APSC 1151 Introduction to Engineering Graphics
Section R10, Fall 2012
Instructor: Dr. Michael Poon
Richmond Office: R3270
Email: [email protected]
Course Description (from Kwantlen Calendar)
Students will study technical sketching, orthogr
How to Draw Lines
If using a straight edge, leave a small space between
the straightedge and the pencil.
To produce darker, thicker lines, it is better to choose
the appropriate lead and only u
Descriptive Geometry - Planes
The minimum requirements to describe a plane in
3D space are three points on the plane.
A plane in orthographic
projection may also be
represented by two
parallel lines; a point
and a line; or by
Technical drawings may represent a single part with a
complex interior structure, or many different parts in a
If the interior structure cannot be shown clearly using
hidden lines, then a section vi
Descriptive Geometry Intersections:
For lines to be intersecting, the same intersection point
must be seen in all views.
If lines are observed to
intersect at the same
point in two views,
they must intersect
at the same point in
What have we learned so far with orthographic drawings?
Rules of projection
Points, lines and planes
Simplified, removed, partial views
Some products are produced at a single location from
raw form to finished product.
However, more complex products have parts
manufactured at different locations and by different
companies think about Boeing or General Motors.
How can they ensure
The purpose of an engineering drawing is to convey the
ideas and thoughts of one person to another in a clear,
concise and accurate manner.
If we want our drawings to be interpreted correctly by
another person and vice versa
Review Orthographic Drawings
1. Using construction lines, lightly block out the outline
of the part in all views.
2. Ensure that all the views are correctly located with
respect to one another.
3. Ensure that the views are correctly aligned with
An orthographic drawing is basically made up of a
series of areas, lines and points visualization involves
putting these features together to form a 3-D part that
is consistent with the orthographic views.
The first step in
Rounds and Fillets
Rounds and fillets are rounded intersections between
planes of a part.
A round is a rounding of an
outside corner used to improve
appearance and to provide an
element of safety by removing
Primary Auxiliary Views
Objects are often designed to have sloping or inclined
surfaces that do not appear true size in principal
To view features on these planes as true size, we must
use auxiliary views.
Materials and Processes
Within the design process, the selection of materials
and processes is part of the analysis phase. Parts are
designed with specific strength, size and weight
requirements that may require a particular type of
Typically when you design something, it will call for
more than one part.
Even the common hammer is made up of at least two
In addition to considering how parts are made, the
design must also account for how the parts will join.
Descriptive Geometry Applications
Force a push or pull
Point of Application the point through which the
force is applied.
Compression the state created in a membe