2. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
What are the “C”, “A”, and “D”?
CAD Stands for One of
• Computer Aided Design
– The More Typical Definition
• Computer Aided Drafting
Sometimes See CADD or CAE
• Computer Aided Drafting & Design
– Covers Both Bases
• Computer Aided Engineering
– Typically CADD + Numerical-Analysis
3. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Elements of a CAD System
Computer; e.g., DeskTop PC
Input Devices; e.g., mouse, KeyBd
OutPut Devices; e.g., Plotter, Printer
Operating Software; e.g. WindowsXP,
Mac OSX, Unix, Linux
CAD/CAE Application Software
• e.g., AutoCAD, TurboCAD, ProE,
SolidWorks, many others
4. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
CAD Software
Common Basic Elements
• Commands to generate geometry
– Makes Mathematically Accurate Lines, Curves,
Surfaces, Volumes, etc.
• Functions for controlling views
• Modifiers for changing drawing geometry
• Annotation commands for adding text,
dimensions, and notes
The use of CAD has Revolutionized
Engineering Graphics
5. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Rm 1618 CAD Lab
Room 1618 Contains the Computers
and AutoCAD2006 Software
The CADLab Operates in OPEN
Fashion
• ENGR22 Students can Use it AnyTime
it is Open
• ENGR22 Students Do NOT have Priority
over other Users
– except During ENGR22 Lab when ENGR22
Has Top Priority
6. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Rm 1618 CAD Lab cont
The “OnDuty” CADLab Supervisor Can
Assist with OPERATION of the Lab,
Computers or AutoCAD
• e.g., He/She can show you how toTurn on
AutoCAD, print, etc.
• He/She May NOT be able to help with
questions related to Course CONTENT
BMayer on OnDuty per Syllabus
• CAN Assist with Course Content
11. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
ToolBars Described
AutoCAD ToolBars Behave in the Same
Manner as other Windows-Apps ToolBars
Each Icon is
called a “Tool”
Allowing the Cursor to
“Linger over a Tool
Brings up a Descriptive
“ToolTip”
12. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Start a NEW Drawing
Start a New Drawing
by One of
• PullDown Menus:
File → New...
• Using the “QNew”
(QuickNew) Tool
• Type “new” in the
Command Line
13. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Select Template Dialog-Box
• Appears After the
New File
Command(s)
• A Template is a
Standard format
• For Now Suggest
Using the
acad.dwt
Template
• Click Open to Start
the New Drawing
14. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Name & Save Drawing
Opening a NEW
Drawing Results in a
Default Name of
DrawingN.dwg
Use File → Save or
The Save-Tool to
Give the Dwg a new
Name
Naming AutoCAD Files
• NOT Case Sensitive
• Any Combination of
Letters and Numbers
– Also Allowed = $, -, _
• Not Allowed = , /, %, *
15. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
AutoCAD Drawing Units
“ACAD” Has Five
Unit-Systems
• Each has Five
Formatting
Parameters
To Adjust the Unit
System Use the
PullDown Menu
• Format → Units...
16. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Format Units
The Drawing Units
Dialog Box
In ENGR22 We will
Typically Use for
Length Units
• Type → Decimal
• Insertion Scale →
one of
– Inches (in or “)
– Millimeters (mm)
• Precision
– in → 0.00 or 0.000
– mm → 0 or 0.00
18. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Standard Paper Sheet Sizes
USA Standards (in)
• A = 8.5x11 (1.29 AR)
• B = 11x17 (1.55 AR)
• C = 17x22 (1.29 AR)
• D = 22x34 (1.55 AR)
• E = 34x44 (1.29 AR)
Notes
• Nice, Round No.s
• Inconsistent Aspect
Ratios (ARs)
ISO 216 Paper (mm)
• A4 = 210x297 (1.41 AR)
• A3 = 297x420 (1.41 AR)
• A2 = 420x594 (1.41 AR)
• A1 = 594x841 (1.41 AR)
• A0 = 841x1189 (1.41 AR)
Notes
• UNround Numbers
• Constant Aspect Ratio =
2
19. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Drawing Limits
In ENGR22
HardCopy Output
will done on “A-size”
(8.5” x 11”) Paper
ACAD Drawing
Limits set the
Boundaries
• The “Limits” Usually
Set to Match the
Paper Size
Example: Set
Drawing Limits
1. Open a New
Drawing using
acad.dwt
2. Use the PullDown
Menu: Format →
Drawing Limits...
20. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Drawing Limits cont
– Brings up notation in
Command Line
3. Accept the Lower-
Left at <0.0000,
0.000> by hitting
Enter
– Brings the Next
Query into the
Command Line
4. Enter 11, 8.5 and
hit Enter to set the
Upper Right Limit
21. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Grid & Snap
Grid is just a visual
aid for your drawing
Snap allows you to
specify precise
coordinates when
using the mouse
They are modified
with the GRID and
SNAP commands
Neither affect
anything already
drawn
They can be
changed on-the-fly
Function keys set
GRID and SNAP
“modes”: on and off
F7 - Sets GRID
mode on/off
F9 - Sets SNAP
mode on/off
23. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Example → 1st Drawing
1. Fire up AutoCAD
2. Make a new
Drawing using
acad.dwt
3. Save the File as
YourName-01.dwg
• e.g.; BMayer-
01.dwg
4. Make a NEW
LAYER Called
“Object”
Click
25. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
1st Drawing cont
• Set the “Object”
Layer to Current
Double click the
“Status” box
• Set the “Object”
Layer to Current
using Status box
• Click OK
6. Use the drawing
Tools to make
some Shapes &
Lines that Fill a
significant Portion
of the screen
5. Hit the Save tool
27. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
1st Drawing cont
7. Use the Pull Down Menu:
Draw → Text → Multiline
Test...
8. Drag the mouse to
• form an “MTEXT” Box
• Activates the
“Text Formatting” Box
9. In the Format Box Change
the Text Size to 15-25
• Or Whatever fits your dwg
29. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
1st Drawing cont
10.Click in Inside the MTEXT
Box and Type Your HW-ID
• Fname Lname
• Date
• Class ID = ENGR22
• HW ID = HW-nn
11.Click OutSide the MTEXT
Box to DeActivate
12.Hit Save, yet again
30. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
1st Drawing cont
13.In the Command Line type zoom,
then Hit Enter
14.At the Query Prompt the letter “e”
(for “extents”) Then Hit Enter
Your Drawing will Zoom in to Fill the Screen
33. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
1st Drawing cont
ASK the CAD-Lab
Supervisor about
the PROPER
Settings to Obtain
an A-Size (8.5x11)
PrintOut
16.In the Print Dialog
Box click OK
17.Pick up your Copy
and you’re done
35. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Appendix
6
9
7
2 2
3
x
x
x
x
f
Engineering 22
36. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
ISO 216 Paper Size System
In the ISO paper size system, the height-to-width ratio of all pages is the square root of
two (1.4142 : 1). This aspect ratio is especially convenient for a paper size. If you put two
such pages next to each other, or equivalently cut one parallel to its shorter side into two
equal pieces, then the resulting page will have again the same width/height ratio.
The ISO paper sizes are based on the metric system. The square-root-of-two ratio does
not permit both the height and width of the pages to be nicely rounded metric lengths.
Therefore, the area of the pages has been defined to have round metric values.
• The height divided by the width of all formats is the square root of two (1.4142).
• Format A0 has an area of one square meter.
37. BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
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Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Comments Viewing AR’s
Humans have Much Greater Lateral
Peripheral Vision than Vertical
• Suggests that “Wide Screens” Are Better
Some Viewing Aspect Ratios
• 1.25:1 = 8x10 photo
• 1.33:1 = NTSC TV Screen
• 1.78:1 = HDTV (Movie Compatible)
• 1.85:1 = “Academy Flat” Movie
• 2.35:1 = “Panavision” Movie
Editor's Notes
Computer Aided (or Assisted) Design or Drafting. It means using computers to design products or architecture. Sometimes CAD output is sent directly to operate the machinery that makes the product; this is called Computer Aided Manufacturing. See CAM.