engineering drawing and design - lecture 3
TRANSCRIPT
Ahmed Kovacevic, City University London
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Pictorial projections
Prof Ahmed Kovacevic
School of Engineering and Mathematical Sciences
Room CG25, Phone: 8780, E-Mail: [email protected]
www.staff.city.ac.uk/~ra600/intro.htm
Engineering Drawing and Design - Lecture 3
ME 1110 – Engineering Practice 1
Ahmed Kovacevic, City University London
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Objectives for today
How to represent a 3-D object
effectively on a 2-D drawing surface
with a single view (pictorials)
How to generate pictorials using only
hand drawing tools
Recognize types of pictorials
Ahmed Kovacevic, City University London
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Exercise DrE-2 for this week
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Pictorials
Definition:A sketch developed for ease of visualization that shows
an objects height, width, and depth in a single view
Particularly useful for non-technical audiences
» Pictorials are generally not dimensioned
» Surfaces are often shaded
» Hidden lines are not shown
Helpful in the ideation phase of design
May be easily drawn with CAD programs
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Pictorials
Parallel Projection
» Oblique Pictorials–Parallel projectors are not perpendicular to the
projection plane
» Axonometric Pictorials–Projection lines are perpendicular to the
projection plane as in a multiview drawing
–Example is Isometric
Perspective Projection» Conveys information about distance and size
» Not as common as parallel projection
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Pictorials
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Axonometric views
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Theory of isometric projection
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Isometric projection - drawing
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Size
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Positions of isometric axes and their effect on the view created
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Isometric and non-isometric lines
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An isometric drawing
Hidden lines are usually not shown
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The basic steps used to create
an isometric sketch of an object
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Isometric representation of circles
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Steps used to construct a sketch of an isometric cylinder
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Steps used to construct a sketch of a semi-ellipse
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Angles and irregular shapes in an isometric sketch
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Isometric Assembly Drawing
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Oblique projection
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Types and angles of oblique projections
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How to generate oblique projection
The construction of an
oblique sketch is a
multistep process that
begins by boxing in the
front view, adding
details, and then boxing
in the depth dimension
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Yes and No for oblique projections
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Perspective projections
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Vanishing point
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Horizon line position
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How to create a one point perspective?
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Exercise DrE-2