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 • Chap 6 – Editing with Grips • Chap 7 – Controlling Drawing Display & Creating Text • Chap 13 – Hatching • Chap 14 – Blocks
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? 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! • 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 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? • 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 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/).
Demo • Show demo of suggested file folder structure.
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
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 • 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: • 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 • Options; • Startup Dialog Box • No Startup Dialog Box • Options Selected by; • Tools > Options > System > General Options > Startup Startup Dialog Box
Show Startup dialog box. Demonstrate changing Startup dialog box. Tools > Options > System > General Options > Startup Set to show Startup Dialog Box. Demo
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 • Options: • Open a Drawing • Start from Scratch • Imperial • Metric • Use a Template • Use a Wizard • Advanced Setup • Quick Setup
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 • 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 • 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 • 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)
Show Startup dialog box options. Open a Drawing Start from Scratch Use a Template Use a Wizard Demo
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! • 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 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 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 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 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.
*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 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.
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 • 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.
Opening and Closing Files: Open an existing file. Open a new file. Close a file. Demo
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 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 • 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.
Show AutoCAD layout. Show various methods to issue one command. Show response in Command Window. Demo
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
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
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
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
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 • 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).
Show –TOOLBAR command. Turn on (Show) all toolbars. Turn off (Hide) all toolbars. Turn on the STANDARD toolbar. Demo
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.
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 • 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