PPT: Geometric Modeling | Manufacturing Engineering - Mechanical Engineering PDF Download

 Page 1


CAD Software
CAD software can be divided based upon the 
technology used:
1. 2-D drawing. Its applications include,
?
·   mechanical part drawing
?
·   printed-circuit board design and layout
?
·   facilities layout
?
·   cartography
2. Basic 3-D drawing (such as wire-frame modelling)
3. Sculptured surfaces (such as surface modelling)
4. 3-D solid modelling
5. Engineering analysis
Page 2


CAD Software
CAD software can be divided based upon the 
technology used:
1. 2-D drawing. Its applications include,
?
·   mechanical part drawing
?
·   printed-circuit board design and layout
?
·   facilities layout
?
·   cartography
2. Basic 3-D drawing (such as wire-frame modelling)
3. Sculptured surfaces (such as surface modelling)
4. 3-D solid modelling
5. Engineering analysis
Geometric Modeling
Geometric modelling refers to a set of 
techniques concerned mainly with 
developing efficient representations of 
geometric aspects of a design. Therefore, 
geometric modelling is a fundamental part 
of all CAD tools.
Page 3


CAD Software
CAD software can be divided based upon the 
technology used:
1. 2-D drawing. Its applications include,
?
·   mechanical part drawing
?
·   printed-circuit board design and layout
?
·   facilities layout
?
·   cartography
2. Basic 3-D drawing (such as wire-frame modelling)
3. Sculptured surfaces (such as surface modelling)
4. 3-D solid modelling
5. Engineering analysis
Geometric Modeling
Geometric modelling refers to a set of 
techniques concerned mainly with 
developing efficient representations of 
geometric aspects of a design. Therefore, 
geometric modelling is a fundamental part 
of all CAD tools.
Geometric modeling is the basic of many 
applications such as:
•
Mass property calculations.
•
Mechanism analysis.
•
Finite-element modelling.
•
NC programming.
Requirements of geometric modelling include:
•
Completeness of the part representation.
•
The modelling method should be easy to use by designers.
•
Rendering capabilities (which means how fast the entities 
can be accessed and displayed by the computer).
Page 4


CAD Software
CAD software can be divided based upon the 
technology used:
1. 2-D drawing. Its applications include,
?
·   mechanical part drawing
?
·   printed-circuit board design and layout
?
·   facilities layout
?
·   cartography
2. Basic 3-D drawing (such as wire-frame modelling)
3. Sculptured surfaces (such as surface modelling)
4. 3-D solid modelling
5. Engineering analysis
Geometric Modeling
Geometric modelling refers to a set of 
techniques concerned mainly with 
developing efficient representations of 
geometric aspects of a design. Therefore, 
geometric modelling is a fundamental part 
of all CAD tools.
Geometric modeling is the basic of many 
applications such as:
•
Mass property calculations.
•
Mechanism analysis.
•
Finite-element modelling.
•
NC programming.
Requirements of geometric modelling include:
•
Completeness of the part representation.
•
The modelling method should be easy to use by designers.
•
Rendering capabilities (which means how fast the entities 
can be accessed and displayed by the computer).
Geometric Modeling Approaches
The basic geometric modelling approaches available to 
designers on CAD/CAM systems are:
1. Wire-frame modeling.
2. Surface modeling.
3. Solid modeling.
Page 5


CAD Software
CAD software can be divided based upon the 
technology used:
1. 2-D drawing. Its applications include,
?
·   mechanical part drawing
?
·   printed-circuit board design and layout
?
·   facilities layout
?
·   cartography
2. Basic 3-D drawing (such as wire-frame modelling)
3. Sculptured surfaces (such as surface modelling)
4. 3-D solid modelling
5. Engineering analysis
Geometric Modeling
Geometric modelling refers to a set of 
techniques concerned mainly with 
developing efficient representations of 
geometric aspects of a design. Therefore, 
geometric modelling is a fundamental part 
of all CAD tools.
Geometric modeling is the basic of many 
applications such as:
•
Mass property calculations.
•
Mechanism analysis.
•
Finite-element modelling.
•
NC programming.
Requirements of geometric modelling include:
•
Completeness of the part representation.
•
The modelling method should be easy to use by designers.
•
Rendering capabilities (which means how fast the entities 
can be accessed and displayed by the computer).
Geometric Modeling Approaches
The basic geometric modelling approaches available to 
designers on CAD/CAM systems are:
1. Wire-frame modeling.
2. Surface modeling.
3. Solid modeling.
Wire-frame Modeling
Wire-frame modelling uses points and curves 
(i.e. lines, circles, arcs), and so forth to 
define objects.
 The user uses edges and vertices of the part 
to form a 3-D object 
Wire-frame model                                                         part