1. COMPUTER AIDED DRAWING
Computer Aided Drawing (CAD) is where we produce our 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.
2. 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.
3. 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
4. COMPUTER AIDED DRAWING
Common CAD Commands
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Circle
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Box
These commands draw
arcs, boxes, circles and
ellipses quickly and
accurately.
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Ellipse
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Arc
5. COMPUTER AIDED DRAWING
Common CAD Commands
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Text
This command allows to
add text or writing to a
CAD drawing For example
adding the labels to
views.
6. COMPUTER AIDED DRAWING
Common CAD Commands
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Fillet
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Chamfer
The fillet and chamfer are
editing commands which
allow you to create
angled (chamfered) and
rounded (filleted)
corners.
7. COMPUTER AIDED DRAWING
Common CAD Commands
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Trim/Break
The trim/break command
allows to remove part of a
line or object.
8. COMPUTER AIDED DRAWING
Common CAD Commands
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Copy
The copy command
allows you to create
duplicates of an drawing
or image without having
to draw the image each
time.
9. COMPUTER AIDED DRAWING
Common CAD Commands
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Mirror axis
The mirror command
creates a mirror image
copy of an object about a
specified axis.
10. COMPUTER AIDED DRAWING
Common CAD Commands
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Zoom/Scale
The zoom/scale
command allows the user
to reduce or enlarge the
size of an object.
11. COMPUTER AIDED DRAWING
Common CAD Commands
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Rectangular Array
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Polar Array
The array commands
creates multiple copies of
an object in circular or
rectangular arrangements.
12. COMPUTER AIDED DRAWING
Common CAD Commands
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Hatch/Pattern Fill
The hatch/pattern fill
command inserts a range
of line patterns to specified
areas within a
drawing/object.
13. COMPUTER AIDED DRAWING
Common CAD Commands
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Delete
The delete command as the
name suggests, removes a
line or selected object.
14. COMPUTER AIDED DRAWING
Common CAD Commands
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rotate
The rotate command allows
you to turn an object or
drawing through a
specified angle.
