Engr 22 lec-02-sp07_acad_intro

BMayer@ChabotCollege.edu • ENGR-22_Lec-02_ACAD_Intro.ppt
1
Bruce Mayer, PE
Engineering 22 – Engineering Design Graphics
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22
Introduction to
AutoCAD©

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
Starting AutoCAD
 Turn on one of the
rm1618 Computers
 DoubleClick the
AutoCAD Icon
 Should Bring Up the
AutoCAD WorkSpace

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Bruce Mayer, PE
AutoCAD WorkSpace
Status Line
CoOrd Display
Command Line
Cursor
Object
Properties TB
Standard TB
PullDown Menus
Drawing TB
Layer TB
Modify TB
Drawing
Area

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Bruce Mayer, PE
AutoCAD ToolBars: Move/Size
 ACAD ToolBars Can
Moved and Sized using
the Same Techniques as
with other MSWindows
Applications

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Bruce Mayer, PE
ReSize CommandLine Box
Resize Using
Double-Bar Cursor
Recommend
Minimum 2-Lines
High

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Bruce Mayer, PE
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”

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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 = , /, %, *

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Bruce Mayer, PE
AutoCAD Drawing Units
 “ACAD” Has Five
Unit-Systems
• Each has Five
Formatting
Parameters
 To Adjust the Unit
System Use the
PullDown Menu
• Format → Units...

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Bruce Mayer, PE
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

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Bruce Mayer, PE
Format Units cont
 In ENGR22 We will
Typically Use for Angle
Units
• Type → Decimal Degree
• Precision → 0 or 0.0
• CounterClockwise

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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...

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
Grid & Snap
 acadiso.dwt
• Limits (420,297)
 Grid set to 10 mm
 Snap set to 20mm

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Bruce Mayer, PE
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

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Bruce Mayer, PE
1st Drawing cont
• Pick the GREEN Box
and then click OK
Type “Object”
Click
“Color →
white”

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Bruce Mayer, PE
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

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Bruce Mayer, PE
1st Drawing cont
Drawing
ToolBar
Save Again

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Bruce Mayer, PE
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

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Bruce Mayer, PE
1st Drawing cont
MTEXT
Box
Change to 25

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Bruce Mayer, PE
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

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Bruce Mayer, PE
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

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Bruce Mayer, PE
1st Drawing cont
zoom → extents

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Bruce Mayer, PE
1st Drawing cont
15.Use the PullDown
Menu:
File → Plot
• Activates the Plot
Dialog Box

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Bruce Mayer, PE
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

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Bruce Mayer, PE
All Done for Today
See Me in
rm 1618 Lab
For Plotting
Tutorial

35
Bruce Mayer, PE
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Appendix
  6
9
7
2 2
3



 x
x
x
x
f
Engineering 22

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Bruce Mayer, PE
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.

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Bruce Mayer, PE
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

Engr 22 lec-02-sp07_acad_intro

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