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
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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?