Week 4 Drawings

1. IDES 2105 Computer Applications
Technical Drawings

2. IDES 2105 Computer Applications
Technical Drawings
• Technical drawing standards
were first introduced about 60
years ago.
• In Canada we use the CSA CAN-
B78. This standard is similar to
most other standards such as
ISO (International Standards
Association) and ANSI (American
National Standards Institute).

3. IDES 2105 Computer Applications
Technical Drawings

4. IDES 2105 Computer Applications
Technical Drawings

5. IDES 2105 Computer Applications
Technical Drawings
Orthographic Views
• Use as many views as
necessary to show the design
intent
• Always draw to scale (indicate
standard scale in title block and
label scale if different from this)
• Always use 3rd angle projection
in North America
• Put an ISO Symbol on each
page to show 3rd angle
projection

6. IDES 2105 Computer Applications
Technical Drawings

7. IDES 2105 Computer Applications
Technical Drawings
Enlarged Detail Views
Small but important details should be
enlarged as if looked upon through looking
glass. The detailed view should be called
out and named. The detail should be
oriented in the same way as the main view
and identified through name and scale.
3D Views
Isometric or perspective views can be
helpful in terms of interpreting a drawing,
but are complimentary and subordinate
to orthographic and other views. They
are often included but drawn at a smaller
scale.

8. IDES 2105 Computer Applications
Technical Drawings
Exploded Views
• These help explain how parts are
held together. These are not usually
required in technical drawings, except
for assembly floor drawings.
Sectional Views
• Section views are drawn so that the
viewer is looking at the cutting plane in
the direction of the cutting plane
arrows
• Place sections behind arrows of cutting
plane (arrows indicate view direction),
when possible. Otherwise name them
and relocate to another sheet. They
should be projected in 3rd angle.

9. IDES 2105 Computer Applications
Technical Drawings
GA – General Arrangement
• A GA is a common deliverable
for industrial designers. The
GA communicates the design
intent of a product prior to part
design finalization.
• The GIA includes a Bill of
Materials (BOM), which
specifies materials and
textures for exterior parts.
• GIA’s typically include
different views, primarily
orthographic and sectional.
Adobe Illustrator is commonly
used as a drawing tool.

10. IDES 2105 Computer Applications
Technical Drawings
GA – General Assembly
• As the product is finalized for
production, the GIA evolves
into an assembly of parts.
This general assembly
drawing will reference parts,
which of course need to fit
together in mass production.
• All specific notes about
materials, colours and
textures are transferred to
the part drawings (see
below) at this point. The
BOM is therefore updated to
read as a parts list.

11. IDES 2105 Computer Applications
Technical Drawings
PD – Part Drawings
• These are the final drawings
for each part in the product.
They contain notes about
manufacturing issues:
material, colour, texture,
production tolerance and so
on.
• Part drawings usually contain
critical dimensions for fit, but
not necessarily all dimensions
for manufacturing, since tools
are often machined from the
3D data.

12. IDES 2105 Computer Applications
Technical Drawings

13. IDES 2105 Computer Applications
Technical Drawings

14. IDES 2105 Computer Applications
Technical Drawings

15. IDES 2105 Computer Applications
Technical Drawings

16. IDES 2105 Computer Applications
Technical Drawings