iot poly engineering 2-8 1.what are the three rules for drawing? 1)always pull your pencil; do not...
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IOT
POLY ENGINEERING2-8
1. What are the three rules for drawing?1) Always PULL your pencil; do not push it.
2) ALL lines begin as light construction lines.
3) Use appropriate line weights and types for final lines.
2. Get out your orthographic projections assignment.
1 Nov 10
DRILL
• 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
IOT
POLY ENGINEERING2-9
Objectives
Tech
nica
l Gra
phic
Com
mun
icati
onThe remainder of Unit 2:
Technical Graphic Communication
• 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
IOT
POLY ENGINEERING2-9
SKETCHESTY
PE 1
: SKE
TCH
ES
• 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)
IOT
POLY ENGINEERING2-9
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
• There are 6 standard views:
• Which views to use?– The different features of an object will suggest which
views to draw. – Standard is:
IOT
POLY ENGINEERING2-9
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
IOT
POLY ENGINEERING2-9How are orthographic projections drawn?
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
IOT
POLY ENGINEERING2-9
• Reference Planes:–Frontal Reference Plane
»Front View–Horizontal Reference Plane
»Top View–Profile Reference Plane
»Side View
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
IOT
POLY ENGINEERING2-9
– Frontal Reference Plane» Front View
– Horizontal Reference Plane» Top View
– Profile Reference Plane» Side View
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
Which Reference Plane?HRP
Which Reference Plane?PRP
Which View?FRONT
Which Reference Plane?HRP
FRP
Which View?RIGHT
Which Reference Plane?
Now, sketch the Horizontal Reference Plane and label the view and other planes.
IOT
POLY ENGINEERING2-9
• Reference Planes:– Frontal Reference Plane
» Front View– Horizontal Reference Plane
» Top View– Profile Reference Plane
» Side View
MULTI-VIEWTY
PE 2
: MU
LTI-V
IEW
Which Reference Plane?FRP
Which Reference Plane?PRP
Which View?TOP
IOT
POLY ENGINEERING2-9
• Reference Planes:– You can also have multiple positions of the same
reference planes
MULTI-VIEW
IOT
POLY ENGINEERING2-9
• 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:
SECTIONAL VIEWSTY
PE 2
: MU
LTI-V
IEW
IOT
POLY ENGINEERING2-9
• Sectional Views– Different materials have different sectional views
SECTIONAL VIEWSTY
PE 2
: MU
LTI-V
IEW