AUTOCAD

AutoCAD
 AutoCAD is an interactive drawing system designed to permit a user to construct or edit a     drawing on a graphics display screen. It was introduced in the early 1980’s by “Autodesk Inc.”,   California, U.S.A.
Drawing  :-  The combination of meaning ful lines is called a drawing.
 Why We Use AutoCAD
There are many reasons for using AutoCAD application are as following:-
1. It is used in the field of business to produce the better designs more quickly and more cheaply than their competitor.
2. It is used to construct the drawing in less amount of time.
3. It is used to produce better designs which are impossible to produce by manually.
4. The solid modeling created in CAD can be transferred to a Finite Element Analysis (FEA) program, which will then verify whether the suggested design will be capable of supporting the expected loads.
5. In CAD, you make the change immediately and print out a new drawing in minutes, or you can transmit it via E-mail or Internet all over the world instantly. 
Feature of AutoCAD
You can create fine drawings with hundreds of colors, line types, hatch patterns, presentation symbols and text styles. Even if you don’t like something about your presentation after you have finished it, you can quickly change it. It takes only a few simple steps to change the text style, color or line type and you can print a fresh copy of the drawing.
There are a number of ready-made presentation symbols and hatch patterns available in CADD that can be used to enhance the look of drawings. For example, a site planner can add tree symbols, shrubs, pathways, human figures, and other landscape elements to create a site plan. Similarly, an architect can use ready-made symbols of doors, windows, furniture, etc., to make a presentation.
In addition to preparing impressive presentations on paper, you can use CADD to make on- screen presentations. You can plug your computer into a projector and present your ideas on-   screen. Advanced CADD programs even allow you to create animated images. You can   illustrate how a building would appear while walking through it, or how a machine would function when different machine assembly
parts operate.
CADD provides the flexibility to make quick alterations to drawings. You can erase any portion Of a drawing with pinpoint accuracy. It takes only seconds to do a job that could take hours on a drawing board. In many cases, you won’t even have to erase the drawing to make the change.  You can rearrange the existing components of the drawing to fit new shape. This enables you to analyze design options with minimal effort.
The following are some of the editing capabilities of CADD:
      · Move or copy drawing elements
      · Enlarge or reduce parts of a drawing
      · Add one drawing to another
      · Stretch a drawing to fit new dimensions
      · Make multiple copies of a drawing element
      · Change the size and style of text
      · Change units of measure, accuracy and style of dimensions.

           2-D COMMAND