Multiview Drawings - Notes · There are six views formed by the planes of a box. Viewing Objects...
Transcript of Multiview Drawings - Notes · There are six views formed by the planes of a box. Viewing Objects...
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Multiview Drawing
Definition:
Graphical representation of a 3-dimensional object on one plane (sheet of paper) using two or more views.
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Multiview Drawing
Another name for multiview drawing is orthographic projection.
Involves visualization and implementation
� Ability to see clearly in the mind’s eye an object
� Process of drawing the object
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1.63 1.25
5.13
2.00
2.88
2.25
1.50
2.50
3.50
45°Ø1.52
Orthographic ProjectionA system that allows you to make a two-dimensional drawing of a three-dimensional object.
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Six Principal Orthographic
Views
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Viewing Objects
Imagine a glass box is formed by six mutually perpendicular planes of projection that are located around the object.
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Viewing Objects
Lines are formed on the planes by projecting the edges of the object onto the planes.
� These images are called “views”.
� There are six views formed by the planes of a box.
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Viewing Objects
Unfolding the box produces an arrangement of the six views.
FRONTL.SIDE R.SIDE
TOP
BOTTOM
BACK
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Standard 2D views
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Angles of Projection
First-angle projection
� Used by many European countries
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TOP VIEW
FRONT VIEW RSIDE
Angles of Projection
Third-angle projection
� Standard for the United States
�Front view projected to vertical plane
�Top view projected to horizontal plane
�Right-side view projected to profile plane
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Third-angle Projection
First-angle Projection
First and Third Angle Projections
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View Placement
Each view is placed in a constant location relative to the other views
Each view must be placed in its correct position
Views and features must be aligned
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5.13
2.00
2.88
2.25
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3.50
45°Ø1.52
TOP VIEW
FRONT VIEW R. SIDEVIEW
Choosing Views
Most commonly used views� Front View
� Top View
� Right Side View
Most descriptive view is typically designated as the Front View
Normally the longest dimension is chosen as the width (or depth)
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Choosing Views
Complex objects require three views to describe its shape
Simple objects can be described with two views
� Ex: Soda Can
Thin objects can be described with only one view
� Depth is given in a note
� Ex: Erasing Shield
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Standard Views of Primitive Solids
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HEIGHT
WIDTH
DEPTH
Object Dimensions
All objects have 3 dimensions
� Height�Distance from top to bottom
�Width�Distance from side to side
� Depth�Distance from the front to back
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TOP VIEW
FRONT VIEW R. SIDE
VIEW
WIDTH
HEIGHT
DEPTH
DEPTH
Object Dimensions
Front View
� Shows width & height
Top View
� Shows width & depth
Side View
� Shows height & depth
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TOP VIEW
FRONT VIEWR. SIDE
Drawing Views of Objects
Depth can be projected between views by using a 45° miter line
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Line Types - Visible
Edges that can be seen in a given view areVisible or Object lines
Visible lines are thick and dark� .028” or .7mm
� F or HB lead
FRONT VIEW
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Lines on an engineering drawing signify more than just the geometry of the object and it isimportant that the appropriate line type is used.
Line Thickness
For most engineering drawings you will require two thickness', a thick and thin line. The general recommendation are that thick lines are twice as thick as thin lines.
A thin line is used for hatching, leader lines, short centre lines, dimensions and projections.
A thick continuous line is used for visible edges and outlines.
Line Styles
Other line styles used to clarify important features on drawings are:
Dashed lines are used to show important hidden detail for example wall thickness and holes..
Thin chain lines are a common feature on engineering drawings used to indicate centre lines. Centre lines are used to identify the centre of a circle, cylindrical features, or a line of symmetry.
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TOP VIEW
Line Types - Hidden
Edges that cannot be seen from a given view are indicated by Hiddenlines
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Line Types - Hidden
Drawing hidden lines� .125” (3mm) dashes
� .0625” (1mm) spaces between dashes
� Thin: .020” (.5mm)
� Dark: F or HB lead
.125"
.0625"
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Line Types – Center
Center lines indicate axes of symmetry
TOP VIEW
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FRONT VIEWR. SIDEVIEW
Line Types – Center
Perpendicular lines for circular objects
� Small dashes cross at the center point of feature
� One center line drawn to indicate longitudinal axis of cylinder or hole
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Line Types - Center
.125"
.0625".75" - 1.5"
Draw center lines using a series of long and short dashes� .125” (3mm) short dash @ the center
� .75”- 1.5” (20mm-40mm) long dash
� .0625” (1mm) spaces between dashes
� Thin: .02” (5mm)
Long dash extends .125” to .25” beyond feature
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Precedence of Lines
Which line should be drawn when two lines coincide?
� Visible line coincides with hidden or center line
�Visible line is shown
� Hidden line coincides with center line
�Hidden line is shown
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For Example:
1. Visible2. Hidden3. Center
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1.63 1.25
5.13
2.00
2.88
1.751.50
2.00
3.00
Ø2.22
TOP VIEW
FRONT VIEW R. SIDE VIEW
45°
SPECIAL CAM R. MIGLIORATO 5/9/03 SCALE 1:1 16-52 12 NBHS
Placement of Views
Views should be visually balanced within the working space
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Steps for Centering a Drawing
.75
.25
8.50
7.00
10.5011.00
.50
.25 .25
Draw border and title block using light construction lines
Draw diagonal lines from corners of border
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Steps for Centering a Drawing
Add:
� Width 5.13
� Space 1.50
� Depth 2.00
� Horizontal 8.63
� Height 3.00
� Space 1.50
� Depth 2.00
� Vertical 6.50
1.63 1.25
5.13
2.00
2.88
1.751.50
2.00
3.00
Ø2.22
TOP VIEW
FRONT VIEWR. SIDEVIEW
45°
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4.3"
3"
4.3"
3"
Steps for Centering a Drawing
Draw a box the size of all views
Measure from the center:
� Half the width
� Half the height
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FRONT VIEWR. SIDEVIEW
TOP VIEW
5.13 1.50 2.00
3.00
1.50
2.00
Steps for Centering a Drawing
Draw in views using light construction lines
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Adding Details
Add holes and features
Transfer horizontal and vertical features
Use miter line to transfer depth
TOP VIEW
FRONT VIEW R. SIDE VIEW
SPECIAL CAM R. MIGLIORATO 5/9/03 SCALE 1:1 16-52 12 NBHS
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Straight Edges
6
6
5
5
2
2
4
4
3
1
1
B
BA
A
1
3
5
2
4
1
A
B
6
6
6
5
5
2
2
4
4
3
1
1
B
BA
A A
1 2
4
Edges that are perpendicular to a plane of projection appear as a point
6
6
5
5
2
2
4
4
3
1
1
B
BA
A A
1 2
4
5 6
B
2 31
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Straight Edges
Edges that are parallel to a plane of projection appear as lines
Edges that are inclined to a plane of projection appear as foreshortened lines
POINT
VIEW
TRUE LENGTH
TRUE LENGTH
FORESHORTENED
TRUE LENGTH
FORESHORTENED
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Curved Edges
Curved edges project as straight lines on the plane to which they are perpendicular
Curved edges project as curved lines on the planes to which they are parallel or inclined
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Normal Surfaces
Normal surfaces appear as an edge in two opposite principal views, and appear a surface in all other principal views.
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Inclined Surfaces
Inclined surfaces appear as an edge in two opposite principal views, and appear foreshortened (not true size) in all other principal views.
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Oblique Surfaces
Oblique surfaces do not appear either as an edge or true size in any principal view.
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NO LINE
NO
LINE
Intersections & Tangencies
Where a curved surface is tangent to a plane surface, no line should be shown where they join
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Intersections & Tangencies
Where a plane surface intersects a curved surface, an edge is formed
LINE
LINE
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Intersections & Tangencies
Where the plane surface is horizontal or vertical, exceptions to these rules may occur
LINE
VERTICALSURFACE