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Orthographic Projection: Orthographic Projection:

Orthographic Projection: - PowerPoint Presentation

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Orthographic Projection: - PPT Presentation

an i ntroduction What is Orthographic Projection Orthographic Projection Lesson Objectives By the end of the lesson Everyone will be able to produce a simple 3 rd Angle Orthographic ID: 323305

view orthographic angle projection orthographic view projection angle front drawing object plan hidden line side shown dimensions isometric drawings included detail scale

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Slide1

Orthographic Projection:anintroduction

What is

Orthographic

Projection?Slide2

Orthographic ProjectionLesson ObjectivesBy the end of the lesson:Everyone will be able to produce a simple 3rd

Angle Orthographic

drawing

.

Most

will be able to identify the 3

rd

Angle

Orthographic.

Some

will understand

hidden detail

lines and their use.

Slide3

Orthographic ProjectionThird Angle Orthographic Projection is the most common method of producing a working drawing, made by creating at least three separate 2D views of an object:

Front view

Plan view (above or birds-eye)

End or side view

But what does this look like?

Slide4

Orthographic ProjectionLike this..See it’s easy, now your turn. No? Too complex? Slide5

Orthographic Projection

Imagine you are viewing an object in a glass box, like this TV for example.

Let me explain…Slide6

Orthographic Projection

Let me explain…

If you view the TV from this angle, what would you see?Slide7

Orthographic Projection

Let me explain…

This is what you would see and this is the

FRONT VIEW

.Slide8

Orthographic Projection

Now view the TV from this angle, what would you see? The

PLAN

or

BIRDS EYE VIEW

.Slide9

Orthographic Projection

And finally view the TV from this angle, what would you see? The

END

or

SIDE VIEW

.Slide10

Orthographic Projection

Now imagine you could open up the glass box and see all three images in the

exact

2D format and scale you have been looking at each one.Slide11

Orthographic Projection

Now imagine you could open up the glass box and see all three images in the 2D format and scale you have been looking at each one.

You would have all three 2D drawings on a single plane or surface, creating a

THIRD ANGLE ORTHOGRAPHIC DRAWING

. This is what you would see. Slide12

Orthographic ProjectionFront View

Plan View (Top)

End View (Side)

Now look at this example using a set of steps, I have included the dimensions on the

ISOMETRIC DRAWING

.

Front ViewSlide13

Orthographic ProjectionFront View

Plan View (Top)

End View (Side)

Now look at this example using a set of steps, I have included the dimensions on the

ISOMETRIC DRAWING

.

Note how the three drawings are laid out, all in line with each other and each has been drawn to scale.Slide14

Orthographic ProjectionFront View

Plan View (Top)

End View (Side)

Now look at this example using a set of steps, I have included the dimensions on the

ISOMETRIC DRAWING

.

Note how the three drawings are laid out, all in line with each other and each has been drawn to scale.

All of this means the drawing meets the required standard and should have the symbol for

3

RD

ANGLE ORTHOGRAPHIC

PROJECTION

.Slide15

Orthographic ProjectionThis is the symbol for Third Angle Projection drawings and you need to remember it.

It is showing that we project our images to the right of the planSlide16

Orthographic ProjectionNow it’s your turn. In your books go to a new page and in a landscape format sketch freehand the shape shown below in the top right hand corner of your page. You have three minutes.Slide17

Orthographic ProjectionNow using your knowledge create a Third Angle Orthographic Projection drawing of the object, the arrow indicates the front view and again this should be done freehand. You have five minutes to complete the work.

Plan View

Front View

End ViewSlide18

Orthographic ProjectionSo how did you do? Does your drawing look like the one below? Do the three 2D drawings line up correctly? Have you created a Third Angle Orthographic Projection? Did anyone draw the hidden detail line?

Plan View

Front View

End ViewSlide19

Orthographic ProjectionOn a Third Angle Orthographic Projection there may often be

hidden details

, this is shown with a dotted line and indicates where features of

an object are that can not be seen in a particular 2D view but which are important when manufacturing the object

.Slide20

Orthographic ProjectionOn a Third Angle Orthographic Projection there may often be

hidden details

, this is shown with a dotted line and indicates where features of an

object are that can not be seen in a particular 2D view but which are important when manufacturing the object

.

The recess shown in the

isometric drawing

can only be seen in the plan and side view but

not

in the front view.Slide21

Orthographic ProjectionOn a Third Angle Orthographic Projection there may often be

hidden details

, this is shown with a dotted line and indicates where features of an object are that can not be seen in a particular 2D view but which are important when manufacturing the object.

The recess shown in the

isometric drawing

can only be seen in the plan and side view but

not

in the front view.

This

hidden detail

is always shown and

is done so using a dotted line in the correct location.Slide22

Orthographic ProjectionNow using your knowledge, create a third angle orthographic projection drawing of the object you have been given.

Front View

Please note the front view.

And this time you will draw the object to

scale

using

grid paper

and a ruler.

You

have

ten

minutes

to complete the drawing.Slide23

Orthographic ProjectionSo how did you do? Are all the dimensions correct? Have you included all the hidden detail?Slide24

Orthographic ProjectionNow lets make things a little harder, you have been given a new object to draw.

Front View

You have

10 minutes

to complete this drawing.

Please note the diameter of the hole is

10mm

and it is centrally located.Slide25

Orthographic Projection

So how well did you do this time? Are all the dimensions correct again? Have you included all the hidden detail this time? Is the hole the right diameter?Slide26

Orthographic ProjectionHave you achieved the main learning objective? Are there any questions?