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ENGT 122 – CAD I. CAD I – Outline & Chapter 1 – Intro to AutoCAD & Chapter 2 – Getting Started with Auto-CAD. CAD I - Outline. Chap 1 – Introduction to AutoCAD Chap 2 – Getting Started Chap 3 – Drawing Commands Chap 4 – Drawing Aids Chap 5 – Editing Commands

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engt 122 cad i

ENGT 122 – CAD I

CAD I – Outline

&

Chapter 1 – Intro to AutoCAD

&

Chapter 2 – Getting Started

with Auto-CAD

cad i outline
CAD I - Outline
  • Chap 1 – Introduction to AutoCAD
  • Chap 2 – Getting Started
  • Chap 3 – Drawing Commands
  • Chap 4 – Drawing Aids
  • Chap 5 – Editing Commands
  • Chap 6 – Editing with Grips
  • Chap 7 – Controlling Drawing Display & Creating Text
  • Chap 13 – Hatching
  • Chap 14 – Blocks
outline chapter 1 intro to autocad chapter 2 getting started
Outline Chapter 1 –Intro to AutoCADChapter 2 - Getting Started
  • CAD Intro
  • Starting and Stopping AutoCAD
  • File Commands (Saving, Opening, Closing)
  • Command input Methods
  • Coordinates - Systems & Input Methods
  • Drawing Simple Objects (Lines, Circles)
  • Modifying Objects (Erase, Undo, Move)
  • Display Commands (Zoom, Pan)
  • Basic Plotting
  • Help System
what is cad
What is CAD?

Googlism– When this question was posed to Google (the popular internet search engine) this is how it responded:

*cad is heading for the future cad is creative cad is more than a machine shop*cad is info database and analyzer cad is changing how we handle this essential building design phase*cad is a designer’s paradise*cad is expensive but becomes more widely available cad is a polygon editing program for 3d professionals and hobbyists*cad is fun*cad is more than just a visual tool cad is perceived cad is different*cad is increasingly more powerful and capable

*cad is very powerful and fairly intuitive

*cad is a powerful engineering drawing tool Etc……..

what is cad really
What is CAD?… Really!
  • CAD stands for Computer-Aided Design/Drafting.
  • It involves inputting lines, arcs, dimensions, and text, not onto paper, but into an electronic database for engineering purposes and in compliance with specific industry standards.
  • The ability to manipulate graphical data in many ways during and after completion of any job.
  • There are many types of CAD systems and brand names, but you can break it down into 2D and 3D. In this Program we use AutoCAD 2007 for 2D and Inventor11 for 3D.
cad advantages
CAD Advantages
  • CAD software is more accurate.
  • Lines are crisp and clean.
  • Text is legible (usually).
  • Erasures are undetectable.
  • More productive.
  • Repetitive operations can be performed with a single command.
  • Symmetrical parts are easily replicated.
  • Editing drawings is much easier.
  • Drawing can be transferred electronically.
  • Storage requirements are minimal.
  • Drawing retrieval process is much easier.
  • Data is reusable.
  • What else?
what is autocad
What is AutoCAD?
  • AutoCAD is an interactive general purpose CAD (Computer Aided Drafting) program.
  • Developed in California in the early 1980’s by Autodesk Inc.
  • Used in many disciplines: mechanical, civil, architectural, electrical, etc.
  • Performs 2D drafting, 3D wireframe, and 3D solid modeling.
  • Functionality is extremely comprehensive to suit various needs. Difficulty ranges from very easy to very complex, depending on user requirements.
  • The world’s most popular PC-based design software. By knowing AutoCAD, you are more likely to get hired!
create a working folder
Create a Working Folder

To help keep your workspace and folders “clean” we will create

a working folder for use during CAD I lectures:

  • Login to your computer.
  • Create a folder called CAD I in your home work space on U: drive (U: MECH##).
  • Under CAD I create a subfolder called CAD I-Lecture

(U: MECH##/CAD I/ CAD I-Lecture).

  • This is the space where lecture exercises should be saved and stored.
  • Your other CAD I files can be saved in other folders which YOU create under (U: MECH##/CAD I/).
slide11
Demo
  • Show demo of suggested file folder structure.
starting autocad
Starting AutoCAD

3 ways to start AutoCAD:

  • Double-Click AutoCAD 2007 icon on your desktop.
  • Use the Start Menu –

Start > All Programs > Autodesk > AutoCAD 2007 > AutoCAD 2007

  • Double-Click an AutoCAD .dwg file in Windows Explorer.

AutoCAD

Icon

slide13
Starting AutoCAD

Double-Click AutoCAD Icon

Start Menu Method

Doubleclick Demo1.dwg

Explain doubleclick on files if previous version of AutoCAd was used most recently.

Demo
shutting down autocad
Shutting Down AutoCAD
  • If you intend to keep the drawing data be sure you SAVEbefore exiting!
  • Exiting AutoCAD:
    • From Drop Down Menu: File > Exit
    • Or click  in upper right corner.
    • Or type EXIT at command prompt followed by [Enter].

To Exit AutoCAD

To Exit AutoCAD

exercise
Exercise:
  • Start AutoCAD 2007 by double-clicking the icon.
    • Examine the layout
    • Inform your instructor of any problems!
  • If you get a Startup Dialog Box,

click Cancel with your left mouse button.

  • Exit AutoCAD using the drop down menu.
    • DO NOT save your drawing!
  • Restart AutoCAD using the Start Menu.
  • Exit AutoCAD using the Exit command.
  • Restart AutoCAD by double-clicking the icon.
  • Exit AutoCAD by clicking upper right .
startup dialog box
Startup Dialog Box
  • Options;
    • Startup Dialog Box
    • No Startup Dialog Box
  • Options Selected by;
    • Tools > Options > System >

General Options > Startup

Startup Dialog Box

slide17
Show Startup dialog box.

Demonstrate changing Startup dialog box.

Tools > Options > System > General Options > Startup

Set to show Startup Dialog Box.

Demo
exercise1
Exercise:
  • Start AutoCAD by double-clicking the icon.
    • Examine the Startup dialog box (if you get one).
    • Close the Startup dialog box (if you get one) by clicking Cancel with your left mouse button.
  • Reset the system to either “Show a startup” (if you did not get one) or “Don’t show a startup” (if you did get one).
    • Tools > Options > System > General Options > Startup
  • Exit AutoCAD. DO NOT save your drawing!
  • Restart AutoCAD and verify that the system reset according to your expectations.
  • Finish the exercise by resetting the system so that you Do get a Startup dialog box, then exit AutoCAD using the Exit command.
startup dialog box explanation
Startup Dialog Box Explanation
  • Options:
    • Open a Drawing
    • Start from Scratch
      • Imperial
      • Metric
    • Use a Template
    • Use a Wizard
      • Advanced Setup
      • Quick Setup
startup opening a drawing
Startup - Opening a Drawing
  • Shows most recently modified drawing files.
  • Browse Button – to access other drawing files in directory structure.
  • AutoCAD drawing files have a unique extension .dwg
    • Example: bracket.dwg or hub.dwg

Most recently modified files

Browse to open other file

startup start from scratch
Startup - Start From Scratch
  • Starts blank drawing file using standard template:
    • Imperial -
      • units = feet and inches
      • Template file = acad.dwt
    • Metric -
      • units = millimeters
      • Template file = acadiso.dwt
  • Templates – standardized file formats with preset internal variables. Provided with AutoCAD or created by user.
    • Limits (drawing length and width)
    • Text Height
    • Dimension Scale
    • Linetype Scale
  • AutoCAD template files have a distinct extension  .dwt
startup use a template
Startup - Use a Template
  • Starts a drawing file using standard AutoCAD or user defined template (.dwt).
  • Drawing settings will match defined template properties.
  • AutoCAD Templates:
    • Standardized formats provided with AutoCAD.
    • Typically found in AutoCAD

subfolder called Templates.

  • User defined templates:
    • Template file containing commonly used settings and objects.
    • Use Browser to locate user template.
startup use a wizard
Startup - Use a Wizard
  • Uses prompted info for drawing setup.
  • Quick Setup Prompts:
    • Units
    • Work area (width & Length)
  • Advanced Setup Prompts:
    • Units
    • Angle
    • Angle Measure
    • Angle Direction
    • Work Area (width & Length)
slide24
Show Startup dialog box options.

Open a Drawing

Start from Scratch

Use a Template

Use a Wizard

Demo
exercise2
Exercise:
  • Start AutoCAD by double-clicking the icon.
  • Examine the Startup dialog box.
  • Start a drawing by using a Wizard with Quick Setup.
  • Exit AutoCAD. DO NOT save your drawing!
  • Restart AutoCAD
  • Start a drawing using Template Ansi a – color dependent plot styles.dwt.
  • Exit AutoCAD. DO NOT save your drawing!
  • Restart AutoCAD
  • Start a drawing by using Start From Scratch with English units.
  • Exit AutoCAD. DO NOT save your drawing!
  • Restart AutoCAD
  • Start a drawing by using a Wizard with Advanced Setup.
saving your work
Saving Your Work!
  • As you work on an AutoCAD drawing, all data for the drawing resides in RAM memory on the computer.
  • If you close the AutoCAD session or some other misfortunate event occurs, ALL DATA WILL BE LOST! AND CANNOT BE RECOVERED! It’s enough to make a grown man (or woman) cry!…that is unless you have SAVED your session!
saving your work1
Saving Your Work!

Top 8 Events that will make you cry!

Accidentally exiting AutoCAD.

AutoCAD bugs.

Failure of Microsoft Windows OS.

Power failure (frequent occurrence).

Unrecoverable error in drawing.

Network issues or shutdown.

Disrupting a network or power cable.

Missing an assignment due to above!

saving your work2
Saving Your Work!
  • *Important – You should save to a folder on your NETWORK drive whenever possible! Network drives are backed up daily and can be recovered in the event of system failure. If you save to your local hard drive and the disk fails you are S.O.L.! If you save to your flash drive and loose it, you are S.O.L.!
  • Hint:No excuses for late assignments unless its due to a network problem!
saving your work3
Saving Your Work!

Smart Save Tips:

  • Save often! – it’s a good idea to save after every major change to a drawing.
  • Create sensible file names that indicate the content.
  • Create a running history of your save files for each particular assignment or project;
    • Ex: Assign1_Bracket A.dwg 1st major save

Assign1_Bracket B.dwg 2nd major save

Etc.

  • Create a logical folder structure to save to;
    • Create folders for each course (Draft I, CAD I, etc)
    • Create subfolders for assignments.
    • Create separate subfolder for class exercises (show subfolder example).
saving your work4
Saving Your Work!
  • Most common ways to Save are the File drop down menu commands:

Save & Save As…

  • First time file is saved, a file name must be supplied. Either command will bring up the “Save As” dialog box for file name entry.
  • Subsequent saves:
    • Save – saves to the existing drawing file name. No prompts or dialog box occurs.
    • Save As - brings up same dialog box. If new name is provided, data is saved to that new file and current drawing session name is updated.
saving your work5

*NOTE: All AutoCAD files have a .dwg extension. This is how you identify them.

Saving Your Work!

Click to browse for a folder

  • Save As Dialog Box:

Selects folder where file is saved

Moves folder up one level.

Pre-existing file name may be selected from this list. File will be overwritten.

Enter file name to save to. Drawing name will update as well.

Not necessary to include .dwg extension. Added automatically.

Click Save after folder and file name are entered

saving your work6
Saving Your Work!
  • Toolbar Quick Save: saves to the existing drawing file name. No prompts or dialog box occurs. Acts identical to Save from drop down menu.
slide34
Save – Drop Down Menu:

Open a new drawing and examine default file name.

Show Save & Save As in drop down menu.

Show First save & subsequent saves.

Demo
opening and closing files
Opening and Closing Files
  • You can open and close files at any time without leaving AutoCAD.
  • Typically, such operations are performed with the File drop down menu.
  • Starts a new file. Initiates Start-Up dialog box (same as when you started AutoCAD).
  • Opens an existing file. Initiates Select-File dialog box. Allows you to browse for desired file.
  • Closes the active session. If the session has not been saved, a prompt to save will be initiated.
slide36
Opening and Closing Files:

Open an existing file.

Open a new file.

Close a file.

Demo
autocad screen layout
AutoCAD Screen Layout

Drop Down Menu

Toolbar Menus

Graphics Window

Curser Crosshair

World CS Origin

Command Window

Environment Tabs

Curser Coordinates

Status Bar Buttons

making autocad do stuff
Making AutoCAD DoStuff
  • AutoCAD uses Commands, Command Data,and System Variables in order to perform a particular function.
  • Commands – user selected instructions telling AutoCAD which operation to perform.
    • Example:Line – creates a line
    • Example: Circle – creates a circle
  • Command Input Data–additionalinput data supplied by the user when issuing a command.
    • Example:End points for creating a line with the Line command
  • System Variables – Internal AutoCAD data settings which determine how a particular AutoCAD command is performed.
command input
Command Input
  • Redundant Commands –
    • A specific command can typically be issued by various methods.
    • Don’t let this confuse you, it simply allows options for you to work in a manner you prefer.
  • Methods for issuing a command:
    • Keyboard / Command Line
    • Drop Down Menus
    • Toolbar Button Menus
  • Be Observant -for all methods the Command Window prompts for command input data, indicates command status, and lists command history.
slide40
Show AutoCAD layout.

Show various methods to issue one command.

Show response in Command Window.

Demo
slide41
Keyboard / Command Line:
  • Type a command at command line prompt Command:followed by [Enter]
  • Command prompt (Command:)must first be displayed, otherwise a previous command is still active.
  • Use [Esc] to cancel previous command.
  • Advantages:
    • Often faster than searching through menus.
  • Disadvantages:
    • Requires memorizing command names.
    • Must switch between mouse and keyboard.

Command history

Command line prompt or data input prompt

slide42
Drop Down Menus:
  • Menus are cascading.
  • Select command with left mouse button.
  • Advantages:
    • Commands and options are listed.
    • Easier for beginners.
  • Disadvantages:
    • Requires memorizing menu structure.
    • Slow to access command.

Arrows indicate additional options or commands

Command history

data input prompt

slide43
Toolbar Menus:
  • Hold mouse pointer over toolbar command to display tool-tip (name of command).
  • Select command icon with left mouse button.
  • Advantages:
    • Quick access to displayed toolbar commands.
    • Easier for beginners.
  • Disadvantages:
    • Requires memorizing icons.
    • Only displayed toolbars are accessible.
    • Not all command options are available.
    • Toolbar menus can get crowded.

Tool-Tip for Line command

Command history

data input prompt

slide44
Toolbar Menus:
  • Toolbar commands are grouped in logical categories;
    • Draw Toolbar,Modify Toolbar,etc.
  • Toolbar menus are configurable;
    • Can be displayed or hidden.
    • Can be reshaped.
    • Can be arranged anywhere on the screen.
  • Toolbar visibility is controlled by;
    • Right mouse click on any toolbar.

Right click on toolbar

slide45
Issue command by keyboard.

Show contents of drop down menus. Issue command by drop down menu.

Show toolbar menus using tool-tips. Issue command by toolbar.

Configure toolbar;

Change visibility

Change location

Change Shape

Demo
toolbar visibility
Toolbar Visibility
  • Typically, toolbar visibility is controlled by a right mouse click on any toolbar.

Q:What if all toolbars are turned off?

A: You must use the –TOOLBAR command.

Command:-TOOLBAR

Enter toolbar name or [ALL]:STANDARD

Enter an option [Show/Hide/Left/Right/Top/Bottom/Float] <Show>:

  • This command is also useful for turning ALL toolbars on (Show) or off (Hide).
slide47
Show –TOOLBAR command.

Turn on (Show) all toolbars.

Turn off (Hide) all toolbars.

Turn on the STANDARD toolbar.

Demo
exercise3
Exercise:
  • Use the –TOOLBAR command to hide all toolbars.Then use the –TOOLBAR command to show only the Standard toolbar.
  • Use right mouse click to display the Dimension toolbar.
    • Move Dimension toolbar to the middle of the screen.
    • Reshape Dimension toolbar until approximately square.
  • Use right mouse click to display the Object Snap toolbar.
    • Embed Object Snap as a vertical column into the menu on the right side of the graphics screen.
  • Display the View and Inquiry toolbars and embed them in the menu under the Standard toolbar.
exercise4
Exercise:

Standard Toolbar

  • Use –TOOLBAR command to first hide all toolbars, and then to show only the Standard toolbar. Place as shown.
  • Display the Draw and Modify toolbars and arrange as shown.
  • This layout will be used for class demonstrations. You should also maintain this toolbar arrangement for the initial portion of the course. We will add additional toolbars as the class progresses.

Draw & Modify

Toolbars

coordinate space
Coordinate Space
  • In AutoCAD, geometry such as lines and circles are created by locating points in space.
  • A Coordinate System is used as a reference for locating such points. In AutoCAD the primary CS is the World Coordinate System.
  • Points can be placed in the WCS using several Coordinate System Input Methods:
    • 2D Rectangular Coordinates
    • 2D Polar Coordinates
    • 3D Cartesian Coordinates
    • 3D Cylindrical Coordinates
    • 3D Spherical Coordinates
coordinate space1

+Y

X

Y

+X

-X

-Y

Coordinate Space

2D Rectangular Coordinates (Cartesian):

  • Plane defined byhorizontalX andverticalY axes.
  • Origin(0,0)is intersection ofXand Yaxes.
  • Xcoordinate measureshorizontaldistance from origin.
  • Ycoordinate measuresverticaldistance from origin.
  • Coordinates of a point are indicated by X, Y pairs.

Ex: -3,5

exercise5
Exercise:
  • What are the X & Y coordinates of point:
    • A
    • B
    • C
    • D
    • E
  • Locate point at:
    • -5, -4
    • 6, 1.8
    • 2.4, -1
    • -5, 4
    • -3,-5

Y

B

E

A

X

D

C

coordinate space2

4.5<60

θ

+

-

Origin

Coordinate Space

2D Polar Coordinates :

  • Alternate method of defining points in an X-Y plane.

Location defined by radial distance from origin and an angle.

  • Radius (R)is the direct radial distance from origin to point.
  • Theta (Ө)is angle between +X axis and radial line to point;
    • Counter-clockwise  about origin is positive angle.
    • Clockwise  about origin is negative angle.
  • Convenient for defining inclined lines & used often in AutoCAD.
coordinate space3
Coordinate Space

Right Hand Rule:

  • Used to determine positive direction of rotation about an axis.
  • Point thumb along positive Z-axis, fingers point to positive rotation.
  • Useful for determining sign of angle in polar coordinate system.
  • *Note - counter clockwise is positive (default positive rotation in ACAD)

Y

Z

X

exercise6
Exercise:
  • What are the Polar coordinates of point
    • A (ex: 630º)
    • B
    • C
    • D
    • E
  • Give approximate Cartesian coordinates for the following points;
    • (490º)
    • (2180º)
    • (4-15º)
    • (6330º)

Y

B

E

A

X

D

C

slide56
AutoCad Coordinate System:
  • Actual 3D Cartesian Coordinate System (X, Y, Z axes).
  • Standard Graphics Screen looks & acts like a 2D Rectangular Coordinate System;
    • X and Y axes shown
    • Z coordinate = 0 (+Z axis directed out from screen).
  • Axes located at bottom left on graphic window.

Positive Y direction

Coordinate Axes

Origin

Positive X direction

drawing lines
Drawing Lines
  • Lines are the most fundamental objects in drafting.
  • We will start by creating straight lines.
  • Several methods for creating straight lines;
    • Command line we will start with this method.
    • Toolbar menu
    • Drop down menu
  • Simultaneously, we will learn some commands for other basic functions which we will need.
drawing lines1
Drawing Lines

Straight Lines – Command Method

Example:

Command: LINE

Specify first point:

Specify next point or [Undo]:

Specify next point or [Undo]:

Specify next point or [Close/Undo]:

Specify next point or [Close/Undo]:

  • Command can be terminated at any time;
    • Press [Enter], [Esc], or [Spacebar].
    • Right click mouse and select Enter or Cancel from pop-up menu.

Input 1st point (mouse pick or typed coordinates).

 Input 2nd point or Undo (allows point to be reselected. Type U then [Enter]).

Input next point, Undo, or Close (draws line from last point to first point forming a closed polygon. Type C then [Enter]).

slide60
Show LINE command (command line & menu)

Show (U)ndo option.

Show (C)lose option.

Show command termination methods.

[Enter],[Esc], or[Spacebar].

Right mouse click. Show escape from previously issued command.

Demo
drawing lines2
Drawing Lines

Straight Lines – Menu Methods

  • The same LINEcommand can be issued by using the Drop Down&Toolbarmenus.

Draw > Line from drop down menu

Line icon from Draw toolbar

drawing lines3
Drawing Lines

Straight Lines – Continue Option

  • If line(s) have been created by executing the LINE command, and a new LINE command is issued, the Continue option can be invoked.
  • Continue starts a new line from the endpoint of the last series of lines.
  • If a LINE command has been previously executed, continue as follows:
  • Command:LINE
  • Program Response: Specify first point:
  • Press [Enter] or [Spacebar] to initiate line at previous endpoint, then continue defining line(s).
object selection
Object Selection
  • Many commands require a drawn object (i.e. line) to be selected in order to modify it or create a new object.
  • Object selection can be performed in various ways;
    • Left mouse pick on a single object .
    • Type all at the Select object: prompt.
    • Select multiple objects by WindowOption or Crossing Option.
      • Left to right selects only items fully enclosed in box.
      • Right to left selects all items partially enclosed in box.

1

1

Blue:

Window

Green: Crossing Box

2

2

Window Option – Left to Right

Crossing Option – Right to Left

slide65
Load file DEMO2.DWG.

For MOVE command show selection by;

Cursor Pick & unselect by [Shift] key

ALL

Window Option

Crossing Option

Demo
erasing objects
Erasing Objects
  • Command:ERASE
  • Select objects to erase using selection methods discussed.
  • When done selecting, complete command by either;
    • Pressing [Enter] or [Spacebar].
    • Right clicking mouse.
  • Alternate Method:
    • Pre-Select objects by any method.
    • Press [Delete] key.
erasing objects1
Erasing Objects

Menu Methods for Erasing Objects:

ERASEcommand using Modify Toolbar

ERASEcommand using Modify drop down menu

slide68
Load file DEMO2.DWG.

Show object selection methods.

Show Erase commands.

Demo
exercise7
Exercise:

1

  • If not already started, start a drawing by using Start From Scratch with Imperial units.
  • Use the typed LINE command and mouse picks to draw approximatelythe shapes shown.
  • Use the Undo option and ERASE command to correct mistakes.
  • Use the Close option and Continue options when appropriate.
  • Experiment with various termination methods;
    • [Enter], [Esc], [Spacebar], and Right mouse click.
  • After I’ve seen your results, practice erasing with various selection options.

2

3

4

5

basic display commands
Basic Display Commands

Zooming and Panning:

  • These are basic display functions used to manipulate your view of the object (graphic image).
  • Zooming – visually reduces or enlarges the display image and (actual size & dimensions not altered).
    • To zoom in (enlarge image) – rotate the scroll wheel on your mouse away from you.
    • To zoom out (reduce image) – rotate the scroll wheel on your mouse towards you.
  • Panning – visually translates the display image on the screen (actual location in World CS is not altered).
    • Depress the scroll wheel button and translate mouse in desired direction for display image movement.
  • Many other methods & options. These are just 2 to get started.
slide71
Load file DEMO2.DWG.

Show Mouse Zoom

Show Mouse Pan.

Show double-click of middle mouse button for extents.

Demo
exercise8
Exercise:
  • For Figure 1:
    • Draw the red segments (top to bottom) using the drop down menu Line command, then issue [Esc] to end the command.
    • Use toolbar Line command with the Continue option to draw the green segments.
  • Erase all line segments.
  • For Figure 2:
    • Draw your own rendition of a house using the Line command and options. Use Erase as necessary.

1

2

undoing a command
Undoing a Command
  • In the previous exercises, you probably made some mistakes which required you to erase and redraw.
  • The undo command sequentially reverses the effects of each command previously executed.
  • To undo the last executed command:
    • Command:U
    • Or select Undo from the Standard Toolbar.
  • If the undo was unintentional, the REDO command reverses the effects of the last undo only.
    • Command:REDO
    • Redo from the Standard Toolbar allows multiple redo.

Redo

Undo

undoing a command1
Undoing a Command

Subtleties of Undoing a command:

  • The UNDO command can be issued repeatedly to backtrack and undo several commands in sequence.
  • The typed REDO command only works once and must be issued immediately after the U command. REDO from the toolbar allows multiple undos in succession.
  • All graphics display commands are included in the Undo list.
  • Don’t get confused!
    • The U command should not be confused with the [Undo] option for line creation.
  • Even more confusing!
    • There is another undo command

Command:UNDO rather than Command:U

    • Command:UNDO is a more sophisticated form of undo which we will look at later.
slide75
Show undo via command U.

Show redo via command REDO.

Show undo/redo via toolbar button.

Show undo/redo via toolbar button drop down.

Demo
specifying coordinates for points
Specifying Coordinates for Points
  • Thus far…end points for lines have been specified by approximate mouse picks in the drawing plane.
  • What are the problems with using this method?
  • 4 Accurate Methods for Defining Coordinates in AutoCAD:
    • Absolute Rectangular Coordinates
    • Relative Rectangular Coordinates
    • Relative Polar Coordinates
    • Direct Distance Entry
specifying coordinates for points1
Specifying Coordinates for Points

Example:

Command: line

Specify first point: -4,-2

Specify next point or [Undo]: 2,-2

Specify next point or [Undo]: 2,1

Specify next point or [Close/Undo]: -4,1

Specify next point or [Close/Undo]: close

Absolute Rectangular

Coordinates:

  • Coordinates given with respect to origin (0,0) of World coordinate system.
  • Same as 2D Cartesian coordinate system discussed earlier.
  • Points specified as X,Y pairs separated by comma.

World

exercise9

Use the grid spacing to draw the object using Absolute Rectangular coordinates. Only refer to the table at left if you get stuck.

Exercise:
  • Pnt Coord.
  • 3,1
  • 3,5
  • 4,5
  • 5,2
  • 6,5
  • 7,5
  • 7,1
  • 1 C
specifying coordinates for points2
Specifying Coordinates for Points

Relative Rectangular Coordinates:

  • Coordinates given with respect to last input point (not the origin of the World CS).
  • Behaves as if origin relocated to last input point.
  • Points specified as X,Y pairs preceded with the @ symbol and separated by a comma.

Ex: @2,4

Example:

Command: line

Specify first point: 1,0 (Absolute Coords.)

Specify next point or [Undo]: @4,0

Specify next point or [Undo]: @2,2

Specify next point or [Close/Undo]: @-4,0

Specify next point or [Close/Undo]: close

@2,2

@-4,0

@4,0

exercise10
Exercise:
  • Pnt Coord.
  • 3,1
  • @4,0
  • @-1,1
  • @1,0
  • @0,1
  • @-1,2
  • @-1,-1
  • @-1,1
  • @-1,-2
  • @0,-1
  • @1,0
  • 1 @-1,-1
  • Use the grid spacing to draw the object using Relative Rectangular coordinates. Only refer to the table at left if you get stuck.
specifying coordinates for points3
Specifying Coordinates for Points

Example:

Command: line

Specify first point:1,0 (Absolute Coords.)

Specify next point or [Undo]:@3<0

Specify next point or [Undo]:@1<90

Specify next point or [Close/Undo]:@4.2<135

Specify next point or [Close/Undo]:close

Relative Polar Coordinates:

  • Coordinates given with respect to last input point (not origin of World CS).
  • Locate by entering distance from last point to new point and angle of line between points from Positive X-axis.
  • Point specified by distance r and angle preceded with the @ symbol.

Ex: @2<30

= positive for  rotation.

= negative for rotation.

@4.2<135

@1<90

@3<0

another example of polar coordinates
Another Example of Polar Coordinates

Example A:

Command: line

Specify first point: 1,0

Specify next point or [Undo]: @2<315

Specify next point or [Undo]: @2<210

Specify next point or [Close/Undo]:

Example B:

Command: line

Specify first point: 1,0

Specify next point or [Undo]: @2<-45

Specify next point or [Undo]: @2<-150

Specify next point or [Close/Undo]:

All line lengths = 2 units

@2<-45

@2<315

@2<210

@2<-150

Example A:

Example B:

exercise11
Exercise:
  • Using only the dimensions on the drawing, draw the martini glass using relative polar coordinates. Only refer to the table at left if you get stuck.
  • Pnt Coord.
  • 1.5,1.75
  • @2.25<0
  • @0.25<90
  • @1.0<180
  • @2.0<90
  • @2.0<30
  • @3.7141<180
  • @2.0<-30
  • @2.0<-90
  • @1.0<180
  • 1 @0.25<-90

Hint: this part is symmetric

specifying coordinates for points4
Specifying Coordinates for Points

Direct Distance:

  • Coordinates given with respect to the last input point (not the World CS origin).
  • Similar to Relative Polar Coordinates but angle is determined by cross-hair position with respect to last point. Distance between the points is entered from keyboard.
  • Points specified by distance r and cursor position.
slide86
Show use of Direct Distance for defining points.

Show Ortho Mode (F8).

Show Polar Tracking.

Demo
exercise12
Exercise:
  • Use Direct Distance Entry to draw the given object. You must first set your polar tracking angle to 45º to draw the angled corners.

Hint: this part is symmetric

modifying objects
Modifying Objects

MOVE Command:

  • Used to relocate and assemble objects.
  • Selected object(s) are displaced within the World CS.
  • Pick or enter a 2nd point defining end of displacement path then press [Enter]. Selected objects move parallel to displacement path.

Command: MOVE

Select objects:

Specify base point or [Displacement]:

Specify second point of displacement or <use first point as displacement>:

Select objects by any method discussed then press [Enter] or [Spacebar].

Pick or enter a point defining start of displacement path then press [Enter].

slide89
Load Demo4.dwg

Show use of MOVE command.

Absolute Coordinates

Relative Coordinates

Demo
move command menu method
Move Command – Menu Method

Modify > Move from drop down menu

Move icon from Modify toolbar

exercise13
Exercise:
  • Draw the following object using the LINE command.
  • Use the MOVE command to move entire object so its lower left corner is at absolute coordinate (6,6). Zoom and Pan to center object on screen.
  • Move object 3 units to right and 2 units down.
  • Move lower horizontal line 1 unit down.
  • Move upper horizontal line 1 unit up.

Each block = 1 unit

(2,2) Absolute Coordinates

drawing circles
Drawing Circles
  • Q: There are 6 methods for creating circles. Why so many options?.
  • Circle Creation Options:
    • Center and Radius
    • Center and Diameter
    • 3 Point
    • 2 Point
    • Tangent Tangent Radius
    • Tangent Tangent Tangent
drawing circles1
Drawing Circles

CIRCLE – Center & Radius (default):

Command:CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

  • Pick or enter center point for circle.

Specify radius of circle or [Diameter] <0.750>:

  • Press [Enter] to accept default radius
  • Or Enter new radius (i.e. 3).
  • Or Enter a point which lies on circumference (absolute or relative to center point).
  • Or Pick a point which lies on circumference (Drag circle).

Command:

P1

P2

slide95
Load Demo4.dwg

Circle – Center and Radius

Default radius.

Enter radius.

Pick a point which lies on circumference.

Enter absolute point which lies on circumference.

Enter relative point which lies on circumference.

Demo
drawing circles2
Drawing Circles

P1

CIRCLE – Center & Diameter:

Command:CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

  • Pick or enter center point for circle.

Specify radius of circle or [Diameter] <0.7158>:

  • EnterD [Enter] for diameter option.

Specify diameter of circle <2.500>:

  • Press [Enter] to accept default diameter.
  • Enter new diameter (i.e. 6).
  • Enter a point (absolute or relative) - defines diameter by distance between point and center point.
  • Pick a point - defines diameter by distance between point and center point. (Drag circle).

Command:

P2

slide97
Load Demo4.dwg

Circle – Center and Diameter

Enter diameter.

Enter absolute point which defines diameter.

Enter relative point which defines diameter.

Pick a point which defines diameter.

Demo
exercise14
Exercise:

Each block = 1 unit

  • Use the CIRCLE command with the default center&radius option to create the pink circle in figure A.
  • Use the CIRCLE command with the center &diameter option to create the blue circle in figure A.
  • Use the MOVE command to center the pink circle in the blue circle as shown in figure B.

A

(0,0) Absolute Coordinates

B

drawing circles3

P2

P1

P3

Drawing Circles

CIRCLE – 3 Point Circle

Any 3 non-linear points can define a circle.

Command:CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

  • Enter3P [Enter] for 3 point option .

Specify first point on circle:

  • Pick or enter first point on circle

Specify second point on circle:

  • Pick or enter 2nd point on circle

Specify third point on circle:

  • Pick or enter 3rd point on circle

Command:

drawing circles4
Drawing Circles

CIRCLE – 2 Point Circle

Any 2 points can define a circle diameter.

Command:CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

  • Enter2P [Enter] for 2 point option .

Specify first end point of circle's diameter:

  • Pick or enter first point.

Specify second end point of circle's diameter:

  • Pick or enter 2nd point.

Command:

P1

P2

exercise15
Exercise:
  • Create the following circles as specified.

4

5

3

2

1

tangency
Tangency
  • Our next circle creation method requires understanding the meaning of Tangent.
  • Two objects (curves) are tangent if they touch at a single point without intersecting and have the same slope (direction) at that point.

Circle Tangent to Circle

Circle Tangent to Line

drawing circles5
Drawing Circles

P1

P2

CIRCLE – Tangent Tangent Radius

Creates a circle tangent to two objects

(line, arc, or circle) and with specified radius.

Command:CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:

  • EnterT [Enter] for tan tan radius option .

Specify point on object for first tangent of circle:

  • Pick point on first object to which circle will be tangent.

Specify point on object for second tangent of circle:

  • Pick point on second object to which circle will be tangent.

Specify radius of circle:

  • Enter value.
  • Define radius by distance between 2 picked points.
  • Define radius by distance between 2 entered points.

Command:

R

drawing circles6
Drawing Circles

CIRCLE – Tangent Tangent Radius

  • Pick locations determine configuration of tangencies.
  • Some combinations may have no solution!

P1

P2

P1

P2

Radius = 2

slide105
Load file Demo3.dwg.

Circle – Tangent Tangent Radius

Demo
drawing circles menu methods
Drawing Circles – Menu Methods

Circle command on Draw Drop down menu has one additional option (tan tan tan). Tan tan tan option requires picking 3 objects for tangency, but no radius is input.

Circle Icon on Draw toolbar operates the same way as CIRCLE command

exercise16
Exercise:

Create the following:

  • Line 1 - end points (4,1) (10,2).
  • Circle 2 - center (2,4) and radius=2.
  • Circle 3 - through points (8,4) (10,6) (5.5,5.5).
  • Circle 4 – Tangent to Line 1, Circle 2, and Circle 3.
  • Circle 5 – Tangent to Line 1 and Circle 3, radius=1.5.
  • Circle 6 – Tangent to Line 1 and Circle 2, radius=2.75

3

5

4

2

1

6

review
REVIEW

Quick Review of Commands We Have Learned:

  • Command:LINE- Create a line
  • Command:ERASE- Erase or delete an object
  • Command:U - Undo last command
  • Command:REDO - Reverse effects of last undo.
  • Command:MOVE- Moves object(s) a prescribed distance and direction.
  • Command:CIRCLE - Creates a circle with various options.
display commands
Display Commands

ZOOM – Reduces or enlarges display image. Similar to zoom function using scroll wheel on mouse, but with additional options.

Object

Zooms & centers selected object to full screen

Window

(default) Use Bounding box to select area you want to zoom in on.

ZOOM

Scale

All

Previous

Display from previous zoom is regenerated.

Extents

All drawing objects are fitted to fill graphics window.

Center

Dynamic

display commands1
Display Commands

ZOOM Command

Command:ZOOM

Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>:

  • Window – specify bounding box.
  • Extents – Type E[Enter].
    • Alternate method: Don’t issue command; instead quickly double-click the scroll-wheel button on your mouse
  • Previous – Type P[Enter].
  • Object – Type O[Enter]. Then select object to zoom to.
slide111
Load file Demo2.dwg

Show Zoom Command:

Window

Extents

Previous

Object

Demo
display commands2
Display Commands

Pan Realtime

Zoom Realtime

Zoom Previous

Zoom Window

Zoom and Pan functions can also be accessed from the Standard Toolbar menu

exercise17
Exercise:
  • Create circles and lines approximately as shown.
  • Use the typed Zoom command with options as directed:
    • Display all geometry - Extents option.
    • Display only red circle – Object option.
    • Display all geometry – Previous option.
    • Display blue line & green circle – Window option.
    • Display all geometry - Extents option.
  • When finished, experiment with toolbar zoom & pan options.
automatic timed saves
Automatic Timed Saves

Automatic Timed Saves:

  • As a precaution against lost data, AutoCAD automatically saves your file to a temporary folder at periodic intervals while you work ( every 120 min without you knowing).
  • In other words, if you lose a file or data it may still be retrievable. You will need to see me to find out how.
  • A WORD OF CAUTION: do not use this feature as an excuse for sloppy file management … the files may still be unrecoverable!

…Save early, Save Often!

automatic backups
Automatic Backups

Automatic Backup Files:

  • When you perform a save to an existing file, AutoCAD first creates a backup of the existing file (using a different extension) and then overwrites the existing file with the current session data.
  • Example: If hub_1.dwg exists and I save to that file;

Existing hub_1.dwg data  hub_1.bak

Current session data  hub_1.dwg

  • The file icons for the .bak and .dwg files will appear different in Windows Explorer.
  • Backup file is good in case you accidentally overwrite a file.
  • You can use the backup file by changing its extension from .bak to .dwg.
slide117
Show automatic backup files (.bak).

Change backup file to .dwg file and open.

Demo
opening multiple files
Opening Multiple Files
  • In AutoCAD, multiple files may be open simultaneously.
  • Allows you to switch between multiple open sessions or display them together in a pattern for comparison via “tile”.
  • Accessed thru the Window drop down.
slide120
Show opening multiple files

Show switching between files

Show tiling files

Demo
basic plotting
Basic Plotting

Basic Plotting Requires Several Steps :

  • Select Plotter – We have two plotters available, so the correct plotter must be selected. Typically, use the Laser Printer for CAD I.
  • Select Paper Size – Choose a paper size which is supported by your selected plotter (remember standard sizes from Drafting I?).
  • Specify Plot Area – The entire drawing or just a portion may be plotted. Determine what portion of the drawing to plot.
  • Set Plot Scale – Most drawings conform to a particular scale (i.e. 1:2, 1:4). For our first exercises this is not required, but for later assignments an appropriate scale MUST be used!
basic plotting1
Basic Plotting

Basic Plotting Requires Several Steps :

  • Set the Plot Style Table – Select the More button , then select monochrome.ctb. This ensures all colored lines are black instead of gray scale.
  • Specify Paper Orientation – Portrait or Landscape . We typically use  Landscape orientation.
  • Preview Plot – Often times, the plot will not appear as expected. You shouldALWAYS preview the plot on your display screen before plotting. This saves wasted paper and toner (save a tree)!
  • Plot – Send the plot to the plotter and retrieve your hardcopy!
basic plotting2
Basic Plotting

A Plot can be initiated in 3 ways and they all do the same thing

 bring up Plot Dialog Box

  • Command:Plot
  • File drop down menu > Plot…
  • Standard toolbar > Plot

Plot – Standard toolbar.

Plot - File Drop down menu.

basic plotting3
Basic Plotting

Plot Dialog Box

 Select Plotter

 Select Plot Scale

Select Paper Size

Specify Plot Area

 Select More button to expand

basic plotting4
Basic Plotting

 Set Plot Style Table

Plot Dialog Box

 Select Paper Orientation

 Preview Plot

slide126
Basic Plotting –

Show plot set up and basic options.

Demo
exercise18

Your Instructor

Exercise:
  • Start a new drawing.
  • Draw a QUICK and SIMPLE self portrait (don’t be concerned if it doesn’t look like you…its just so you recognize the drawing when you pick it up at the plotter!).
  • Plot your drawing using the following ;
    • Plotter Device = Ask me
    • Paper Size = 8.5 x 11
    • Plot Area = Window
    • Center the Plot = 
    • Scale = Scaled to Fit
    • Plot Style Table = Monochrome.ctb
    • Paper Orientation = Landscape
  • First do a Print Preview, then print your self portrait, retrieve it from the printer, and gaze in amazement!
slide128
HELP!
  • In some instances (OK many instances) you may be lacking knowledge of a particular AutoCAD topic. Even your instructor may not know the answer (hard to believe, but true)!
  • Command:Help
  • Help drop down menu > Help
  • Standard toolbar > 

Standard Toolbar Help

Help Drop Down Menu

slide129
HELP!

Auto-CAD Help Dialog Box:

slide130
AutoCAD Help System

Show Contents

Show Index

Show Search methods

Demo
exercise19
Exercise:
  • Using AutoCAD Help, determine how to create a Donut, then create the drawing below (don’t include dimensions).

Origin

review1
REVIEW

Quick Review of Commands We Have Learned:

  • Command:Line - Create a line
  • Command:Erase - Erase or delete an object
  • Command:U- Undo last command
  • Command:Redo - Reverse effects of last undo.
  • Command:Move - Moves object(s) a prescribed distance and direction.
  • Command:Circle - Creates a circle with various options.
  • Command:Zoom - Enlarges or reduces display image.
  • Command:Pan - Translates display image.
  • Command:Qsave -Saves session data to current file name.
  • Command:Plot - Brings up Plot Dialog Box, allowing plot configuration, plot preview, and actual plot.
  • Command:Help - Starts AutoCAD Help dialogue box.
chapters 1 2 the end
Chapters 1 & 2 - The End

Congratulation, you now know enough to be extremely dangerous!

opening and closing files1
Opening and Closing Files
  • You can open and close files at any time without leaving AutoCAD.
  • Multiple sessions/files may be open simultaneously.
  • Typically, such operations are performed with the File drop down menu.
  • Starts a new file. Initiates Start-Up dialog box (same as when you started AutoCAD).
  • Opens an existing file. Initiates Select-File dialog box. Allows you to browse for desired file.
  • Closes the active session. If the session has not been saved, a prompt to save will be initiated.
saving your work7
Saving Your Work!

Save – Other Methods:

  • Command:Save
  • Command:Saveas
    • Both of these commands act identical to the Save As… command from the drop down menu. The Save AS dialog box will appear in both cases.
  • Command:Qsave
    • Acts identical to the Save command from the drop down menu. No prompt or dialogue box will appear unless it’s the first time saved. The current drawing name file is written over with current session data.
  • Toolbar Quick Save:
    • Acts identical to the command line Qsave.
exercise20
Exercise:
  • If not already started, start a drawing by using Start From Scratch with English units.
  • Browse through the various Drop down and toolbar menus and just examine what’s in there.
  • Then locate the following commands as directed, but DO NOT issue the command.

Tip: use tool-tips to display the toolbar command names.

    • Polyline command - drop down menus.
    • Circle command - toolbar menus.
    • Array command - toolbar menus.
    • Rotate command - drop down menus.
    • 3-Point Arc command - drop down menus.
    • Help command – toolbar menus.
dialog boxes
Dialog Boxes
  • Some commands use a dialog box for command data input.
  • Set the required Toggle Buttons, Slider Bars, Edit Boxes, etc. then left click OK.

Edit Boxes

Toggle Buttons

Slide Bars

Activate Command with left mouse click

coordinate space4
Coordinate Space

2D Rectangular Coordinate System (Cartesian):

  • Plane defined byX (horizontal) andY (vertical) axes.
  • Origin(0,0)is intersection ofXand Yaxes.
  • Xcoordinate measureshorizontaldistance from origin.

+Y

  • Ycoordinate measuresverticaldistance from origin.
  • Coordinates of a point are indicated by X, Y pairs.Ex: -3,5
  • Axes divide coordinate plane into 4 quadrants I, II, III,and IV.

X

Y

II

I

+X

-X

III

IV

-Y

exercise21
Exercise:
  • What are the X & Y coordinates of point
    • A
    • B
    • C
    • D
    • E
  • Give the quadrant for the following points;
    • (-5, -4)
    • (6, 1.8)
    • (2.4, -1)
    • (-5, 4)
  • Locate point at;
    • (-3,-5)….

Y

B

E

A

X

D

C

coordinate space5
Coordinate Space

2D Polar Coordinate System:

  • Alternate method of defining points in an X-Y plane.

Location defined by radial distance from origin and an angle.

  • Radius (R)is the direct radial distance from origin to point.
  • Theta (Ө)is the angle between the +X axis and the radial line to the point;
    • Counter-clockwise about +Z axis is positive angle.
    • Clockwise about +Z axis is negative angle.
  • Convenient for defining inclined lines & used often in AutoCAD.

4.530º

Origin

R

Ө

coordinate space6
Coordinate Space

3D Cartesian Coordinate System:

  • 3D space defined by 3 mutually perpendicular axes X,Y, Z.
  • Origin is intersection of X, Y, and Z axes (0,0,0).
  • X and Y coordinates similar to 2D Cartesian system; Z coordinate adds depth.

X

Y

Z

Positive Y

  • Coordinates of a point are indicated by X, Y, Z values. Ex: (0,4,0)
  • This system used in AutoCAD. For 2D drafting, Z=0 simulates 2D system.
  • Common system used for 3D wireframe & 3D Solid Modeling.

Negative Z

Negative X

PositiveZ

Positive X

Negative Y

coordinate space7

+Y

Coordinate Space

-Z

Right Hand Rule:

  • Specifies direction and sign (positive or negative) of the axes (X,Y,Z) for a Cartesian coordinate system.
  • Fingers point in positive direction.

-X

+X

+Z

-Y

+Y

+Y

+Z

+X

+X

+X

coordinate space8
Coordinate Space

3D Cylindrical and Spherical Coordinate Systems:

  • Similar to 2D polar system;
    • For Cylindrical system, depth added by additional linear coordinate along Z-axis.
    • For Spherical system, depth added by additional angular coordinate from X-axis in the X-Z plane.

3D Cylindrical System

3D Spherical System

R

Ө

exercise22

Use the grid spacing to draw the object using absolute rectangular coordinates. Only refer to the table at left if you get stuck.

Exercise:
  • Pnt Coord.
  • 3,1
  • 3,6
  • 4,6
  • 4,2
  • 5,2
  • 6,3
  • 7,3
  • 7,1
  • 3,1
exercise23
Exercise:
  • Pnt Coord.
  • 3,1
  • @4,0
  • @0,1
  • @-1,0
  • @1,1
  • @0,2
  • @-1,0
  • @-1,-1
  • @-1,1
  • @-1,0
  • @0,-2
  • @1,-1
  • @-1,0
  • @0,-1
  • Use the grid spacing to draw the object using relative rectangular coordinates. Only refer to the table at left if you get stuck.
exercise24
Exercise:
  • Using only the dimensions on the drawing, create the object using relative polar coordinates. Only refer to the table at left if you get stuck.
  • Pnt Coord.
  • 1.5,1.75
  • @1.0<90
  • @2.0<0
  • @2.0<30
  • @0.75<0
  • @1.25<-90
  • @1.0<180
  • @0.5<270
  • @1.0<0
  • @1.25<270
  • @0.75<180
  • @2.0<150
  • @2.0<180

Hint: this part is symmetric

exercise25
Exercise:
  • Use Direct Distance Entry to draw the given object. You must set your polar tracking angle to 45º to draw the chamfered corners.
exercise p 1
Exercise: (p.1)
  • Using Windows Explorer, create a folder named CAD I – Class Exercises unless you already have a similar folder.
  • Start up AutoCAD if not already up.
  • Close any open files using Close in the File drop down menu.
  • Start a new file using the File drop down menu (Use start from scratch with English units).
  • Draw a circle.
  • Save your file as Circle 1.dwg in CAD I – Class Exercises using the File drop down menu.
  • Use Explorer to examine the contents of CAD I – Class Exercises. Notice Circle 1.dwg .
  • Save your file again as Circle 1.dwg in CAD I – Class Exercises using the Qsave toolbar.
  • Use Explorer to examine the contents of CAD I – Class Exercises. Notice Circle 1.bak and Circle 1.dwg .
exercise p 2
Exercise: (p.2)
  • Start a new file using the File drop down menu (Use start from scratch with English units).
  • Draw 1 line.
  • Save your file as Line 1.dwg in CAD I – Class Exercises using the File drop down menu.
  • Examine the file name at the top of the AutoCAD screen.
  • Use Explorer to examine the contents of CAD I – Class Exercises.
  • Draw a second line.
  • Save your file as Line 2.dwg in CAD I – Class Exercises using Save As… in the File drop down menu.
  • Examine the file name at the top of the AutoCAD screen.
  • Use Explorer to examine the contents of CAD I – Class Exercises.
exercise p 3
Exercise: (p.3)
  • Click on the Window drop down menu.
  • Notice the folder path and file names of the 2 files at the bottom of the Window drop down menu. These are the session files you currently have open. The check mark indicates the active session (Line 2.dwg).
  • Click on Circle 1.dwg at the bottom of the Window drop down menu. It should become active.
  • Alternately activate each session until you are comfortable with the process.
  • Activate Circle 1.dwg , then close it using the File drop down menu.
  • Open Line 1.dwg , using the File drop down menu.
  • Close Line 2.dwg , using the File drop down menu. Line 1.dwg should be the only active session. Check this by viewing the Window drop down menu.
exercise26
Exercise:
  • Using AutoCAD Help, determine how to draw an arc using a Start point, Center point, and End point. Then draw an arc using the folowing data:
    • Start Point = (5, 0)
    • Center Point = (2, 2)
    • End Point = (2, 5.6056)
exercise solution
Exercise: Solution
  • Using AutoCAD Help, determine how to draw an arc using a Start point, Center point, and End point. Then draw an arc using the folowing data:
    • Start Point = (5, 0)
    • Center Point = (2, 2)
    • End Point = (2, 5.6056)

End (2,5.6056)

Center (2,2)

(0,0)

Start (5,0)

exercise27
Exercise:
  • Using AutoCAD Help, determine how to create a filled Donut, then create the drawing below (don’t include dimensions).

Origin