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Print handouts Select File, Print Edit the following selections to read: Select the OK button. Chapter 6 – Pictorial Sketching . Chapter 6 – Pictorial Sketching . Projection Systems . Page 169. Multiview vs Axonometric Projection. Page 170, Figure 6.2. Overview.

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Chapter 6 pictorial sketching l.jpg

Print handouts

Select File, Print

Edit the following selections to read:

Select the OK button

Chapter 6 – Pictorial Sketching





Overview l.jpg
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 l.jpg
Exploded Isometric Assembly

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


Axonometric projections l.jpg
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 l.jpg
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 l.jpg
Axis, Views and Dimensions

3D - Isometric

Axis?

Views?

Top

Top

Front

R Side

Front

R Side

2D - Orthographic


Axis views and dimensions11 l.jpg
Axis, Views and Dimensions

3D - Isometric

Axis?

Views?

Top

Top

Front

R Side

Front

R Side

2D - Orthographic


Axis views and dimensions12 l.jpg
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 l.jpg
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.


Axis 1 st position vs 2 nd position l.jpg

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 l.jpg
Solid Modeling Demo

  • Pro/ENGINEER (planes)


Example l.jpg
Example

¼” GRID


Locating features l.jpg
Locating Features

Page 158

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


Plotting points l.jpg

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 points19 l.jpg
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 points20 l.jpg
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 points21 l.jpg
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


Plotting points22 l.jpg

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 points23 l.jpg
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 points24 l.jpg
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 points25 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 isometric29 l.jpg
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 l.jpg
Sketching

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


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