COMPUTER AIDED DRAWING

COMPUTER AIDED DRAWING
Computer Aided Drawing (CAD) is where we produce our
orthographic and 3D drawings using a computer software
package. CAD has many advantages and disadvantages over
traditional drawing on a drawing board with a pencil. Below
is an example of a CAD drawing.
This graphic shows
an example of a 3D
drawing which was
created as a line
drawing and then
rendered.

COMPUTER AIDED DRAWING

COMPUTER AIDED DRAWING

COMPUTER AIDED DRAWING
In the final examination, you may be asked
how to create an object using a CAD package.
You may be given a blank box for example and
asked how to create the finished item. Below is
an example of a typical exam question.
Using appropriate
terminology explain
how we could turn
the blank box on
the left into the
remote control on
the right.
SONY

COMPUTER AIDED DRAWING
TEXT Select the ‘draw’ menu and select text editor.
Click roughly where you want the text to be and
the text box will appear. Type in SONY and
select bold. Click OK and the text will appear.
BUTTONS Select the ‘draw’ menu and click on draw
box, draw a box the suitable size. Select
the modify menu and click on box array.
Select 4 rows and 4 columns to make your
buttons. Click OK and your buttons will
be there.
SONY

COMPUTER AIDED DRAWING
CIRCLE Select the ‘draw’ menu and click on the draw
circle icon. Click on where you want the circle
to be. Either move your mouse to determine the
radius or type in your radius.
CORNERS Select the modify menu from the tool bar
and click on fillet. Select each individual
side to fillet and it should automatically
curve for you. Double click and alter the
fillet radius if it is not suitable.
SONY

COMPUTER AIDED DRAWING
The FILLET tool allows
you to curve or put a
rounded corner on a
drawing. You can change
the radius of the FILLET
to suit the drawing.

COMPUTER AIDED DRAWING
The GRID on a CAD drawing is an imaginary network of dots on
the sheet which you are working on. The spacing of the dots can be
set to various sizes depending on your requirements. When you
SNAP to the grid this means you can only work on the predetermined
grid of dots you specified hence, improved speed and
accuracy. This allows all lines to be perfectly horizontal and
vertical if this is what you need.
The GRID and the SNAP function can be switched on and off as
required at any time.

COMPUTER AIDED DRAWING
The COPY and PASTE
functions can save you a
lot of time. If you have
many buttons to draw on
a calculator for instance,
you can simply draw one
button then COPY and
PASTE it repeatedly,
hence only drawing the
button once as opposed to
twenty or thirty times.

COMPUTER AIDED DRAWING
The ZOOM icon allows you to take a very close look
at minute detail on your CAD drawing. Very often the
screen may be set to allow you to see the whole page.
This does not allow you to work precisely and you
would have to use the ZOOM tool to take a very close
look at an area to work on.
You would then be able to add much more detail to
your drawing. You can ZOOM in and out of the
drawing at any time.
USEFUL PRESENTATIONS
Behind every orange box on this page is a presentation which you should watch. They
will help you in a couple of ways.
They could be used to confirm that your understanding of a topic is correct.
They could also be used to guide you in the topics which you found difficult in class
the first time round. They are designed as self help. Go through them slowly and if you
still don’t get it, go back to your teacher as soon as possible.
CAD CAG Hardware Software Processes 3D Models
Isometric Intro Iso Info Iso Circles
Cylinders & Cones
Oblique Intro
Oblique Projection
Sectional Views
Planometric Intro Plano - Method
Exploded Views
Orthographics
Assemblies
One Point Perspective
Signs & Symbols
Two Point - Intro Examples Method
Line Types
Square Pyramids
Graphs & Charts
Colour Theory
Click on a square . . .
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