The document discusses CAD modeling using CATIA software. It introduces geometric modeling concepts and the different workbenches in CATIA, including part design, sketcher, and assembly workbenches. The part design workbench allows users to create 3D solid models from 2D sketches using features like extrusion. The sketcher workbench is used to create 2D sketches and apply constraints. Dimensioning and other tools are also covered. CATIA is a leading CAD software that supports the entire design process from modeling to manufacturing.

1. Jimma Institute of Technology
Jimma University
Faculty of Mechanical Engineering
Course title: CAD/CAM and CIM
Course no. MENG 5321
ECTS 5 Cr.Hr:3
By: Amanuel Diriba
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2. LECTURE TWO
CHAPTER - 2
Model construction and product
design
Outlines
2.1 Geometric models in CAD
2.2 Introduction to CATIA V5 Software
2.2.1 Part modeling
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3. 2.1 Geometric models in CAD
• In 3D modeling we can have 3D views (visualize from
different angle, curve, surface, etc.)
There are three stage for modeling
1. Define an object
o Relate different features/objects.
o Each object must defined and then the relation
between object must be define
o Orientation in a coordinate system and dimension of
each object must be defined.
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4. Cont..
Example – 1
Example – 2
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bearing
shaft
Figure : shaft supported by bearing
1st Define the hole by specifying
- location of hole from orgin
- Depth of hole, and
- direction of hole.
Then relate the relate the hole
and surface (Top and bottom)

5. Cont..
2. Editing
• Editing is modifying (make change) of the existing
model.
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6. Cont..
3. Display / visualization aids
– Displaying modeling object
– Map onto screen coordinates.
Example
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• Location of each end point
must be defined with
corresponding screen coordinate.
(0,0,0)
(X,Y,Z)
(X,Y,Z)
(X,Y,Z)
(X,Y,Z)
(X,Y,Z)
(X,Y,Z)

7. 2.2 CATIA V5 Software
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8.  Introduction to CATIA V5 Software
• CATIA is an acronym for Computer Aided Three-
dimensional Interactive Application.
• It is one of the leading 3D software used by
organizations in multiple industries ranging from
aerospace, automobile to consumer products.
• CATIA is a multi platform 3D software suite
developed by Dassault Systems, encompassing CAD,
CAM as well as CAE.
• Dassault is a French engineering giant active in the
field of aviation, 3D design, 3D digital mock-ups,
and product lifecycle management(PLM) software.
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9. Cont..
• CATIA is a solid modeling tool that unites the 3D
parametric features with 2D tools and also addresses
every design-to-manufacturing process.
• In addition to creating solid models and assemblies,
CATIA also provides generating orthographic, section,
auxiliary, isometric or detailed 2D drawing views.
• It is also possible to generate model dimensions and
create reference dimensions in the drawing views.
• CATIA to be used across varied industries – from
parts design, surface design and assembly to sheet
metal design.
• CATIA can also be used for CNC.
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10. Cont..
• CATIA serves the basic design tasks by providing different
workbenches.
• A workbench is defined as a specified environment
consisting of a set of tools, which allow the user to
perform the specific design task in a particular area.
• The basic workbenches available in CATIA V5 are:
1. Part design Workbench
2. Wireframe and surface design workbench
3. Assembly design workbench, and
4. Drafting workbench
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11. Cont..
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27.  Color scheme
• CATIA allows you to use various color schemes as the
background color of the screen and for displaying the
entities on the screen.
• To change the color scheme,
– choose Tools >options from the menu bar,
– choose Display in the general option
– choose visualization tab
– select background
– ok
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31.  HOT KEYS used in CATIA
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32.  Sketcher Work Bench
• The sketcher is used to create 2D sketches of Designs,
and apply constraints to the sketched geometry.
• The sketcher is now the main environment for developing
2D profiles that will be used to build solid model.
• The sketcher is a parametric design tool
• It allows you to quickly draw the approximate shape of a
design, and then assign constraints to complete the
shape definition.
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33.  Sketcher Work Bench Tool Bars
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36.  Part design workbench
• The part design workbench is a parametric and feature-
based environment, in which you can create solid
models.
• Solid parts are usually created from 2D profiles that are
extruded or revolved to from base feature.
• The part design task is tightly integrated with a 2D
sketching tool.
• After drawing the sketch, exit the Sketcher workbench
and convert it into a feature.
• A library of features is provided to allow user to add
additional details to a base part
• Parts can be modified by selecting their features in the
specification tree.
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37. Cont..
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38. Cont..
 Create parts or components
Start > mech. Part > sketch > coordinate selection (XY
or YZ or ZX plane) > sketch
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62.  Dimensioning
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63. Thank you
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