Multiview

1
Chapter 5

• Multiview
• Sketching
• Projection

2
Orthographic Projection

• A system of drawing views of an object using

3
Six Standard Views

• 
  
• Front
• Usually shows most
• If applicable should show object in operating
  condition (I.e. car)

4
View Placement

• Front view usually shows the most detail

Projection Lines

• Why must views be arranged so that they align?

5
Revolving an Object to Produce the Six Basic
Views
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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 point on 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)

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Projection of an Object
8
Projection of an Object
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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

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Glass Box Method
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DEMO

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

12
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

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Chapter 5

• Multiview
• Sketching
• Projection
• Part 2

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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
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3 Views - Most Common
Three views necessary?
Which view could be eliminated?
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Transferring Dimensions

• Mitered System
• Dividers or Scale

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Mitered System

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

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Mitered System contd.

• Project additional points, surface by surface.

1
1
3
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Mitered System contd.

• Project additional points, surface by surface.

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Mitered System contd.

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

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Dividers or Scale

• With folding lines

• Without folding lines

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Hidden Lines
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Exericse

• Block_3
• Sketch, full scale, 6 views
• Label appropriately
• Dimension
• Block_4
• Sketch 3 views
• Do NOT label the views
• Dimension

24
Chapter 5

• Multiview
• Sketching
• Projection
• Part 3

25
Review Hidden Lines
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Surface Identification
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View Identification
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Configuration Rule
INCLINDED PLANES
EDGE
EDGE
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Configuration Rule
OBLIQUE PLANE
? PLANE
EDGE
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Configuration Rule
? PLANE

• Is this one correct?

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Points, Lines Planes

• If all else fails,
• Break the object down to simpler shapes
• Locate the height, width and depth of each point.

32
Exercise
33
Exercise

• Sketch 3 views and dimension Blocks_5 - 20

34
Chapter 5

• Multiview
• Sketching
• Projection
• Part 4

35
Center Lines
36
Center Lines
HOW MANY CENTER LINES MISTAKES?
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Center Lines

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

End of cylinder
End of hole
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Precedence of Lines
HIDDEN LINES TAKE PRECEDENCE OVER
OBJECT LINES TAKE PRECEDENCE OVER
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Center Lines
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41
Projection of an Object
POOR PRACTICE
PREFFERED
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Projection of an Object
POOR PRACTICE
PREFFERED PRACTICE
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Exercise

• Sketch 3 views and dimension Blocks_21 - 29