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ME 1110 – Engineering Practice 1
Engineering Drawing and Design - Lecture 3
Pictorial projections
Prof Ahmed Kovacevic
School of Engineering and Mathematical Sciences
Room CG25, Phone: 8780, E-Mail: a.kovacevic@city.ac.uk
www.staff.city.ac.uk/~ra600/intro.htm
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Ahmed Kovacevic, City University London
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Objectives for today
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How to represent a 3-D object
effectively on a 2-D drawing surface
with a single view (pictorials)
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How to generate pictorials using only
hand drawing tools
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Recognize types of pictorials
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Exercise DrE-2 for this week
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Ahmed Kovacevic, City University London
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Pictorials
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Definition:
A sketch developed for ease of visualization that shows
an objects height, width, and depth in a single view
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Particularly useful for non-technical audiences
» Pictorials are generally not dimensioned
» Surfaces are often shaded
» Hidden lines are not shown
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Helpful in the ideation phase of design
May be easily drawn with CAD programs
Ahmed Kovacevic, City University London
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Pictorials
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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
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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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Ahmed Kovacevic, City University London
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
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Ahmed Kovacevic, City University London