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
•Drawings are more Accurate
•Ease of modification / edit drawings
•Standardisation of drawings
•Drawings can be sent over large
distances using e-mail.
•Ability to use a library of commonly used
shapes/drawings.
COMPUTER AIDED DRAWING
•Initial cost of hardware and software
•Need to re-train staff
•Computers may crash and drawings are lost
•Security of files; files may be hacked
•Need to update software
COMPUTER AIDED DRAWING
These commands draw
arcs, boxes, circles and
ellipses quickly and
accurately.
Arc
Common CAD Commands
Circle
before
after
before
Ellipse
Box
before
after
after
before
after
COMPUTER AIDED DRAWING
Common CAD Commands
Text
before
after
This command allows to
add text or writing to a
CAD drawing For example
adding the labels to
views.
COMPUTER AIDED DRAWING
Common CAD Commands
Fillet
before
after
Chamfer
before
after
The fillet and chamfer are
editing commands which
allow you to create
angled (chamfered) and
rounded (filleted)
corners.
COMPUTER AIDED DRAWING
Common CAD Commands
Trim/Break
before
The trim/break command
allows to remove part of a
line or object.
after
COMPUTER AIDED DRAWING
Common CAD Commands
Copy
before
after
The copy command
allows you to create
duplicates of an drawing
or image without having
to draw the image each
time.
COMPUTER AIDED DRAWING
Common CAD Commands
Mirror
before
axis
after
The mirror command
creates a mirror image
copy of an object about a
specified axis.
COMPUTER AIDED DRAWING
Common CAD Commands
Zoom/Scale
before
The zoom/scale
command allows the user
to reduce or enlarge the
size of an object.
after
COMPUTER AIDED DRAWING
Common CAD Commands
Rectangular Array
before
The array commands
creates multiple copies of
an object in circular or
rectangular arrangements.
after
Polar Array
before
after
COMPUTER AIDED DRAWING
Common CAD Commands
Hatch/Pattern Fill
before
after
The hatch/pattern fill
command inserts a range
of line patterns to specified
areas within a
drawing/object.
COMPUTER AIDED DRAWING
Common CAD Commands
Delete
before
The delete command as the
name suggests, removes a
line or selected object.
after
COMPUTER AIDED DRAWING
Common CAD Commands
rotate
before
The rotate command allows
you to turn an object or
drawing through a
specified angle.
after
COMPUTER AIDED DRAWING