Submitted ByMohan Patwa

Submitted ToMr. Rajendra YadavMrs. Tapati Yadav

Computer Aided Design

Contents:-

•Engineering Drawing•Design Process•Computer Aided Design Procedure•Geometric Modeling•2D Model & 3D Model •Difference Between 2-D& 3-D Model•3-D Models•Comparison Of Various Modeling Technique•Geometric Modeling Example With Procedure•Analysis And Design Review•Analysis Results•Model Drafting Procedure

Engineering Drawing

A graphical language that communicates ideas and information from one mind to another.

Design Process

• It is an innovative and iterative process.• It is a decision making process.• It is a communication intensive activity in which both words and pictures are used.• Designs are subjected to problem solving constraints.

Specific Information Design Operation Outcome

General Information

EvaluationFeedback Loop

NO YESGo to the Next Step

Computer Aided Design Procedure

Recognition of need

Definition of problem

Synthesis

Analyze and Optimization

Evaluation and

Presentation

Geometric Modeling

Engineering & Analysis

Design review & Evaluation

Automated Drafting

Geometric Modeling

Geometric modeling is a branch of applied mathematics and computational geometry that studies methods and algorithms for the mathematical description of shapes.

Geometric Modeling

2D Modeling 3D Modeling

Line Model Surface Model Solid Model

2D Model & 3D Model

2D Model 3D Model

Difference Between 2-D & 3-D Model

Description 2-D Model 3-D Model

Use Simple 2D Objects Complicated 3D Objects

Co-ordinate System

WCB UCS

Views Generation Difficult Easy

End Lines Representation

(X,Y) (X,Y,Z)

Curve Edges Representation

Circle, Ellipse, Splines Etc. Suitably Spaced Generators

Complex Object Representation

Required Additional Views And Sectional Views

Complex Component Can Be Interpreted Correctly

3-D Models

WIREFRAME MODEL SURFACE MODEL SOLID MODEL

Comparison Of Various Modeling Technique

Wireframe Model Surface Model Solid Model

Automatic View Generation

Not Possible Not Possible Possible

Elimination Of Hidden Lines

Manually Guided May Be Possible Possible

Cross Sectioning Manually Guided Manually Guided Possible Even Automated Crosshatching Is Possible

Analysis Function Difficult Or Not Possible

Difficult Or Not Possible

Possible

NC Application Difficult Or Not Possible

Automatic Possible

Interpretation Ambiguous Relatively Easy Clear

Geometric Modeling Example With Procedure

Analysis And Design Review

Analysis Results

Model Drafting Procedure