# Chapter 5 - PowerPoint PPT Presentation

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Print handouts Select File, Print Edit the following selections to read: Select the OK button. Chapter 5. Multiview Sketching & Projection. Orthographic Projection. A system of drawing views of an object using. Six Standard Views . Front Usually shows most

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Chapter 5

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#### Presentation Transcript

Print handouts

Select File, Print

Edit the following selections to read:

Select the OK button

Multiview

Sketching

&

Projection

### Orthographic Projection

• A system of drawing views of an object using

### Six Standard Views

• Front

• Usually shows most

• If applicable – should show object in operating condition (I.e. car)

### View Placement

• Front view usually shows the most detail

Projection Lines

• Why must views be arranged so that they align?

### The Glass Box Metaphor

• Imagine that the object you are going to draw is positioned inside a glass box, so that the large flat surfaces of the object are parallel to the walls of the box.

• From each pointon the object, imagine a ray, or projector perpendicular to the wall of the box forming the view of the object on that wall or projection plane.

• 2 horizontal planes ( views)

• 2 frontal planes ( views)

• 2 profile planes ( views)

### Unfolding the Glass box

• For

• Imagine that the walls of the box are hinged and unfold the views outward around the front view.

• This will give you the standard arrangement of views for

### DEMO

• If a point, line or plane is in one view, it must be in all the views.

### Exercise

• Sketch Block_1 together

• Need

• HB pencil

• Engineering Calculation Paper

• Model

• Access instructions (www)

• eetsg27.bd.psu/~holidar

• Sketch the border & title block

• Sketch the object full scale

• Center the views inside the border

• Label

• Views – TOP, FRONT, etc.

• Size Description – dimensioning

• Block_2

• Sketch, full scale, 6 views, label appropriately, & dimension

Multiview

Sketching

&

Projection

Part 2

### Necessary Views

• A sketch or drawing should only contain the views needed to clearly and completely describe the object. Choose the views that show the .

One view drawing

of a shim

One view drawing

of a connecting rod

### 3 Views - Most Common

Three views necessary?

Which view could be eliminated?

### Transferring Dimensions

• Mitered System

• Dividers or Scale

### Mitered System

• Draw miter line at 45 degrees at a convenient distance to produce the desired view.

### Mitered System cont’d.

2

1

3

4

• Project additional points, surface by surface.

1

1

3

### Mitered System cont’d.

2

1

8

7

6

3

5

4

• Project additional points, surface by surface.

### Mitered System cont’d.

2

1

8

7

6

3

5

4

• Draw the view locating each vertex of the surface on the projection and miter line.

### Dividers or Scale

• With folding lines

• Without folding lines

### Exericse

• Block_3

• Sketch, full scale, 6 views

• Label appropriately

• Dimension

• Block_4

• Sketch 3 views

• Do NOT label the views

• Dimension

Multiview

Sketching

&

Projection

Part 3

INCLINDED PLANES

EDGE

EDGE

EDGE

TS

EDGE

NORMAL PLANE

OBLIQUE PLANE

? PLANE

EDGE

### Configuration Rule

? PLANE

• Is this one correct?

### Points, Lines & Planes

• If all else fails,

• Break the object down to simpler shapes

• Locate the height, width and depth of each point.

### Exercise

• Sketch 3 views and dimension Blocks_5 - 20

Multiview

Sketching

&

Projection

Part 4

### Center Lines

HOW MANY CENTER LINES MISTAKES?

### Center Lines

• ¼” past the end of the hole and/or cylinder

End of cylinder

End of hole

### Precedence of Lines

HIDDEN LINES TAKE PRECEDENCE OVER

OBJECT LINES TAKE PRECEDENCE OVER

POOR PRACTICE

PREFFERED

### Projection of an Object

POOR PRACTICE

PREFFERED PRACTICE

### Exercise

• Sketch 3 views and dimension Blocks_21 - 29