1. Chapter 6 – Pictorial Sketching
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2. Chapter 6 – Pictorial Sketching

3. Projection Systems
Page 169

4. Multiview vs Axonometric Projection
Page 170, Figure 6.2

5. Overview
Previous discussion centered on multiview drawings -2D orthographic projections (Chap 5)
Focus now on pictorial drawings which look more like pictures than a multiview drawing (3D).
Easier to visualize design
Sometimes added to multiview drawing for clarification
Good for marketing, shows assembly, inspect fits, conceptual ideas
Not good for dimensioning/manufacturing (can’t show detail)

6. Exploded Isometric Assembly
Isometric drawings are frequently used to show how parts assemble as in this automobile power module.

7. Axonometric Projections
Page 154
We will focus on isometric sketching.
Note, all angles are equal, and all line segments are equal (cube)

8. Isometric Projection vs. Sketch
Page 155
Isometric projections are foreshortened because the object is tipped with respect to the viewing plane. Isometric sketches, or drawings, are not usually foreshortened because they still appear proportionate when showing the dimensions full size along isometric axis lines. It is easier just to sketch the full dimension.

9. Step by Step: Isometric Sketching
Page 156

10. Axis, Views and Dimensions
3D - Isometric
Axis?
Views?
Top
Top
Front
R Side
Front
R Side
2D - Orthographic

11. Axis, Views and Dimensions
3D - Isometric
Axis?
Views?
Top
Top
Front
R Side
Front
R Side
2D - Orthographic

12. Axis, Views and Dimensions
3D - Isometric
Axis?
Views?
Dimensions?
Top
Top
Depth H
Front
R Side
Width W D
Isometric Line
Isometric Plane
Height
Front
R Side
2D - Orthographic

13. Hidden Lines
Hidden lines are not usually shown in isometric sketches unless they are needed to show a feature that would be unclear.
Usually the orientation for the isometric drawing should be chosen so that hidden lines aren’t needed.
Holes are assumed to go completely through the object unless their depth is indicated with a note or with hidden lines.

14. Axis: 1st Position VS 2nd Position
1. Box in overall dimensions.
2. Which view is most descriptive? Sketch as much of it as you can.
Isometric Lines
Non-isometric Plane D
Isometric Plane
Non-isometric Line H W H W D
1st Position
2nd Position

15. Solid Modeling Demo
Pro/ENGINEER (planes)

16. Example
¼” GRID

17. Locating Features
Page 158
To locate a feature such as the upper block, make measurements from an existing corner as shown here.

18. Plotting Points 1. Number the plane you want to locate.
2. Number the plane in the other views.
3. Locate the plane in the isometric view point by point. 1
Point 1:
.5,
1.5, .5 4
0, 0, 0
2, 3, ,4
1, , 3
0, 0, 0
W, H, D
0, 0, 0

19. Plotting Points 1. Number the plane you want to locate.
2. Number the plane in the other views.
3. Locate the plane in the isometric view point by point. 2 1
Point 1:
.5, 1.5, .5 4
Point 2:
1.5,
1.5, .5
0, 0, 0
2, 3, , 1
1, , 3
0, 0, 0
0, 0, 0

20. Plotting Points 1. Number the plane you want to locate.
2. Number the plane in the other views. 3
3. Locate the plane in the isometric view point by point. 2 4 1
Point 1:
.5, 1.5, .5 4
Point 2:
1.5, 1.5, .5
Point 3:
1.5, 1.5, 1
Point 4:
.5, 1.5, 1
0, 0, 0
2, 3, , 1
1, , 3
0, 0, 0
0, 0, 0

21. Plotting Points 1. Number the plane you want to locate.
2. Number the plane in the other views. 3 4’
3. Locate the plane in the isometric view point by point. 2 1’ 4 1
Point 1:
.5, 1.5, .5 4
, 4’
Point 2:
1.5, 1.5, .5
Point 1’:
.5, 2, .5
, 1’
Point 4’:
.5, 2, 1
0, 0, 0
1’, 4’
2, 3, ,4
1, , 3
0, 0, 0
0, 0, 0

22. Plotting Points 1. Number the plane you want to locate.3’
2. Number the plane in the other views. 2’ 3 4’
3. Locate the plane in the isometric view point by point. 2 1’ 4 1
Point 1:
.5, 1.5, .5 4
, 3’
, 4’
Point 2:
1.5, 1.5, .5
Point 2’:
1.5, 2, .5
, 2’
, 1’
Point 3’:
1.5, 2, 1
0, 0, 0
2’, 3’
1’, 4’
2, 3, , 1
1, , 3
0, 0, 0
0, 0, 0

23. Plotting Points 1. Number the plane you want to locate.3’
2. Number the plane in the other views. 2’ 4’
3. Locate the plane in the isometric view point by point. 2 1’ 4 1
Point 1:
.5, 1.5, .5 4
, 3’
, 4’
Point 2:
1.5, 1.5, .5
Point 2’:
1.5, 2, .5
, 2’
, 1’
Point 3’:
1.5, 2, 1
0, 0, 0
2’, 3’
1’, 4’
2, 3, , 1
1, , 3
0, 0, 0
0, 0, 0

24. Plotting Points 1. Number points. 2. Locate axis (0,0,0) (W,H,D) 3’
3. Locate each point.
4. Connect points. 3 1’
5. Darken appropriate lines. 3’ 2’ 1’ 2’ 1 2 3 2 1
3, 3’
1, 1’
Point 1?
.75, 2, 0
Point 3?
2, 2’
1.5, 2, 0
Points
1,’, 2’, & 3’?
Point 2?
1.5, 1.25, 0

25. Plotting Points 1. Number points. 2. Locate axis (0,0,0) (W,H,D) 3’
3. Locate each point.
4. Connect points. 3 1’
5. Darken appropriate lines. 3’ 2’ 1’ 2’ 1 2 3 2 1
3, 3’
1, 1’
Point 1?
.75, 2, 0
Point 3?
2, 2’
2.25, 2, 0
Points
1,’, 2’, & 3’?
Point 2?
1.5, 1.25, 0

26. Inclined Surfaces in Isometric
Page 157
Inclined surfaces can not be measured along inclined lines in an isometric sketch. To locate inclined surfaces you must make measurements along the isometric axis lines.

27. Locating on a Non-isometric Plane
Locate the center of the circle.
Point 1 coordinates?
.5, , .75 1 1 1 1

28. Complete the Isometric
Point 1:
0, 0, .625
Point 2:
.625, .5, 1.375
Point 3:
.625, ..5, 625
Point 4:
0, 0, 3 2 4 1
2, 3
1, 4

29. Complete the Isometric
Point 1:
0, 0, .625
Point 2:
.625, .5, 1.375
Point 3:
.625, .5, 625
Point 4:
0, 0, 3 2 4 1
2, 3 4
1, 4

30. Sketching
Lightly show all construction lines (or you will loose points)