IOT POLY ENGINEERING 2-10 A In the right view of the drawing below (PRP), point A is 2-3 away from the frontal reference plane. 1.In the top view drawing,

IOT

POLY ENGINEERING2-10

A

• In the right view of the drawing below (PRP), point A is 2’-3” away from the frontal reference plane.1. In the top view drawing, how far will point A be from

the frontal reference plane?2. In the front view drawing, how far will point A be from

the frontal reference plane?

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DRILLOctober 10, 2008

1) 2’-3”

2) 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.

IOT

POLY ENGINEERING2-10

– 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?

Do not leave class without homework handout

IOT

POLY ENGINEERING2-10

• 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 ENGINEERING2-10

• Reference Planes:– You can also have multiple positions of the same

reference planes

MULTI-VIEW

IOT

POLY ENGINEERING2-10

• 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 ENGINEERING2-10

• Sectional Views– Different materials have different sectional views

SECTIONAL VIEWSTY

PE 2

: MU

LTI-V

IEW

IOT

POLY ENGINEERING2-10

• Examples

SECTIONAL VIEWSTY

PE 2

: MU

LTI-V

IEW

IOT

POLY ENGINEERING2-10

• 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.

AUXILIARY VIEWSTY

PE 2

: MU

LTI-V

IEW

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

AUXILIARY VIEWSTY

PE 2

: MU

LTI-V

IEW

FRP

HRP

PRP

• Neither the front, top, or side view shows the true size and shape of the object’s inclined surface.

IOT

POLY ENGINEERING2-10

AUXILIARY VIEWSTY

PE 2

: MU

LTI-V

IEW

FRP

PRP

Which Reference Plane?HRP

ARPAuxiliary Reference Plane

The ARP shows true form (shape and size) for inclines

IOT

POLY ENGINEERING2-10

TYPE

2: M

ULT

I-VIE

WSURFACE DEVELOPMENTS

IOT

POLY ENGINEERING2-10

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: M

ULT

I-VIE

WSURFACE DEVELOPMENTS

IOT

POLY ENGINEERING2-10

• 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: M

ULT

I-VIE

WWORKING DRAWINGS

IOT

POLY ENGINEERING2-10

• Pictorial drawings show a likeness (shape) of an object as viewed by the eye.

PICTORIAL DRAWINGSTY

PE 3

: PIC

TORI

AL

IOT

POLY ENGINEERING2-10

ISOMETRICTY

PE 3

: PIC

TORI

AL

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

PERSPECTIVETY

PE 3

: PIC

TORI

AL

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

OBLIQUETY

PE 3

: PIC

TORI

AL

IOT

POLY ENGINEERING2-10

• 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)

EXPLODED ASSEMBLYTY

PE 3

: PIC

TORI

AL

IOT

POLY ENGINEERING2-10

• Show the interior details of a product• Often employed in instruction manuals• Assists in understanding operation of product

CUT-AWAY PICTORIALTY

PE 3

: PIC

TORI

AL

IOT

POLY ENGINEERING2-10

Complete the orthographic projection worksheet, front and back

HOMEWORK

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