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BNG 101 – Engineering Graphics
Slide Set 2 – Drawing Views and Orthographic Projection I – Third Angle Projection
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Projections
• Behind every 2D drawing of an object is a space relationship involving the object and three “imagined” things: – The observer’s eye, or station point – The plane of projection – The projectors (also called visual rays or lines of sight)
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Projections
Parallel Projection (why?)
Perspective Projection
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Projections
What type of vision is “real life” (imagine looking at a long rectangular box)?
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Perspective Projection
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Perspective Projection
HW 1 Problem 1 – find an example of a three-point perspective drawing/photo from the web
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Projections
primarily concerned with these in this course
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Projections
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Projections
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Orthographic Projection
Drawing Views – General
• How many views are utilized in a drawing? – First use the six principal Orthographic views
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Glass Box and Six Orthographic Views
What happens if you unhinge and unfold the faces of the box around the front panel?
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Third Angle Projection (USA)
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First Angle Projection (Europe, Asia)
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Third Angle Projection
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Height, Width and Depth Dimensions
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Types of surfaces
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Projection of flat (normal) surfaces
Normal surfaces always appear as their true size in each view
Before doing some practice, some general points about drawing…
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Freehand Drawing
• In freehand, it is acceptable to not use special pencils or precisely follow the line weight rules
• However, use the following as a guide:
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Exercise 1
Draw the third angle front/top/right views for the following object (hash marks are spaced ¼ inch apart):
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Types of surfaces
What would the front and top view of this structure look like?
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Exercise 2
Look at the top view below and draw an object it could represent (I’ll do one for you)
A B
C
Top view
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Types of surfaces
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Projection of inclined surfaces
Inclined lines and surfaces are foreshortened on planes to which they are inclined
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Exercise 3
Draw the third angle front/top/right views for the following object (hash marks are spaced ¼ inch apart):
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Alphabet of lines
• Centerlines: Centerlines are thin, long and short dashes, alternately and evenly spaced, with long dashes placed at each end of line
• Centerlines are used to represent the axes of symmetrical parts of features, bolt circles, paths of motion, and pitch circles
• Every circle, and some arcs, should have two centerlines that intersect at their center of the short dashes – this is the centermark
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Exercise 4
Draw the third angle front/top/right views for the following object (hash marks are spaced ¼ inch apart):
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Exercise 5
Draw the third angle front/top/right views for the following object:
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Types of surfaces
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Projection of oblique surfaces
• Oblique surfaces: – Cannot appear as an edge in a standard view (not perpendicular to any
standard plane) – Will not appear as true size in any view
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Exercise 6
Draw the third angle front/top/right views for the following object (hash marks are ¼ inch):
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Exercise 7
Fill in the missing lines:
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Exercise 8
Fill in the missing lines:
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Exercise 9
Draw the missing (RIGHT) view:
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Exercise 10
Draw the missing (TOP) view:
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On your own…
• In addition to HW 1-1, try exercises 7 – 11 in Chapter 2 of the Planchard text
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Project Examples