CADDComputer Aided Design & Drafting

Presented By:Jigar Goswami (06DME019)Sharad Parekh (06DME020)

Definition

• CAD is defined as the use of computers to help in generation, modification, analysis or optimisation of a design.

• Examples of application programs are stress-strain analysis, heat transfer calculation, fluid flow calculation etc...

CAD & CADD

• CAD software is meant for drafting purpose alone. This software is not useful for design.

• Example: Auto CAD

• CADD software is meant for both design & drafting.

• Example: I-DEAS, PRO-Engineer, CADDS C, Unigraphics, Ansys etc...

Advantages

• CADD software is a “User Friendly” package.• It has a very high speed & accuracy in solving a

specific problem.

Increase in the productivity

• By using CADD in design & drafting, the productivity is greatly increased.

• The designer can visualise the product and its sub assemblies. the period of time required in synthesizing, analysing and documenting the design is very much reduced and it result in to increase in to productivity.

Improvement in quality of design

• A Number of design alternatives can be analysed. Final design will have little or no error and greater accuracy is attained.

Less Time for Design & Analysis

• By using CADD software, any complicated component can be designed and analysed in a very short period of time.

High Accuracy

• Drawing produces by CADD have greater accuracy than the manually produces ones.

• In CADD “Zooming” of a drawing is possible. i.e. A drawing can be ‘blown up’ to show components in detail. With this facility minute details can be drawn with a great accuracy.

No Repetition

• Once a design or drawing is completed, it can be stored in the computer memory and can be reused as and when it is required.

• If any modification is required in certain parts, that part alone can be modified in the existing drawing itself.

Database

• The data base for the manufacturing process can be created to meet the different requirements.

• The database is a collection of drawings and dimensions of the components, material specification, invoice details etc...

Colour Graphics

• It helps to identify the different parts on the drawings very easily.

• A designer can view the design and drawings on the screen. A drawn object can be rotated and seen in different views. If any modification is required, it can be done very quickly and shown on the screen.

• Different colours can be used to distinguish the various parts and also any part of the drawing can be enlarged or reduced in size and can be analysed.

• The simulation of the design can be done and the working of any component can be tested.

• In General, the time required for design and development process is reduced to great extent.

Application

Facts

• Even though CADD is used in various fields of engineering , more than 60% of the CADD application are in “ Mechanical Engineering”.

Thank You!