AutoCad is the most popular Computer Aided Design software from Autodesk, a leading US based Company

Ex.no:INTRODUCTION OF AUTO CAD SOFTWARE FOR DRAFTING AND MODELING

Date:

Aim:

To study the capabilities of AutoCAD software for drafting and modeling.

Introducton:Auto Cad is the most popular Computer Aided Design software from Autodesk, a leading US based Company.

Apart from AutoCad, Autodesk has a spectrum of products for various disciplines as follows:

Mechanical AutoCAD Mechanical, Autodesk Inventor Series.

AEC Architectural Desktop, Autodesk Civil Design, Autodesk VIZ, Autodesk Revit.

GIS Autodesk MAP, Autodesk Land Desktop, Autodesk Map Guide.

R to V Autodesk Raster design.

AutoCAD is a generalpurpose computeraided drafting (CAD) program which can be used to create all kinds of line drawings. It is one of the most widely used CAD packages and is used for all types of drawing in a variety of different disciplines. A few of the applications for which AutoCAD is being used: Architectural drawings of all kinds

Interior design and facility

Workflow charts and organisational diagrams

Proposals and presentations

Drawings for electronic, chemical, civil, mechanical, automotive, and aerospace engineering applications

Plots and other representations of mathematical and scientific functions

Theatre set lighting designs

Musical scores

Technical illustrations and assembly diagrams

Company logos

Greetings cards

Line drawings for the fine arts

Co-ordinate Systems in AutoCAD

All drawings are super imposed on an invisible grid, or co-ordinate system, with a horizontal X axis and a vertical Y-axis.

You can establish grid and snap settings that match the units of the co-ordinate system or some multiple or fraction of it.

As you draw, you can enter coordinate to locate a point. For example, you can draw a line by starting it at the 2,2 location in the coordinate system and end it at the 8,2 location, as shown in the above figure. This is called absolute coordinate system.

The X value of a Cartesian coordinate specifies the horizontal distance, and the Y value specifies the vertical distance. The origin point (0,0) indicates where the two axes intersect.

Absolute co-ordinate values are based on the origin (0,0). Relative co-ordinate values are based on the very last point entered. They are useful for finding a serious of points that are at a known distance.

Absolute Co-ordinate system (x,y)To enter an absolute coordinate, specify a point by entering its X and Y values in the format x, y.Command: l

LINE Specify first point: 2,2

Specify next point or [Undo]: 8,2

Specify next point or [Undo]: 8,6

Specify next point or [Close/Undo]: 5,6

Specify next point or [Close/Undo]: 5, 4

Specify next point or [Close/Undo]: 2,4Specify next point or [Close/Undo]: cRelative rectangular Co-ordinate system (@ x distance, y distance)Use relative coordinates when the position of a point with respect to the previous point.Use relative rectangular coordinate is represented in the following format:

@x-displacement, y- displacement

Command: l

LINE Specify first point: 2,2

Specify next point or [Undo]: @6,0

Specify next point or [Undo]: @0,4

Specify next point or [Close/Undo]: @-3,0

Specify next point or [Close/Undo]: @0,-2

Specify next point or [Close/Undo]: @-3,0

Specify next point or [Close/Undo]: cPolar Co-ordinate system (@ distance < angle)

Polar Co-ordinate system uses a distance and an angle with reference to the previous point to locate a point. Angles are measured in anti-clockwise direction taking 0 towards right. The relative polar coordinate is represented using the following format.

@distance