Upload
others
View
8
Download
0
Embed Size (px)
Citation preview
Ahmed Kovacevic, City University London
Design web
1
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
Design web
2
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
Design web
3
Exercise DrE-2 for this week
Ahmed Kovacevic, City University London
Design web
4
Ahmed Kovacevic, City University London
Design web
5
Ahmed Kovacevic, City University London
Design web
6
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
Ahmed Kovacevic, City University London
Design web
7
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
Ahmed Kovacevic, City University London
Design web
8
Pictorials
Ahmed Kovacevic, City University London
Design web
9
Axonometric views
Ahmed Kovacevic, City University London
Design web
10
Theory of isometric projection
Ahmed Kovacevic, City University London
Design web
11
Isometric projection - drawing
Ahmed Kovacevic, City University London
Design web
12
Size
Ahmed Kovacevic, City University London
Design web
13
Positions of isometric axes and their effect on the view created
Ahmed Kovacevic, City University London
Design web
14
Isometric and non-isometric lines
Ahmed Kovacevic, City University London
Design web
15
An isometric drawing
Hidden lines are usually not shown
Ahmed Kovacevic, City University London
Design web
16
The basic steps used to create
an isometric sketch of an object
Ahmed Kovacevic, City University London
Design web
17
Isometric representation of circles
Ahmed Kovacevic, City University London
Design web
18
Ahmed Kovacevic, City University London
Design web
19
Steps used to construct a sketch of an isometric cylinder
Ahmed Kovacevic, City University London
Design web
20
Steps used to construct a sketch of a semi-ellipse
Ahmed Kovacevic, City University London
Design web
21
Angles and irregular shapes in an isometric sketch
Ahmed Kovacevic, City University London
Design web
22
Isometric Assembly Drawing
Ahmed Kovacevic, City University London
Design web
23
Oblique projection
Ahmed Kovacevic, City University London
Design web
24
Types and angles of oblique projections
Ahmed Kovacevic, City University London
Design web
25
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
Ahmed Kovacevic, City University London
Design web
26
Yes and No for oblique projections
Ahmed Kovacevic, City University London
Design web
27
Perspective projections
Ahmed Kovacevic, City University London
Design web
28
Vanishing point
Ahmed Kovacevic, City University London
Design web
29
Horizon line position
Ahmed Kovacevic, City University London
Design web
30
How to create a one point perspective?
Ahmed Kovacevic, City University London
Design web
31
Exercise DrE-2