iot poly engineering 2-19 23 jan 12 get out your isometric graph paper sheets. technical graphic...
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IOT
POLY ENGINEERING2-19
23 JAN 12
Get out your isometric graph paper sheets.
Tech
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Tech
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l Gra
phic
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mun
icati
onDRAWING ISOMETRICS
Let each grid space = 1/2”
On the same diagonal (isometric) grid as yesterday’s classwork, draw the following isometric.
IOT
POLY ENGINEERING2-21
23 JAN 12
Take out your notebook to take notes.
Tech
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IOT
POLY ENGINEERING2-10
• A way of showing depth, like isometric• Part orthographic / part isometric:
– One face is true form– Parallel lines behind; either:
» Full scale» Half scale» Three-quarter scale
REVIEW/OBLIQUETY
PE 3
: P
ICTO
RIA
L
IOT
POLY ENGINEERING2-10
REVIEW/ISOMETRICTY
PE 3
: P
ICTO
RIA
L
Isometric Cube:
1) all lines equal length;
2) all faces equal area;
3) perimeter is a hexagon
• From Greek: Equal Measure– Isos: Equal– Metron: Measure
• The scale along each axis of the projection is the same• True form parallel lines are shown as parallel (note colors
below)• All isometrics: simple construction
IOT
POLY ENGINEERING2-10
• Latin: perspicere – to see through• An approximate representation of an image as it is
perceived by the eye. • The most characteristic feature of perspectives is that
objects are drawn:
Smaller as their distance from the observer increases
REVIEW/PERSPECTIVETY
PE 3
: P
ICTO
RIA
L
IOT
POLY ENGINEERING2-10
•Inclines (slants) are not shown as true size in standard views.
• Each square below represents 1”. What are the widths of the front view and right side views?
– 9” and 4”, respectively
REVIEW/AUXILIARY VIEWSTY
PE 2
: M
ULTI-
VIE
W
FRP
HRP
PRP
•Neither the front, top, or side view shows the true size and shape of the object’s inclined surface.
IOT
POLY ENGINEERING2-21
1. Describe an isometric view.2. Prepare drawing paper.3. Locate center of drawing space.4. Plot starting point of drawing.5. Complete isometric drawing.
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DRAFTING ISOMETRIC DRAWINGS
IOT
POLY ENGINEERING2-21
1. Describe an isometric view1. Height2. Width 3. Depth
(of the front view)
Tech
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2. Prepare drawing paper3. Locate center of drawing space
Tech
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onDRAFTING ISOMETRIC DRAWINGS
45 degree triangle
Construction Lines
4. Plot starting point of drawing
Tech
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DRAFTING ISOMETRIC DRAWINGS
30-60-90 triangle
1) ½ W2) ½ D3) ½ H
Starting Point
IOT
POLY ENGINEERING2-21
5. Complete isometric drawing
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DRAFTING ISOMETRIC DRAWINGS
Starting Point
IOT
POLY ENGINEERING2-21
Draft the following isometrics on drawing paper (use dimensions previously given for left drawing):
ISOMETRIC PRACTICESTUDENTS THAT TALK WILL NOT PARTICPATE
NO TALKING – GET DRAFTING TOOLS &
2”
2”
4”
1”1”
1”
IOT
POLY ENGINEERING2-21
2”
2”
4”
1”1”
1”
IOT
POLY ENGINEERING2-16
• Identifying drawing types– Isometric, perspective, oblique, auxiliary
• Calculating start points– Horizontal and Vertical
• What angle should horizontal lines be drawn on an isometric? 30 degrees
• Draw isometric from orthographic proj.• List steps to find starting point for an
isometric drawing.
STUDY THE FOLLOWING FOR QUIZ Monday Te
chni
cal G
raph
ic C
omm
unic
ation
HOMEWORK
IOT
POLY ENGINEERING2-24
January 23, 2012
1. Bring your protractor, compass and ruler to class everyday.
2. Brief quiz Friday on the following:1. Describe the differences between isometric,
perspective, and oblique drawings2. On diagonal grid paper, draw an isometric
based on given orthographic projections3. Find the starting point for orthographic
projections and isometric drafting
IOT
POLY ENGINEERING2-24
QUIZ REVIEW
1. Isometrics:1. Parallel projection2. True size (you can measure the lengths accurately)
2. Perspectives:1. Shown as it is perceived by the eye2. Object gets smaller the farther away it is
3. Obliques:1. One face is orthographic projection2. The rest of object is parallel projection
2. On diagonal grid paper, draw an isometric based on given orthographic projections
QUIZ REVIEW
Quiz drawing will be an altered version of one of your homeworks:
1. Add width of front view to width of right view.
2. Add the space we will put between: 1.5”
4.5” + 2” = 6.5”
HORIZONTAL STARTING POINT
6.5” + 1.5” = 8”
3. Subtract from the total width.10” – 8” = 2”
4. Divide by 2.Horizontal Starting Point
= 1”
1. Add height of front view to height of top view.
2. Add the space we will put between: 1.5”
3” + 2” = 5”
VERTICAL STARTING POINT
5” + 1.5” = 6.5”
3. Subtract from the total height.7.25” – 6.5” = .75” =
3/4”4. Divide by
2.Vertical Starting Point = .375” = 3/8”
IOT
POLY ENGINEERING2-18
Tech
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l Gra
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onDRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
IOT
POLY ENGINEERING2-17
Tech
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l Gra
phic
Com
mun
icati
onDRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
IOT
POLY ENGINEERING2-18
Tech
nica
l Gra
phic
Com
mun
icati
onDRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
IOT
POLY ENGINEERING2-17
Tech
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l Gra
phic
Com
mun
icati
onDRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
Draw nonisometric lines Last
-cannot be measured directly
1. Object lines are heavy2. Dimension/Extension lines are medium3. Use arrowheads4. Leave space between object and extension lines5. All numbers readable from bottom or right6. Keep dimensions in line with the drawing
Tech
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onDIMENSIONING ISOMETRICS
1”
1”
2”
Dimension your isometrics for homework
REMEMBER – one of the characteristics of engineering is that they can think abstractly…
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ISOMETRICS from ORTHOGRAPHICS
IOT
POLY ENGINEERING2-18
• Front view is typically drawn first• You must look at all views
Tech
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Let each grid space = ½”
IOT
POLY ENGINEERING2-18
• Front view is typically drawn first• You must look at all views
Tech
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Let each grid space = ½”
Complete Orthographic-to-Isometric #5-10 drawings. Include dimensions.
Tech
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#7 – Missing Dimensions1.5”
.75”
1. 2.
3. 4.
57
6
57
6
810
9
810
9
IOT
POLY ENGINEERING2-21
Draft the following isometrics on drawing paper (use dimensions previously given for left drawing):
ISOMETRIC PRACTICESTUDENTS THAT TALK WILL NOT PARTICPATE
NO TALKING – GET DRAFTING TOOLS &
2”
2”
4”
1”1”
1”
IOT
POLY ENGINEERING2-21
2”
2”
4”
1”1”
1”
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