caed chapter no1
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Computer Aided Engineering Drawing
Introduction to AutoCAD
Chapter No 1
Sir Syed University of Engineering & Technology
Computer Engineering DepartmentUniversity Road, Karachi-75300, PAKISTAN
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Text Book
Text Book: Mastering AUTOCAD 14
By George Omura
Course Outline is available at CAED course
website.
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Course Outline
Introduction to AutoCAD for Windows Overview of AutoCAD, Program Files, File Extension, Drawing Editor in
AutoCAD
Basic Concept of AutoCAD Co-ordinate System, Drawing Aids, Display Control, Limits command
Entity Draw Command in AutoCAD Line, Point, Circle, Arc, Ellipse, Donut, Polyline, Polygon, Sketch, Text
Editing Tools in AutoCAD Erase, Move, Fill, Break, Rotate, Divide, Scale, Mirror, Extend, Fillet,
Chamfer, Array
Advanced AutoCAD Commands & Concepts Hatch, BHatch, Printing, Dimension, Layer, Blocks, 3D Drawing
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Overview of CAD
CAD stands for Computer-Aided Design.
Computer Aided Design (CAD) is the latest
breakthrough in the modern technology thatbecame a part of variety of professionals likeEngineers, Architects and Interior Designers.
CAD helps in the presentation of EngineeringDrawings, Architectural Drawings, InteriorDesigns, Work-flow charts, OrganizationalDiagrams and Company logos etc.
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Overview of CAD
AutoCAD is a general purpose computer aideddrafting application program designed for use onsingle-user, desktop personal computers andgraphic workstations.
An AutoCAD drawing is made up of entities. Thesecan be either simple graphic primitives (such aslines, arcs, circles, text, and so on) or blocks
(which are groups of entities). A block is a group ofentities that can be manipulated as a single unit.
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Overview of CAD
Designs and drawings can be standardized
and more accurately presented by using
AutoCAD.
Drawings drawn on AutoCAD can also be
transmitted to CAM (Computer Aided
Manufacturing) system for the actual
production of the product design.
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Overview of CAD
An AutoCAD drawing is made up of objects.
These can be either simple graphic objects
(such as lines, arcs, circles, text, etc.) or blocks
(which are groups of objects).
Each object also has certain attributes
associated with it, such as line style, text font,
or colour.
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Overview of AutoCAD R14
AutoCAD R14 for windows provides aGraphical user Interface (GUI) similar to thatof any other windows package that furthersimplifies access to commands.
Pull-down menus, dialog boxes, scroll barsand command icons adhere to Windows
standards. The open architecture of thisproduct makes it much easier for thedevelopers to create new applications thatcan run with AutoCAD.
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Advantages of AutoCAD
Generation of graphic images on a computer
Modification of graphic images on a
computer
Printing these images as a hard copy by aprinter or a plotter
Retrieval of designing information
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Advantages of using computer
over paper work
Easier creation of the drawing
Easier correction of the drawing
Easier visualization of the drawing
Increase the accuracy of the drawing
Increase the life of the drawing
Drawing can be stored and easily
referenced for the further modification
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Hardware and Software
Requirements for AutoCAD
Minimum IBM compatible 80386 computers
At least 64MB of RAM. AutoDesk
recommend at least 128 MB.
Hard disk with at least 50MB or more space.
One floppy Drive
Digitizing tablet or mouse
Printer or plotter A video display adapter (VGA) that is
capable of displaying Windows
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The Program Files in AutoCAD
Number of subdirectories are present in AutoCADsdirectory.
ADS (AutoCAD Development System):Files contain in this directory are programs andsample codes for ADS.
API (Application Programming Interface):Files in this directory are for programmers interestedin linking applications to the Advanced ModelingExtension like Access 7, Excel, and FoxPro.
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The Program Files in AutoCAD
ASE (AutoCAD SQL Extensions):
Files in this directory are for database programmers
interested in linking AutoCAD drawings to the SQL
servers.
Fonts:
Contain the standard font-definition files.
Sample:
Contain the sample drawing and AutoLisp programs.
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The Program Files in AutoCAD Source:
Contain the ASCII source file for many of thesupport files.
Support:Contain the files that support variety of AutoCADsfunctions such as linetype, fonts and pattern etc.
Tutorial:
Contain the sample files used in conjunction withthe tutorial that appear in various AutoCADmanuals.
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Ways of Entering Commands
Command Entry
Data Entry
Entity Selection
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Ways of Entering Commands
Command Entry:
All the commands can be entered from thekeyboard, screen menu, pull-down menu or fromthe button menu.
Data Entry:
When the command is invoked, a user has tosupply additional information to specify how,
where or upon what the requested action shouldbe performed. A user responds to AutoCAD byentering numeric values, specifying angles anddistances.
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Ways of Entering Commands
Entity Selection:
One or more entities can be selected for
processing. This collection of entities (just
clicking) or remove entities from (shift+click),the selection set. AutoCAD highlightthe
selected entities using dotted lines
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Drawing Editor in AutoCAD
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AUTOCAD Command Line Area
The command line area is located by defaultat the bottom of the AutoCAD applicationwindow, just above the status bar.
This is the area where AutoCAD prompt youthe next step in a command sequence thethree lines in the command: line area displaythe three most recent prompts and command,with the current one of the bottom line.
The current command line separated from theothers by horizontal line.
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Setting Up The Initial Drawing
Area
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Drawing Aids Dialog Box
The Drawing Aids dialog box enable you tospecify several setting of the drawing area.
The snap area enables you to specify theincremental movement of your cursor acrossthe drawing area.
In the grid area, you can specify the spacingof the grid dots displayed within the drawinglimits
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File Format in Auto CAD
When starting from scratch AutoCAD doesnt
need a file name for the drawing.
(all drawings have an extension ofDWG).
After you have specified the name of the
drawing using the Save Drawing as dialog
box, AutoCAD will automatically save thedrawing under the current name without
opening a dialog box.