1. Technical Graphic Communication
IOT POLY ENGINEERING
2-19
23 JAN 12
Get out your isometric graph paper sheets.
Technical Graphic Communication

2. Technical Graphic Communication
DRAWING ISOMETRICS
On the same diagonal (isometric) grid as yesterday’s classwork, draw the following isometric.
Let each grid space = 1/2”
Technical Graphic Communication

3. Technical Graphic Communication
23 JAN 12
IOT POLY ENGINEERING
2-21
Take out your notebook to take notes.
Technical Graphic Communication

4. REVIEW/OBLIQUE 2-10 3 A way of showing depth, like isometric
IOT POLY ENGINEERING
2-10
REVIEW/OBLIQUE 3
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
TYPE 3: PICTORIAL

5. REVIEW/ISOMETRIC 2-10 3 TYPE 3: PICTORIAL From Greek: Equal Measure
IOT POLY ENGINEERING
2-10
REVIEW/ISOMETRIC 3
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
TYPE 3: PICTORIAL
Isometric Cube:
1) all lines equal length;
2) all faces equal area;
3) perimeter is a hexagon

6. REVIEW/PERSPECTIVE 2-10 3 TYPE 3: PICTORIAL
IOT POLY ENGINEERING
2-10
REVIEW/PERSPECTIVE 3
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
TYPE 3: PICTORIAL

7. REVIEW/AUXILIARY VIEWS
IOT POLY ENGINEERING
2-10
REVIEW/AUXILIARY VIEWS 2
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
TYPE 2: MULTI-VIEW
Neither the front, top, or side view shows the true size and shape of the object’s inclined surface.
FRP
HRP
PRP

8. DRAFTING ISOMETRIC DRAWINGS
IOT POLY ENGINEERING
2-21
DRAFTING ISOMETRIC DRAWINGS
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.
Technical Graphic Communication

9. DRAFTING ISOMETRIC DRAWINGS
IOT POLY ENGINEERING
2-21
DRAFTING ISOMETRIC DRAWINGS
Describe an isometric view
Height
Width
Depth
(of the front view)
Technical Graphic Communication

10. DRAFTING ISOMETRIC DRAWINGS
Prepare drawing paper
Locate center of drawing space
Construction Lines
Technical Graphic Communication
45 degree triangle

11. DRAFTING ISOMETRIC DRAWINGS
Plot starting point of drawing
1) ½ W
2) ½ D
3) ½ H
Technical Graphic Communication
triangle
Starting Point

12. DRAFTING ISOMETRIC DRAWINGS
IOT POLY ENGINEERING
2-21
DRAFTING ISOMETRIC DRAWINGS
Complete isometric drawing
Technical Graphic Communication
Starting Point

13. STUDENTS THAT TALK WILL NOT PARTICPATE
IOT POLY ENGINEERING
2-21
ISOMETRIC PRACTICE
STUDENTS THAT TALK WILL NOT PARTICPATE
NO TALKING – GET DRAFTING TOOLS &
Draft the following isometrics on drawing paper (use dimensions previously given for left drawing): 2” 2” 1” 1” 1” 4”

14. IOT POLY ENGINEERING
2-21 2” 2” 1” 1” 1” 4”

15. STUDY THE FOLLOWING FOR QUIZ Monday Technical Graphic Communication
IOT POLY ENGINEERING
2-16
HOMEWORK
STUDY THE FOLLOWING FOR QUIZ Monday
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.
Technical Graphic Communication

16. IOT POLY ENGINEERING
2-24
January 23, 2012
Bring your protractor, compass and ruler to class everyday.
Brief quiz Friday on the following:
Describe the differences between isometric, perspective, and oblique drawings
On diagonal grid paper, draw an isometric based on given orthographic projections
Find the starting point for orthographic projections and isometric drafting

17. QUIZ REVIEW 2-24 Isometrics: Perspectives: Obliques:
IOT POLY ENGINEERING
2-24
QUIZ REVIEW
Isometrics:
Parallel projection
True size (you can measure the lengths accurately)
Perspectives:
Shown as it is perceived by the eye
Object gets smaller the farther away it is
Obliques:
One face is orthographic projection
The rest of object is parallel projection

18. Quiz drawing will be an altered version of one of your homeworks:
QUIZ REVIEW
On diagonal grid paper, draw an isometric based on given orthographic projections
Quiz drawing will be an altered version of one of your homeworks:

19. HORIZONTAL STARTING POINT
1. Add width of front view to width of right view.
4.5” + 2” = 6.5”
2. Add the space we will put between: 1.5”
6.5” + 1.5” = 8”
3. Subtract from the total width.
10” – 8” = 2”
4. Divide by 2.
Horizontal Starting Point = 1”

20. VERTICAL STARTING POINT
1. Add height of front view to height of top view.
3” + 2” = 5”
2. Add the space we will put between: 1.5”
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”

21. Start with the lead line Technical Graphic Communication
IOT POLY ENGINEERING
2-18
DRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
Technical Graphic Communication

22. Start with the lead line Technical Graphic Communication
IOT POLY ENGINEERING
2-17
DRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
Technical Graphic Communication

23. Start with the lead line Technical Graphic Communication
IOT POLY ENGINEERING
2-18
DRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
Technical Graphic Communication

24. DRAWING ISOMETRICS 2-17 Technical Graphic Communication
IOT POLY ENGINEERING
2-17
DRAWING ISOMETRICS
Let each grid space = ¼”
Start with the lead line
Draw nonisometric lines Last
-cannot be measured directly
Technical Graphic Communication

25. Dimension your isometrics for homework
DIMENSIONING ISOMETRICS
Object lines are heavy
Dimension/Extension lines are medium
Use arrowheads
Leave space between object and extension lines
All numbers readable from bottom or right
Keep dimensions in line with the drawing
Dimension your isometrics for homework
Technical Graphic Communication 1” 2” 1”

26. ISOMETRICS from ORTHOGRAPHICS Technical Graphic Communication
REMEMBER – one of the characteristics of engineering is that they can think abstractly…
Technical Graphic Communication

27. ISOMETRICS from ORTHOGRAPHICS Technical Graphic Communication
IOT POLY ENGINEERING
2-18
ISOMETRICS from ORTHOGRAPHICS
Let each grid space = ½”
Front view is typically drawn first
You must look at all views
Technical Graphic Communication

28. ISOMETRICS from ORTHOGRAPHICS Technical Graphic Communication
IOT POLY ENGINEERING
2-18
ISOMETRICS from ORTHOGRAPHICS
Let each grid space = ½”
Front view is typically drawn first
You must look at all views
Technical Graphic Communication

29. CLASSWORK
Complete Orthographic-to-Isometric #5-10 drawings. Include dimensions.
#7 – Missing Dimensions
1.5”
Technical Graphic Communication
.75”

30. 1. 2. 3. 4.

31. 7 7 6 6 5 5

32. 10 10 9 9 8 8

33. STUDENTS THAT TALK WILL NOT PARTICPATE
IOT POLY ENGINEERING
2-21
ISOMETRIC PRACTICE
STUDENTS THAT TALK WILL NOT PARTICPATE
NO TALKING – GET DRAFTING TOOLS &
Draft the following isometrics on drawing paper (use dimensions previously given for left drawing): 2” 2” 1” 1” 1” 4”

34. IOT POLY ENGINEERING
2-21 2” 2” 1” 1” 1” 4”