Chapter 5
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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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Chapter 5

Print handouts

Select File, Print

Edit the following selections to read:

Select the OK button

Chapter 5

Multiview

Sketching

&

Projection


Orthographic projection

Orthographic Projection

  • A system of drawing views of an object using


Six standard views

Six Standard Views

  • Front

    • Usually shows most

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


View placement

View Placement

  • Front view usually shows the most detail

Projection Lines

  • Why must views be arranged so that they align?


Revolving an object to produce the six basic views

Revolving an Object to Produce the Six Basic Views


The glass box metaphor

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)


Projection of an object

Projection of an Object


Projection of an object1

Projection of an Object


Unfolding the glass box

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


Glass box method

Glass Box Method


Chapter 5 27257

DEMO

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


Exercise

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


Chapter 51

Chapter 5

Multiview

Sketching

&

Projection

Part 2


Necessary views

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

3 Views - Most Common

Three views necessary?

Which view could be eliminated?


Transferring dimensions

Transferring Dimensions

  • Mitered System

  • Dividers or Scale


Mitered system

Mitered System

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


Mitered system cont d

Mitered System cont’d.

2

1

3

4

  • Project additional points, surface by surface.

1

1

3


Mitered system cont d1

Mitered System cont’d.

2

1

8

7

6

3

5

4

  • Project additional points, surface by surface.


Mitered system cont d2

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

Dividers or Scale

  • With folding lines

  • Without folding lines


Hidden lines

Hidden Lines


Exericse

Exericse

  • Block_3

    • Sketch, full scale, 6 views

    • Label appropriately

    • Dimension

  • Block_4

    • Sketch 3 views

    • Do NOT label the views

    • Dimension


Chapter 52

Chapter 5

Multiview

Sketching

&

Projection

Part 3


Review hidden lines

Review Hidden Lines


Surface identification

Surface Identification


View identification

View Identification


Configuration rule

Configuration Rule

INCLINDED PLANES

EDGE

EDGE


Configuration rule1

EDGE

TS

EDGE

NORMAL PLANE

Configuration Rule

OBLIQUE PLANE

? PLANE

EDGE


Configuration rule2

Configuration Rule

? PLANE

  • Is this one correct?


Points lines planes

Points, Lines & Planes

  • If all else fails,

    • Break the object down to simpler shapes

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


Exercise1

Exercise


Exercise2

Exercise

  • Sketch 3 views and dimension Blocks_5 - 20


Chapter 53

Chapter 5

Multiview

Sketching

&

Projection

Part 4


Center lines

Center Lines


Center lines1

Center Lines

HOW MANY CENTER LINES MISTAKES?


Center lines2

Center Lines

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

End of cylinder

End of hole


Precedence of lines

Precedence of Lines

HIDDEN LINES TAKE PRECEDENCE OVER

OBJECT LINES TAKE PRECEDENCE OVER


Center lines3

Center Lines


Projection of an object2

Projection of an Object

POOR PRACTICE

PREFFERED


Projection of an object3

Projection of an Object

POOR PRACTICE

PREFFERED PRACTICE


Exercise3

Exercise

  • Sketch 3 views and dimension Blocks_21 - 29


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