Chapter 6 – Pictorial Sketching

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Chapter 6 – Pictorial Sketching

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)
Exploded Isometric Assembly

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

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

Page 154

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.

Axis, Views and Dimensions

3D - Isometric

Axis?

Views?

Top

Top

Front

R Side

Front

R Side

2D - Orthographic

Axis, Views and Dimensions

3D - Isometric

Axis?

Views?

Top

Top

Front

R Side

Front

R Side

2D - Orthographic

Axis, Views and Dimensions

3D - Isometric

Axis?

Views?

Dimensions?

Top

Top

Depth

H

Front

R Side

Width

D

W

Isometric Line

Isometric Plane

Height

Front

R Side

2D - Orthographic

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.

Isometric Lines

H

Isometric Plane

D

Non-isometric Line

W

W

D

H

1st Position

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.

Non-isometric Plane

2nd Position

Solid Modeling Demo
• Pro/ENGINEER (planes)
Example

¼” GRID

Locating Features

Page 158

To locate a feature such as the upper block, make measurements from an existing corner as shown here.

0, 0, 0

0, 0, 0

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
• 2 1

2, 3, 1,4

1, 2 4, 3

0, 0, 0

W, H, D

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
• 2 1

Point 2:

1.5,

1.5,

.5

0, 0, 0

2, 3, 4, 1

1, 2 4, 3

0, 0, 0

0, 0, 0

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
• 2 1

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, 4, 1

1, 2 4, 3

0, 0, 0

0, 0, 0

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
• 2 1

, 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, 1,4

1, 2 4, 3

0, 0, 0

0, 0, 0

3’

2’

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
• 2 1

, 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’,

1’, 4’

3’

2, 3, 4, 1

1, 2 4, 3

0, 0, 0

0, 0, 0

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
• 2 1

, 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’,

1’, 4’

3’

2, 3, 4, 1

1, 2 4, 3

0, 0, 0

0, 0, 0

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.

2’

1’

3’

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

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.

2’

1’

3’

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

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.

Locating on a Non-isometric Plane

Locate the center of the circle.

.5, 1.0625, .75

Point 1 coordinates?

1

1

1

1

Complete the Isometric

Point 1:

0, 0, .625

.625, .5, 1.375

Point 2:

Point 3:

.625, ..5, 625

0, 0, .1.375

Point 4:

• 3 4
• 2 1

3

2

4

1

• 2 3
• 1 4

2, 3

1, 4

Complete the Isometric

Point 1:

0, 0, .625

.625, .5, 1.375

Point 2:

Point 3:

.625, .5, 625

0, 0, .1.375

Point 4:

• 3 4
• 2 1

3

2

4

1

• 2 3
• 4

2, 3

1, 4

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