1. 1 Nov 10 DRILL 2-8 What are the three rules for drawing?
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2-8
1 Nov 10
DRILL
What are the three rules for drawing?
Always PULL your pencil; do not push it.
ALL lines begin as light construction lines.
Use appropriate line weights and types for final lines.
Get out your orthographic projections assignment.

10. Objectives 2-9 The remainder of Unit 2:
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2-9
The remainder of Unit 2:
Technical Graphic Communication
Objectives
Cover the 3 main technical drawing types and their ~12 variations
Establish class standards for technical drawing
Further develop and apply skills in drafting
Develop and apply skills in Google Sketchup
Technical Graphic Communication

11. SKETCHES 2-9 1 One of many drafting techniques
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2-9
SKETCHES 1
One of many drafting techniques
Quick way to show an idea that would be difficult to describe with words alone
Used mainly in Engineering Design Process Step 2: Brainstorm, Research, and Generate Ideas
NO DRAWING TOOLS (not even a straightedge)
Rules of drawing STILL APPLY
Pull, don’t push
LIGHT construction lines
Use appropriate line weight and type
TYPE 1: SKETCHES

12. MULTI-VIEW 2-9 2 Orthographic Projections:
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2-9
MULTI-VIEW 2
Orthographic Projections:
Ortho: straight or at right angles
Graphic: written down
Pro: forward
Jacere: to throw
“To throw straight forward and write down”
The method of representing the exact form of an object in 2 or more views on planes (usually at right angles to each other)
TYPE 2: MULTI-VIEW

13. MULTI-VIEW 2-9 2 There are 6 standard views: Which views to use?
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2-9
MULTI-VIEW 2
There are 6 standard views:
Which views to use?
The different features of an object will suggest which views to draw.
Standard is:
TYPE 2: MULTI-VIEW

14. How are orthographic projections drawn?
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2-9
MULTI-VIEW 2
TYPE 2: MULTI-VIEW
How are orthographic projections drawn?

15. MULTI-VIEW 2-9 2 TYPE 2: MULTI-VIEW Reference Planes:
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2-9
MULTI-VIEW 2
Reference Planes:
Frontal Reference Plane
Front View
Horizontal Reference Plane
Top View
Profile Reference Plane
Side View
TYPE 2: MULTI-VIEW

16. IOT POLY ENGINEERING
2-9
MULTI-VIEW 2
Frontal Reference Plane
Front View
Horizontal Reference Plane
Top View
Profile Reference Plane
Side View
Now, sketch the Horizontal Reference Plane and label the view and other planes.
Which Reference Plane?
HRP
TYPE 2: MULTI-VIEW
Which Reference Plane?
HRP
Which View?
FRONT
Which Reference Plane?
Which View?
PRP
RIGHT
Which Reference Plane?
FRP

17. MULTI-VIEW 2-9 2 TYPE 2: MULTI-VIEW Reference Planes:
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2-9
MULTI-VIEW 2
Reference Planes:
Frontal Reference Plane
Front View
Horizontal Reference Plane
Top View
Profile Reference Plane
Side View
TYPE 2: MULTI-VIEW
Which View?
Which Reference Plane?
TOP
PRP
Which Reference Plane?
FRP

18. MULTI-VIEW 2-9 2 Reference Planes:
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MULTI-VIEW 2
Reference Planes:
You can also have multiple positions of the same reference planes

19. SECTIONAL VIEWS 2-9 2 Sectional Views TYPE 2: MULTI-VIEW
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2-9
SECTIONAL VIEWS 2
Sectional Views
How an object looks if a cut were made through it perpendicular to the direction of sight.
For example, if we cut the shape below at PRP 2 and drew the shape (including its “insides”) we would have a sectional view:
TYPE 2: MULTI-VIEW

20. SECTIONAL VIEWS 2-9 2 Sectional Views TYPE 2: MULTI-VIEW
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2-9
SECTIONAL VIEWS 2
Sectional Views
Different materials have different sectional views
TYPE 2: MULTI-VIEW