AutoCAD 2007 TutorialFirst Level: 2D FundamentalsText byRandy H. ShihOregon Institute of TechnologyMultiMedia CD byINSIDE:Jack ZecherIndiana University Purdue University IndianapolisMultiMedia CDby Jack ZecherSDCPUBLICATIONSAn audio/visualpresentation of thetutorial exercisesSchroff Development

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AutoCAD 2007 TutorialCopyrightedMaterialChapter 1 AutoCAD FundamentalsCopyrightedMaterialCopyrightedMaterial Create and Save AutoCAD DrawingFiles Use the AutoCAD Visual ReferenceCommands Draw, Using the LINE and CIRCLECommands Use the ERASE Command Define Positions Using the Basic EntryMethods Use the AutoCAD Pan Realtime OptionCopyrightedMaterial1-1

1-2AutoCAD 2007 TutorialCopyrightedMaterialIntroductionLearning to use a CAD system is similar to learning a new language. It is necessary tobegin with the basic alphabet and learn how to use it correctly and effectively throughpractice. This will require learning some new concepts and skills as well as learning adifferent vocabulary. All CAD systems create designs using basic geometric entities.Many of the constructions used in technical designs are based upon two-dimensionalplanar geometry. The method and number of operations that are required to accomplishthe constructions are different from one system to another.In order to become effective in using a CAD system, we must learn to create geometricentities quickly and accurately. In learning to use a CAD system, lines and circles arethe first two, and perhaps the most important two, geometric entities that one shouldmaster the skills of creating and modifying. Straight lines and circles are used in almostall technical designs. In examining the different types of planar geometric entities, theimportance of lines and circles becomes obvious. Triangles and polygons are planarfigures bounded by straight lines. Ellipses and splines can be constructed by connectingarcs with different radii. As one gains some experience in creating lines and circles,similar procedures can be applied to create other geometric entities. In this chapter,the different ways of creating lines and circles in AutoCAD 2007 are examined.CopyrightedMaterialStarting Up AutoCAD 20071. Select the AutoCAD 2007 option on the Program menu or select theAutoCAD 2007 icon on the Desktop. Once the program is loaded intomemory, the AutoCAD 2007 drawing screen will appear on the screen.CopyrightedMaterialCopyrightedMaterial

AutoCAD Fundamentals1-3CopyrightedMaterial2. Choose AutoCAD Classic as the initialworkspace.3. Select Don’t Show me this again and click OKto continue. Note that AutoCAD automatically assigns generic name, Drawing X, as newdrawings are created. In our example, AutoCAD opened the graphics windowusing the default system units and assigned the drawing name Drawing1.CopyrightedMaterialCopyrightedMaterial4. Close the Tool Palettes by clicking once onClose button located at the upper right cornerof the window as shown.CopyrightedMaterial5. Close the Sheet Set Manager by clicking onceon the Close button located at the upper rightcorner of the window as shown.

1-4AutoCAD 2007 TutorialCopyrightedMaterialDrawing Units SetupEvery object we construct in a CAD system is measured in units. We should determinethe value of the units within the CAD system before creating the first geometric entities.1. In the pull-down menus, select:[Format] [Units]CopyrightedMaterial2. In the Drawing Units dialog box, set the Length Type to Decimal. This will setthe measurement to the default English units, inches.CopyrightedMaterialCopyrightedMaterial3. Set the Precision to two digits after the decimal point as shown in the abovefigure.4. Pick OK to exit the Drawing Units dialog box.

AutoCAD Fundamentals1-5CopyrightedMaterialDrawing Area SetupNext, we will set up the Drawing Limits; setting the Drawing Limits controls theextents of the display of the grid. It also serves as a visual reference that marks theworking area. It can also be used to prevent construction outside the grid limits and as aplot option that defines an area to be plotted/printed. Note that this setting does not limitthe region for geometry construction.1. In the pull-down menus, select:[Format] [Drawing Limits]CopyrightedMaterial2. In the command prompt area, near the bottom of the AutoCAD drawingscreen, the message “Reset Model Space Limits: Specify lower left corner or[On/Off] 0.00,0.00 :” is displayed. Press the ENTER key once to accept thedefault coordinates 0.00,0.00 .CopyrightedMaterial3. In the command prompt area, the message “Specify upper right corner 0.00,0.00 :” is displayed. Press the ENTER key once to accept the defaultcoordinates 12.00,9.00 .CopyrightedMaterial4. On your own, move the graphic cursor near the upper-right comer insidethe drawing area and note that the drawing area is unchanged. (The DrawingLimits command is used to set the drawing area; but the display will not beadjusted until a display command is used.)

1-6AutoCAD 2007 TutorialCopyrightedMaterial5. In the pull-down menus, select:[View] [Zoom] [All] The Zoom All command will adjustthe display so that all objects in thedrawing are displayed to be as large aspossible. If no objects are constructed,the Drawing Limits are used to adjustthe current viewport.6. Move the graphic cursor near the upperright comer inside the drawing area andnote that the display area is updated.CopyrightedMaterialUsing the Line Command1. Click on the Info Palette option in the Helppull-down menu to activate the Quick Helpoption.CopyrightedMaterial2. Move the graphics cursor to the first icon in the Draw toolbar.This icon is the Line icon. A help-tip box appears next to thecursor and a brief description of the icon is displayed at thebottom of the AutoCAD drawing screen: “Creates Straightline segments: LINE.”3. Select the icon by clicking once with the left-mouse-button,which will activate the Line command. Notice a brief explanation of the selectedcommand is displayed in the Info Palettewindow. It is highly recommended that you readthe explanations to gain some insights on thegeneral procedure of using AutoCAD .CopyrightedMaterial4. In the Info Palette window, click To drawlines to open the AutoCAD Help window andget a more detailed explanation on the procedure.

AutoCAD Fundamentals1-7CopyrightedMaterial The general procedure to create a linein AutoCAD is displayed in the InfoPalette window.5. Click on Close button located at theupper left corner of the Info Palettewindow as shown.CopyrightedMaterial6. In the command prompt area, near the bottom of the AutoCAD drawing screen,the message “ line Specify first point:” is displayed. AutoCAD expects us toidentify the starting location of a straight line. Move the graphics cursor insidethe graphics window and watch the display of the coordinates of the graphicscursor at the bottom of the AutoCAD drawing screen. The three numbersrepresent the location of the cursor in the X, Y, and Z directions. We can treatthe graphics window as if it was a piece of paper and we are using the graphicscursor as if it were a pencil with which to draw.CopyrightedMaterialCoordinates of the locationof the graphics cursor.53CopyrightedMaterial21 We will create a freehand sketch of a fivepoint star using the Line command. Do notbe overly concerned with the actual size orthe accuracy of your freehand sketch. Thisexercise is to give you a feel for theAutoCAD 2007 user interface.4

1-8AutoCAD 2007 TutorialCopyrightedMaterial7. We will start at a location nearthe bottom of the graphics window.Left-click once to position thestarting point of our first line.This will be point 1 of our sketch. The two numbers, displayed next tothe cursor, represent the currentcursor position. Note that the sametwo numbers are also displayed at thelower left corner of the AutoCADmain window. The displaying oftooltips is known as the DynamicInput option. Tooltips are displayednear the cursor, which aredynamically updated as the cursormoves.CopyrightedMaterial8. Next move the cursor upwardand toward the right side ofpoint 1. Notice the rubber-bandline that follows the graphicscursor in the graphics window.Left-click again (point 2) and wehave created thefirst line of our sketch.CopyrightedMaterial The two numbers, displayed nextto the cursor, represent thedistance and angle of the currentcursor position relative to thepreviously selected location onthe screen. This feature is alsopart of the Dynamic Inputoption. A more detaileddiscussion on how to utilize thisfeature is presented in Chapter 3of this text.CopyrightedMaterial

AutoCAD Fundamentals1-9CopyrightedMaterial9. Move the cursor to the left ofpoint 2 and create a horizontal lineroughly about the same length asthe first line on the screen.CopyrightedMaterial532110. Repeat the above steps and completethe freehand sketch by adding three morelines (from point 3 to point 4, point 4 topoint 5, and then connect to point 5 backto point 1).CopyrightedMaterial411. Notice that the Line command remains activated even afterwe connected the last segment of the line to the startingpoint (point 1) of our sketch. Inside the graphics window,click once with the right-mouse-button and a popup menuappears on the screen.12. Select Enter with the left-mouse-button to end the Linecommand. (This is equivalent to hitting the [ENTER] keyon the keyboard.)CopyrightedMaterial13. On your own, move the cursor near point 2 and point 3, and estimate the length ofthe horizontal line by watching the displayed coordinates for each point at thebottom of the screen.

1-10AutoCAD 2007 TutorialCopyrightedMaterialVisual ReferenceThe method we just used to create the freehand sketch is known as the interactivemethod, where we use the cursor to specify locations on the screen. This method isperhaps the fastest way to specify locations on the screen. However, it is rather difficultto try to create a line of a specific length by watching the displayed coordinates. It wouldbe helpful to know what one inch or one meter looks like on the screen while we arecreating entities. AutoCAD 2007 provides us with many tools to aid the constructionof our designs. We will use the GRID and SNAP options to get a visual reference as tothe size of objects and learn to restrict the movement of the cursor to a set increment onthe screen.The Status Bar area is located at the bottom of the AutoCAD drawing screen. The wordsSNAP, GRID, ORTHO, POLAR, OSNAP, OTRACK, DUCS, LWT and MODEL appearingto the right of the coordinates are buttons that we can left-click to turn these specialoptions ON and OFF. When the corresponding button is highlighted, the specific optionis turned ON. These buttons act as toggle switches; each click of the button will togglethe option ON or OFF. Using the buttons is a quick and easy way to make changes tothese drawing aid options. We can toggle the options on and off in the middle of anothercommand.CopyrightedMaterialOption ButtonsGRID OnCopyrightedMaterial1. Left-click the GRID button in the Status Bar to turn On the GRID option. (Noticein the command prompt area, the message “ Grid on ” is also displayed.)CopyrightedMaterial2. Move the cursor inside the graphics window, and estimate the distance in betweenthe grid points by watching the coordinates display at the bottom of the screen.

AutoCAD Fundamentals1-11CopyrightedMaterial The GRID option creates a pattern of dotsthat extends over an area on the screen.Using the grid is similar to placing a sheetof grid paper under a drawing. The gridhelps you align objects and visualize thedistance between them. The grid is notdisplayed in the plotted drawing. Thedefault grid spacing, which means thedistance in between two dots on the screen,is 0.5 inches. We can see that the sketchedhorizontal line in the sketch is about 4.0inches long.CopyrightedMaterialDYN Off1. Left-click the DYN button in the Status Bar to turn Off the DynamicInput option.CopyrightedMaterial The DYN button allows the quick toggle of the Dynamic Input option.We will switch off this option to discuss the basic input options available inAutoCAD . A more detailed discussion on this feature is presented in Chapterthree.SNAP On1. Left-click the SNAP button in the Status Bar to turn On the SNAP option.CopyrightedMaterial

1-12AutoCAD 2007 TutorialCopyrightedMaterial2. Move the cursor inside the graphics window, and move the cursor diagonallyon the screen. Observe the movement of the cursor and watch thecoordinates display at the bottom of the screen. The SNAP option controls an invisible rectangular grid that restricts cursormovement to specified intervals. When SNAP mode is on, the screen cursor andall input coordinates are snapped to the nearest point on the grid. The default snapinterval is 0.5 inches, and aligned to the grid points on the screen.3. Click on the Line icon in the Draw toolbar. In the commandprompt area, the message “ line Specify first point:” isdisplayed.CopyrightedMaterial4. On your own, create another sketch of the five-point star with the GRID andSNAP options switched ON.CopyrightedMaterialCopyrightedMaterial5. Use the right-mouse-button and select Enter in the popupmenu to end the Line command if you have not done so.

AutoCAD Fundamentals1-13CopyrightedMaterialUsing the ERASER Command One of the advantages of using a CAD system is the ability to remove entities withoutleaving any marks. We will erase two of the lines using the Erase command.1. Pick Erase in the Modify toolbar. (The icon isthe first icon in the Modify toolbar. The icon isa picture of an eraser at the end of a pencil.)The message “Select objects” is displayed inthe command prompt area and AutoCAD awaitsus to select the objects to erase.CopyrightedMaterial2. Left-click the SNAP button on the Status Bar to turn off the SNAP option sothat we can more easily move the cursor on top of objects. We can toggle theStatus Bar options ON or OFF in the middle of another command.CopyrightedMaterial3. Select any two lines on the screen; the selected lines are displayed as dashedlines as shown in the figure below.CopyrightedMaterial4. Right-mouse-click once to accept the selections. The selected two lines areerased.

1-14AutoCAD 2007 TutorialCopyrightedMaterialRepeat the Last Command1. Inside the graphics window, click once with the rightmouse-button to bring up the popup option menu.2. Pick Repeat Erase, with the left-mouse-button, in thepopup menu to repeat the last command. Notice the otheroptions available in the popup menu. AutoCAD 2007 offers many options to accomplish thesame task. Throughout this text, we will emphasize theuse of the AutoCAD Heads-up DesignTM interface,which means we focus on the screen, not on thekeyboard.CopyrightedMaterial3. Move the cursor to a location that is above and toward the left side of theentities on the screen. Left-mouse-click once to start a corner of a rubber-bandwindow.First cornerCopyrightedMaterialSecond corner4. Move the cursor toward the right and below the entities, and then left-mouseclick to enclose all the entities inside the selection window. Notice all entitiesthat are inside the window are selected.CopyrightedMaterial5. Inside the graphics window, right-mouse-click once to proceed with erasingthe selected entities. On your own, create a free-hand sketch of your choice using the Line command.Experiment with using the different commands we have discussed so far. Also tryswitching the GRID and SNAP options ON and OFF in the middle of a command.

AutoCAD Fundamentals1-15CopyrightedMaterialThe CAD Database and the User Coordinate System Designs and drawings created in a CAD system areusually defined and stored using sets of points in what iscalled world space. In most CAD systems, the worldspace is defined using a three-dimensional Cartesiancoordinate system. Three mutually perpendicular axes,usually referred to as the X-, Y-, and Z-axes, define thissystem. The intersection of the three coordinate axesforms a point called the origin. Any point in world spacecan then be defined as the distance from the origin in theX-, Y- and Z- directions. In most CAD systems, thedirections of the arrows shown on the axes identify thepositive sides of the coordinates.CopyrightedMaterialA CAD file, which is the electronic version of the design, contains data that describethe entities created in the CAD system. Information such as the coordinate values inworld space for all endpoints, center points, etc., along with the descriptions of thetypes of entities are all stored in the file. Knowing that AutoCAD stores designs bykeeping coordinate data helps us understand the inputs required to create entities.3D UCS iconCopyrightedMaterialThe icon near the bottom left corner of the default AutoCAD graphics windowshows the positive X-direction and positive Y-direction of the coordinate systemthat is active. In AutoCAD , the coordinate system that is used to create entities iscalled the user coordinate system (UCS). By default, the user coordinate systemis aligned to the world coordinate system (WCS). The world coordinate system isa coordinate system used by AutoCAD as the basis for defining all objects and othercoordinate systems defined by the users. We can think of the origin of the worldcoordinate system as a fixed point being used as a reference for all measurements.The default orientation of the Z-axis can be considered as positive values in front ofthe monitor and negative values inside the monitor.CopyrightedMaterial

1-16AutoCAD 2007 TutorialCopyrightedMaterialChanging to the 2D UCS Icon Display In AutoCAD 2007, the UCS icon is displayed in various ways to help us visualizethe orientation of the drawing plane.CopyrightedMaterial1. In the pull-down menus, select:[View] [Display] [UCS Icon] [Properties]CopyrightedMaterial2. In the UCS icon style section, switchto the 2D option as shown.CopyrightedMaterial3. Click OK to accept the settings. Note the W symbol in the UCS iconindicates the UCS is aligned to the worldcoordinate system.

AutoCAD Fundamentals1-17CopyrightedMaterialCartesian and Polar Coordinate SystemsIn a two-dimensional space, a point can be represented using different coordinatesystems. The point can be located, using a Cartesian coordinate system, as X andY units away from the origin. The same point can also be located using the polarcoordinate system, as r and θ units away from the origin.CopyrightedMaterialFor planar geometry, the polar coordinate system is very useful for certainapplications. In the polar coordinate system, points are defined in terms of a radialdistance, r, from the origin and an angle θ between the direction of r and the positiveX axis. The default system for measuring angles in AutoCAD 2007 defines positiveangular values as counter-clockwise from the positive X-axis.CopyrightedMaterialAbsolute and Relative CoordinatesAutoCAD 2007 also allows us to use absoluteand relative coordinates to quickly construct objects.Absolute coordinate values are measured from thecurrent coordinate system's origin point. Relativecoordinate values are specified in relation to previouscoordinates. Note that the coordinate display area can also beused as a toggle switch; each left-mouse-click willtoggle the coordinate display on or off.CopyrightedMaterialIn AutoCAD 2007, the absolute coordinates and the relative coordinates can be usedin conjunction with the Cartesian and polar coordinate systems. By default, AutoCAD expects us to enter values in absolute Cartesian coordinates, distances measured from thecurrent coordinate system's origin point. We can switch to using the relative coordinatesby using the @ symbol. The @ symbol is used as the relative coordinates specifier,which means that we can specify the position of a point in relation to the previous point.

1-18AutoCAD 2007 TutorialCopyrightedMaterialDefining PositionsIn AutoCAD , there are five methods for specifying the locations of points when wecreate planar geometric entities. Interactive method: Use the cursor to select on the screen. Absolute coordinates (Format: X,Y): Type the X and Y coordinates to locate thepoint on the current coordinate system relative to the origin. Relative rectangular coordinates (Format: @X,Y): Type the X and Ycoordinates relative to the last point.CopyrightedMaterial Relative polar coordinates (Format: @Distance angle): Type a distance andangle relative to the last point. Direct Distance entry technique: Specify a second point by first moving thecursor to indicate direction and then entering a distance.The Guide PlateWe will next create a mechanical design using the different coordinate entry methods.CopyrightedMaterial CopyrightedMaterialUse the Erase command and erase all entities on the screen beforeproceeding to the next section.

AutoCAD Fundamentals1-19CopyrightedMaterial The rule for creating CAD designs and drawings is that they should be createdat full size using real-world units. The CAD database contains all thedefinitions of the geometric entities and the design is considered as a virtual,full-sized object. Only when a printer or plotter transfers the CAD design topaper is the design scaled to fit on a sheet. The tedious task of determining ascale factor so that the design will fit on a sheet of paper is taken care of bythe CAD system. This allows the designers and CAD operators to concentratetheir attention on the more important issues – the design.1. Select the Line command icon in the Draw toolbar. In thecommand prompt area, near the bottom of the AutoCAD graphics window, the message “ line Specify first point:” isdisplayed. AutoCAD expects us to identify the startinglocation of a straight line.CopyrightedMaterial2. In the command prompt area, we will locate the starting pointof our design at the origin of the world coordinate system.Command: line Specify first point: 0,0 [ENTER](Type 0,0 in the command prompt area and press the[ENTER] key once.)3. We will create a horizontal line by entering the absolute coordinates of thesecond point.CopyrightedMaterialSpecify next point or [Undo]: 5.5,0 [ENTER]CopyrightedMaterial(0,0)(5.5,0)

1-20AutoCAD 2007 Tutorial CopyrightedMaterialThe line we created is aligned to the bottom edge of the drawing window. Letus adjust the view of the line by using the Pan Realtime command.4. Click on the Pan Realtime icon in theStandard toolbar area. The icon is the picture ofa hand with four arrows. The Pan command enables us to move the viewto a different position. This function acts as ifyou are using a video camera.5. Move the cursor, which appears as a hand inside the graphics window, nearthe center of the drawing window, then push down the left-mouse-button anddrag the display toward the right and top side until we can see the sketchedline. (Notice the scroll bars can also be used to adjust viewing of the display.)CopyrightedMaterial6. Press the [Esc] key to exit the Pan command. Notice that AutoCAD goesback to the Line command.7. We will create a vertical line by using the relative rectangular coordinatesentry method, relative to the last point we specified:Specify next point or [Close/Undo]: @0,2.5 [ENTER]8. We can mix any of the entry methods in positioning the locations of theendpoints. Move the cursor to the Status Bar area, and turn ON the GRID andSNAP options.CopyrightedMaterialSNAP and GRID On9. Create the next line by picking the location, world coordinates(8,2.5), on the screen.CopyrightedMaterial10. We will next use the relative polar coordinates entry method, relative to thelast point we specified:Specify next point or [Close/Undo]: @3 90 [ENTER](Distance is 3 inches with an angle of 90 degrees.)

AutoCAD Fundamentals1-21CopyrightedMaterialReference Coordinate Systemaligned at the previous point11. Using the relative rectangularcoordinates entry method tocreate the next line, we canimagine a reference coordinatesystem aligned at the previouspoint. Coordinates are measuredalong the two reference axes.Specify next point or [Close/Undo]:@-1.5,1 [ENTER](-1.5 and 1 inches are measuredrelative to the reference point.)CopyrightedMaterial12. Move the cursor directly to the left of the lastpoint and use the direct distance entry techniqueby entering 6.5 [ENTER].13. For the last segment of the sketch, we can use the Closeoption to connect back to the starting point. Inside thegraphics window, right-mouse-click and a popup menuappears on the screen.CopyrightedMaterial14. Select Close with the left-mouse-button to connect backto the starting point and end the Line command.CopyrightedMaterial

1-22AutoCAD 2007 TutorialCopyrightedMaterialCreating CirclesThe menus and toolbars in AutoCAD 2007 are designed to allow the CAD operators toquickly activate the desired commands. Besides using the Draw toolbar, we can alsoselect the different Draw commands through the pull-down menus.1. In the pull-down menus, select:[Draw] [Circle] [Center, ice the different options available under the circle submenu: Center Point: Draws a circle based on a center point and a diameter or a radius. 2 Points: Draws a circle based on two endpoints of the diameter. 3 Points: Draws a circle based on three points on the circumference. TTR–Tangent, Tangent, Radius: Draws a circle with a specified radiustangent to two objects. TTT–Tangent, Tangent, Tangent: Draws a circle tangent to three objects.CopyrightedMaterial

AutoCAD Fundamentals1-23CopyrightedMaterial2. In the command prompt area, the message “Specify center point for circle or[3P/2P/Ttr (tan tan radius)]:” is displayed. AutoCAD expects us to identifythe location of a point or enter an option. We can use any of the fourcoordinate entry methods to identify the desired location. We will enter theworld coordinates (2.5,3) as the center point for the first circle.Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 2.5,3 [ENTER]3. In the command prompt area, the message “Specify diameter of circle:” isdisplayed.Specify diameter of circle: 2.5 [ENTER]CopyrightedMaterialCopyrightedMaterial4. Inside the graphics window, right-mouseclick to bring up the popup option menu.5. Pick Repeat Center, Diameter with theleft-mouse-button in the popup menu torepeat the last command.CopyrightedMaterial6. Using the relative rectangular coordinatesentry method, relative to the center-pointcoordinates of the first circle, we specify thelocation as (2.5,2).Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: @2.5,2 [ENTER]

1-24AutoCAD 2007 TutorialCopyrightedMaterial7. In the command prompt area, the message “Specify Diameter of circle: 2.50 ” is displayed. The default option for the Circle command inAutoCAD is to specify the radius and the last radius used is also displayedin brackets.Specify Diameter of circle 2.50 : 1.5 g the CAD Design1. In the pull-down menus, select:[File] [Save As] Note the command can also be activatedwith quick-key combination of[Ctrl] [Shift] [S].CopyrightedMaterial

AutoCAD Fundamentals1-25CopyrightedMaterial2. In the Save Drawing As dialog box, select the folder in which you want tostore the CAD file and enter GuidePlate in the File name box.Select the folderto store the file.CopyrightedMaterialEnter GuidePlate3. Pick Save in the Save Drawing As dialog box to accept the selections andsave the file.CopyrightedMaterialExit AutoCAD 2007To exit AutoCAD 2007, select File then choose Exit fromthe pull-down menu or type QUIT at the command prompt.Note the command can also be activated with quick-keycombination of [Ctrl] [Q].CopyrightedMaterial

1-26AutoCAD 2007 TutorialCopyrightedMaterialQuestions:1. What are the advantages and disadvantages of using CAD systems to createengineering drawings?2. How do the GRID and SNAP options assist us in sketching?3. List and describe the different coordinate entry methods available in AutoCAD ?4. List and describe two types of coordinate systems commonly used for planargeometry.5. Identify the following dMaterialCopyrightedMaterialTan, Tan, Radius

AutoCAD FundamentalsCopyrightedMaterialExercises: (All dimensions are in CopyrightedMaterial1-27

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1-2 AutoCAD 2007 Tutorial Introduction Learning to use a CAD system is similar to learning a new language. It is necessary to begin with the basic alphabet and learn how to use it correctly and effectively through practice. This will require learning some new concepts and skills as well as learning a different vocabulary.File Size: 914KBPage Count: 30Explore furtherAutoCAD tutorial for beginners pdf Free Downloadlearnmech.comAutocad software 2008 free download (Windows)en.freedownloadmanager.orgDownload AutoCAD Civil 3D 2017 (x64 . - Civil Engineeringwww.civilabc.comAn Introduction to AutoCAD for Beginnersimages-na.ssl-images-amazon. AutoCAD Exercises (free eBook) - Tutorial45tutorial45.comRecommended to you b