle projection. Discuss computer-generated views.

5 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. The Role of Spatial Skills Spatial visualization can be defined as the mental visualization of 2D and 3D shapes and objects, including such tasks as imagining objects in the mind as they are rotated, moved, or reflected in a mirror

6 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Spatial Visualization Tools Visualization of rotations

7 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Spatial Visualization Tools Mental rotation with two correct rotations

8 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Spatial Visualization Tools Surface development test

9 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Spatial Visualization Tools Mental visualization of folding and unfolding

10 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Orthographic Projection Created by projecting the points of a three- dimensional object onto a two-dimensional plane

11 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Multiview Projection Orthographic projection consisting of systematically arranged views to describe an object

12 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Definition Summary Orthographic projection, multiview projection, and multiview drawing are interchangeable terms Represents the main type of drawing views used in industrial prints

13 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Selection of Views Six principal views: –Front –Back –Top –Bottom –Right side –Left side

14 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Selection of Views Three “regular” views commonly used in education: –Front –Top –Right side

15 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Selection of Views

16 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensions of an Object Height is how tall the object is, as measured on the front view Width is how wide the object is, as measured on the front view Depth is how deep the object is from front to back Each dimension appears twice in the three regular views “Length” and “breadth” are terms not used

17 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensions of an Object

18 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Orientation Possibilities Perpendicular Parallel Inclined

19 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Projection Possibilities Edge view True size and shape Foreshortened shape

20 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Principal Planes of Projection Frontal plane Horizontal plane Profile plane

21 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Types of Flat Surfaces Normal

22 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Types of Flat Surfaces Inclined

23 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Three Types of Flat Surfaces Oblique

24 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cylindrical and Curved Surfaces

25 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Meanings of a Multiview Line A—Edge view of a flat or curved surface B—Intersection of two surfaces (just an edge) C—Maximum contour of a curved surface

26 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. First-Angle and Third-Angle Projection Dividing space into quadrants –Historical development of projection theory used two planes to divide space –After projections, the two planes are revolved into one, with quadrants two and four “collapsed”

27 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. First-Angle and Third-Angle Projection

28 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Third-Angle Projection Used in the United States

29 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. First-Angle Projection Used in Europe

30 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Computer-Generated Views The benefits of creating views directly from the 3D model include: –Ease of construction –Ease of change –Accuracy in representing geometry –Intelligent association between the model and the annotations

31 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Computer-Generated Views Views created by the CAD program may need: –Individual line adjustment for weight or dash spacing –The representation of fillets, rounds, and runouts adjusted (see A versus B to the right) –Conventional practices reviewed

32 Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. What do you see? Print supplied by Sunnen Products Company.


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