CAED Chapter No1

8/14/2019 CAED Chapter No1

1/24

Computer Aided Engineering Drawing

Introduction to AutoCAD

Chapter No 1

Sir Syed University of Engineering & Technology

Computer Engineering DepartmentUniversity Road, Karachi-75300, PAKISTAN


2/24

2

CAED - Chapter No 1 Introduction to CAED

Text Book

Text Book: Mastering AUTOCAD 14

By George Omura

Course Outline is available at CAED course

website.


3/24

3


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


4/24


5/24

5


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.


6/24

6


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.


7/24

7


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.


8/24

8


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.


9/24

9


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.


10/24

10


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


11/24

11


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


12/24

12


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


13/24

13


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.


14/24

14


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.


15/24

15


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.


16/24

16


Ways of Entering Commands

Command Entry

Data Entry

Entity Selection


17/24

17



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.


18/24

18



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


19/24

19


Drawing Editor in AutoCAD


20/24

20



21/24

21


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.


22/24

22


Setting Up The Initial Drawing

Area


23/24

23


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


24/24

24


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.

CAED Chapter No1

Documents

Transcript of CAED Chapter No1