1. Communication Technology
IOT POLY ENGINEERING
2-10
October 10, 2008
DRILL
In the right view of the drawing below (PRP), point A is 2’-3” away from the frontal reference plane.
In the top view drawing, how far will point A be from the frontal reference plane?
In the front view drawing, how far will point A be from the frontal reference plane?
2’-3”
If point A is 2’-3” away from the FRP in the right view, point A will ALWAYS be 2’-3” away from the FRP. A
Communication Technology

2. Do not leave class without homework handout
IOT POLY ENGINEERING
2-10
MULTI-VIEW 2
Frontal Reference Plane
Front View
Horizontal Reference Plane
Top View
Profile Reference Plane
Side View
Do not leave class without homework handout
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

3. MULTI-VIEW 2-10 2 TYPE 2: MULTI-VIEW Reference Planes:
IOT POLY ENGINEERING
2-10
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

4. MULTI-VIEW 2-10 2 Reference Planes:
IOT POLY ENGINEERING
2-10
MULTI-VIEW 2
Reference Planes:
You can also have multiple positions of the same reference planes

5. SECTIONAL VIEWS 2-10 2 Sectional Views TYPE 2: MULTI-VIEW
IOT POLY ENGINEERING
2-10
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

6. SECTIONAL VIEWS 2-10 2 Sectional Views TYPE 2: MULTI-VIEW
IOT POLY ENGINEERING
2-10
SECTIONAL VIEWS 2
Sectional Views
Different materials have different sectional views
TYPE 2: MULTI-VIEW

7. SECTIONAL VIEWS 2-10 2 Examples TYPE 2: MULTI-VIEW
IOT POLY ENGINEERING
2-10
SECTIONAL VIEWS 2
Examples
TYPE 2: MULTI-VIEW

8. IOT POLY ENGINEERING
2-10
AUXILIARY VIEWS 2
So far, our standard 6 views are all visible using the three regular planes of projection
Frontal Reference Plane
Horizontal Reference Plane
Profile Reference Plane
Those views are drawn TRUE SIZE
However, inclines (slants) are not shown as true size in standard views.
TYPE 2: MULTI-VIEW

9. IOT POLY ENGINEERING
2-10
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

10. AUXILIARY VIEWS Which Reference Plane? 2-10 HRP ARP PRP FRP 2
IOT POLY ENGINEERING
2-10
AUXILIARY VIEWS 2
The ARP shows true form (shape and size) for inclines
Which Reference Plane?
HRP
Auxiliary Reference Plane
ARP
TYPE 2: MULTI-VIEW
PRP
FRP

11. IOT POLY ENGINEERING
2-10
SURFACE DEVELOPMENTS 2
TYPE 2: MULTI-VIEW

12. SURFACE DEVELOPMENTS 2-10 2 Stretchout Pattern Development
IOT POLY ENGINEERING
2-10
SURFACE DEVELOPMENTS 2
Stretchout Pattern Development
Used by many industries:
Pipes and ducts
Aircraft and automobile parts
Storage tanks
Cabinets
Boxes and cartons
Packages
Packaging is a very large industry that uses surface developments.
TYPE 2: MULTI-VIEW

13. IOT POLY ENGINEERING
2-10
WORKING DRAWINGS 2
Tells all that needs to be known for making a single part or a complete machine or structure
Precise size and shape
What materials are used
How finishing should be done (roughness/smoothness)
Degree of accuracy (% Error allowed)
TYPE 2: MULTI-VIEW

14. IOT POLY ENGINEERING
2-10
PICTORIAL DRAWINGS 3
Pictorial drawings show a likeness (shape) of an object as viewed by the eye.
TYPE 3: PICTORIAL

15. ISOMETRIC 2-10 3 TYPE 3: PICTORIAL From Greek: Equal Measure
IOT POLY ENGINEERING
2-10
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

16. PERSPECTIVE 2-10 3 TYPE 3: PICTORIAL
IOT POLY ENGINEERING
2-10
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

17. OBLIQUE 2-10 3 A way of showing depth, like isometric
IOT POLY ENGINEERING
2-10
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

18. IOT POLY ENGINEERING
2-10
EXPLODED ASSEMBLY 3
Take an object and separate into individual parts
Usually employed in instruction manuals
Typically drawn in parallel projection (notice there is no perspective in the examples below)
TYPE 3: PICTORIAL

19. CUT-AWAY PICTORIAL 2-10 3 Show the interior details of a product
IOT POLY ENGINEERING
2-10
CUT-AWAY PICTORIAL 3
Show the interior details of a product
Often employed in instruction manuals
Assists in understanding operation of product
TYPE 3: PICTORIAL

20. HOMEWORK Complete the orthographic projection
IOT POLY ENGINEERING
2-10
HOMEWORK
Complete the orthographic projection
worksheet, front and back
Communication Technology