autocad 2d module 02 pdf

8/14/2019 Autocad 2d Module 02 PDF

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Learning Outcomes:

AutoCAD Self-paced Learning Modules

AutoCAD 2DModule 2

Getting Started

When you have completed this module, you wil l be able to:

1. Describe an AutoCAD command, option prompt, defaults, drawing name, drawing

extensions, and drawing templates.2. Describe and apply the commands NEW, QSAVE, OPEN, and CLOSE. Demonstrate

you can use them by starting new drawings, naming the drawings, saving them to aspecified folder location, open existing drawings, and closing drawings.

AutoCAD CommandsMost work in AutoCAD

consists of givinginstructions, tellingAutoCAD what youwant it to do. Thoseinstructions are calledcommands. Most ofthe time you will beentering commandsusing the commandline window, a pull-down menu or atoolbar menu. Figure2-1 shows the LINEcommand beingentered using all threemethods.

Figure 2-1

Different Methods of Executing the LINE Command

Regardless of the way you enter commands, AutoCAD doesn't really know or care where the

command was initiated. To AutoCAD, all commands look alike. Therefore, you have the choiceas to which method you want to use. There is no right or wrong way. Throughout the AutoCADModules, you will be shown different ways of entering each command. You can decide whichone(s) you want to use.

Executing Commands

Many menu items execute commands automatically but a lot of the time it is up to you to do this.

Executing a commandis your way of telling AutoCAD that you are finished and it is AutoCAD'sturn. You can execute a command by either pressing the enter key or the space bar on thekeyboard.

Getting Started The CAD Guys Ltd. Copyright 2004 - 2007 Module 2


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2 - 2 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-06-30

Repeating the Last Command

AutoCAD can be very repetitive. To work faster, you can repeat the last command that was

executed by pressing the enter key, the space bar, or clicking the right mouse button.

Option Prompts

Command: LINEAfter you execute most commands,AutoCAD will respond with an optionprompt. An option promptis AutoCADasking you a question in response to acommand or requesting some input.Figure 2-2 shows three commands and theoption prompts returned. User input is inbold. In the first command LINE, you cansee that the AutoCAD option prompt isSpecify first point and the user responds2,2. AutoCAD then asks Specify next

point or [Undo]:. As you can see, it isimportant for you to watch the commandline window to see what AutoCAD is askingfrom you next.

Defaults

Specify first point: 2,2Specify next point or [Undo]: @2,0Specify next point or [Undo]:

Command: FILLETCurrent settings: Mode = TRIM, Radius = 0.2500Select first object or [Polyline/Radius/Trim]: RSpecify fillet radius : 0.25Select first object or [Polyline/Radius/Trim]:Select second object:

Command: REGEN

Regenerating model.

Figure 2-2

Option Prompts

AutoCAD sets defaults for almost

everything. A defaultis the value

AutoCAD uses if the user doesnot supply one. The default isinside angle brackets "< >". If youwant to use the default value,

simply respond by pressing theenter key or the space bar. SeeFigure 2-3.

Command Options

Command options are selections

you can choose from to changethe default if required. Commandoptions are inside "[ ]" as you can

see in Figure 2-3. An example ofthe defaults and options for theCIRCLE command are shown in

the second line of the figure:Specify center point for circle or

[3P/2P/Ttr (tan tan radius)]:

Specify center point for circle - is

the default.

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

(The default is Specify center point for circle)Specify radius of circle or [Diameter] :

(The default is radius of circle, size 3.0000)Command:

Command: FILLETCurrent settings: Mode = TRIM, Radius = 0.2500(The default Mode is TRIM and Radius is 0.2500)

Select first object or [Polyline/Radius/Trim]:(The default is Select first object)

Command: TEXT

Current text style: "Standard" Text height: 0.2000(The default text style is Standard and height 0.2000)

Specify start point of text or [Justify/Style]:(The default is Specify start point of text)

Specify height :(The default height is 0.2000)

Specify rotation angle of text :(The default rotation angle is 0)

Text:

Figure 2-3

AutoCAD Defaults

[3P/2P/Ttr (tan tan radius)] - are the options.



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AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-06-30

When you want to accept the default value for any option prompt, simply

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press the enter key or space bar. Do not re-enter the value as this will slow

your drawing speed. For example:

Specify fillet radius : If you want to use 0.25, press the enter key or

space bar here.

AutoCAD's option prompts will be a combination of upper and lower case

letters. Only enter the letters in uppercase as this will help you workfaster. For example:

Command: LENGTHEN

Select an object or [Delta/Percent/Total/DYnamic]:(For Delta enter D, for Percent enter P, for Total enter T, and forDYnamic enter DY.)

AutoCAD Drawings

An AutoCAD drawing is a database file containing graphical and non-graphical data. The file

must have the extension .DWG. To be able to do anything in AutoCAD, you must have at least

one drawing open. You can open multiple drawings at the same time and switch betweenthem at will. Only one drawing can be active at a time. The active drawingis the drawingcurrent being affected by the commands you are entering.

The NEW command is used to create a new drawing. All new drawings must be started from atemplate file. All lab exercises in this course will use supplied template files.

AutoCAD Command: NEWThe NEW command is used to create and open a new drawing.

Shortcut: CTRL+N

2004-2008

2000-2002



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If the file dialogue box does not open for the NEW command, enter theFILEDIA command and set the value to 1 as shown below:

Command: FILEDIA

Enter new value for FILEDIA : 1

Command:

Drawing Templates

A drawing template is a

drawing file with defaultsand standards set by thecreator. A templatedrawing is simply anAutoCAD drawing savedas a template file.AutoCAD assigns it the file

extension name .DWT.For the ten templates you

will be using for theAutoCAD Modules, thetitleblock and border havebeen drawn and theAutoCAD standards anddefaults were set for thiscourse. The AutoCADCustomization Moduleswill teach you how tocreate your own templatefiles.

In 2004-2008, the NEW

command opens theSelect Template dialoguebox as shown in Figure2-4.

In 2000-2002, the NEW

command will initiate theCreate New Drawingdialogue box as shown inFigure 2-5. To start a new

drawing with a template,click the third icon fromthe left and the words Usea Template will display aswell as the availabletemplates.

Getting Started

Figure 2-4

Select Template Dialogue Box 2004-2008

Figure 2-5

Create New Drawing Dialogue Box for 2000-2002

The CAD Guys Ltd. Copyright 2004 - 2007 Module 2


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Drawing Templates for the AutoCAD Modules

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There are 10 drawing templates that are an important part of the AutoCAD Modules. You must

use the templates as instructed in the lab exercises as they contain the keys you will use tocheck your drawings. You will learn how to do this in Module 3. The template drawings youwill be using and their actual size are as follows:

AutoCAD Module Templates

English Templates Metric Templates

Template Name

Module Template A

Module Template B

Module Template C

Module Template D

Paper Size

81/2 X 11 in

11 X 17 in

17 X 22 in

22 X 34 in

Template Name

Module Template A4

Module Template A3

Module Template A2

Module Template A1

Paper Size

210 X 297 mm

297 X 410 mm

410 X 594 mm

594 X 820 mmModule Template Layout English N/A Module Template Layout Metric N/A

Drawing Name

Figure 2-6

AutoCAD Modules Template Files

When you create a new drawing,

by default, AutoCAD will namethe drawing Drawing1.dwg, seeFigure 2-7. The name willdisplay in the upper left corner of

the graphic window. If you openmore than one drawing in yourAutoCAD session, they will benamed Drawing2.dwg,Drawing3.dwg etc.

Figure 2-7

AutoCADs Default Drawing Name

It is important for you to name a new drawing as soon as possible after you start it. Getting into

this habit will save you many hours looking for lost drawings. To save and name a newdrawing, use the QSAVE command. If the drawing you are saving is not yet named, QSAVEwill open the Save Drawing As dialogue box and allow you to select the drive, folder, anddrawing name as shown in Figure 2-8.

Command options are selections you can choose from to change thecommand default, if required. Command options are inside "[ ]".

For example, the option prompt for the FILLET command:

Select first object or [Polyline/Radius/Trim]:

Select first object - Is the default.

[Polyline/Radius/Trim] - Enter either a P, R or T to change the default.



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AutoCAD Command: QSAVEThe QSAVE command is used to save your drawing in the .dwg file.

Shortcut: CTRL+S

2004-2008

2000-2002

Saving Your Drawings

It's a good idea to save a new drawing immediately after you start it, then every 15 minutes afterthat. If you have a power failure or your computer freezes up, the maximum you can lose is thelast 15 minutes of drawing time. When you save a drawing, it creates a file on the disk drive.Choose the disk drive and the folder location on that drive using the Save Drawing As dialoguebox. See Figure 2-8. The first time you save your drawing, you will be asked for its name.Once it is named, you can save it quickly with the QSAVE command. As soon as a drawing issaved, the file location and the drawing name will display in the top left corner of the graphicwindow. See Figure 2-9.

Figure 2-8

Save Drawing As Dialogue Box



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Figure 2-9

A Named Drawing

Drawing File Extension Names

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AutoCAD uses many different file

extension names as you will see asAutoCAD File Extensions

you work your way through theAutoCAD Modules. The first threeyou must know are .dwg, .dwt, and

.bak. See Figure 2-10.

AutoCAD creates a .bak file when

you save a previously filed drawing.When you save the drawing,

.dwg

.dwt

.bak

AutoCAD Drawing

AutoCAD Drawing Template

Back-up file

Figure 2-10

AutoCAD File Extension Names

AutoCAD changes the extension of the existing drawing on the disk to .bak and creates a newfile with the extension .dwg. If a drawing file ever gets lost or corrupted, you can change theextension name of the .bak file to .dwg and open it in AutoCAD.

Opening an Existing Drawing

To open a previously saved drawing from a disk drive, use the OPEN command. With the

Select File dialogue box, you can find the folder location and the drawing you want to open.

See Figure 2-11. The OPEN command will show a small drawing preview of each drawing tohelp you select the correct one.

AutoCAD Command: OPENThe OPEN command is used to open a previously saved drawing

Shortcut: CTRL+O

2004-2008

2000-2002



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Figure 2-11

Select File Dialogue Box

Closing a Drawing

To close a drawing, use the CLOSE command. If you have modified the drawing and have not

saved those changes, AutoCAD will ask you if you want to save the drawing before closing.

AutoCAD Command: CLOSEThe CLOSE command is used to close a drawing.

Shortcut: none

When you save a drawing for the first time in AutoCAD, it will add theextension .dwg to the file name. When you save the drawing, AutoCADcreates a .bak file from the previous filed .dwg file. AutoCAD changes theextension of the existing drawing on the disk to .bak and creates a new filewith the extension .dwg. If a drawing file ever gets lost or corrupted, you can

change the extension name of the .bak file to .dwg and open it in AutoCAD.



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Cancelling or Aborting a Command

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You can cancel or abort any command by pressing the ESC key on the keyboard. Sometimes

you must press it twice to completely abort the command and return you the command prompt.

The Enter key or the space bar on the keyboard are used to execute the

active command. If there is no active command and you press the spacebar, Enter key, or click the right mouse button, AutoCAD will repeat the lastcommand.

When an AutoCAD pull-down menu item displays a small triangle, it

means that it contains a flyout menu. When a menu item has 3 dotsfollowing the name, it means it will open a dialogue box. A check mark infront of the name means that the item is enabled. Notice how a menuitem will also display the shortcut key. For example: Text Window F2.

The Esc key, located in the upper left corner of the keyboard, is a very

important key when using AutoCAD. When pressed, it will cancel or abortany command and return you to a command prompt. You will be using this

key frequently while working in AutoCAD.

The Key Principles in Module 2

1. Regardless of the way you enter commands, AutoCAD doesn't really know or care

where the command was initiated. To AutoCAD, all commands look alike.

2. In an AutoCAD command, the default is inside angle brackets "< >" and the options areinside "[ ]".

3. The enter key or the space bar on the keyboard are used to execute the active

command. If there is no active command and you press the space bar, enter key, orclick the right mouse button, AutoCAD will repeat the last command.

4. The extension for an AutoCAD drawing file is .DWG and for an AutoCAD template file, it

is .DWT.

5. The Esc key will cancel or abort any AutoCAD command or process.



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Lab Exercise 2-1

Drawing Specifications

Time Allowed: 20 Min.

Name

N/A

Template

N/A

Units

N/A

Text Style

N/A

Font

N/A

Note: Color, Linetype, and Lineweight are all < ByLayer< unless otherwise instructed.

Layering Scheme

Objects on Layer Name Color Linetype

N/A

Instructions:

1. Start AutoCAD.

Lineweight

2. IMPORTANT STEP - Unless otherwise instructed, each time you start a lab exercise for this course,the graphic screen should be set as shown below:

All Versions

2006-2008

2000-2005

2004-2008

2000-2002

3. a) Using the NEW command, start a new drawing using the template :Module Template A

b) Save the drawing in the folder:

CAD Courses/AutoCAD 2D/Lab ExercisesNote: You should have this folder structure alreadycreated on your hard drive as instructed in the ModuleIntroduction 2. If you have not yet completed ModuleIntroduction 2, do it now.

c) Save it with the name:AutoCAD 2D Lab 02-1

d). Using the CLOSE command, close the drawing.



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4. a) Start a new drawing using the template:

Module Template A2

b) Save the drawing in the folder:CAD Courses/AutoCAD 2D/Lab Exercises

c) Save it with the name:

AutoCAD 2D Lab 02-2

d) Close the drawing.

5. a) Start a new drawing using the template:

Module Template D

b) Save the drawing in the folder:CAD Courses/AutoCAD 2D/Lab Exercises

c) Save it with the name:AutoCAD 2D Lab 02-3

d) Close the drawing.

6. Using Windows Explorer, find the folder:

CAD Courses/AutoCAD 2D/Lab Exercises

It should have a list of 3 drawings as follows:

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Author's Comments: Don't be concerned If the drawing sizes are different in your list then the

ones shown in the figure. Each version of AutoCAD could create a different file size.


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