This document discusses reverse engineering, which is the process of redesigning an existing product to improve its functions, quality, and useful life. Reverse engineering involves measuring an existing physical object without drawings or documentation to develop a CAD model. This process reduces manufacturing costs and allows for redesigning undesirable features. Key steps include digitizing the physical object through contact or non-contact scanning, manipulating the collected data points to develop surface models, and generating CAD files that can be used for applications like manufacturing or medical imaging. The document outlines advantages like cost savings, quality improvements, and competitive advantages through reverse engineering.

1. Reverse Engineering
Presented By:
Ananya Upadhyay
ME/AMS/10006/15
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Birla Instituteof Technology,Mesra

2. Reverseengineering
• Reverse Engineering is a process of
redesigning an existing product to improve and
broaden its functions, add quality and to
increase its useful life.
• The main aim of reverse engineering is to
reduce manufacturing costs of the new
product, making it competitive in market.
• The duplication is done without the aid of
drawings, documentation or computer model.
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3. why reverseengineering?
• The original producer no longer produces the
product.
• There is inadequate documentation of product.
• Some bad features of the product needs to be
redesigned.
• To update obsolete materials or antiquated
manufacturing processes with more current,
less expensive technologies.
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4. Methodology
Physicalmodel
3D scanner
Pointclouddata
SurfaceModel
CAD readiness, Accuracy, Smoothness
CADmodel
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6. Digitizing
• Collecting data from physical part.
• Used when drawing of object is not available.
• Aim is to generate a 3D mapping of the
product in the form of CAD file.
• This requires acquisition of surface data,
which is large number of points on the product
surface.
• For this two types of processes are used:
contact and non contact method.
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7. Discretizationmethod
Contact method
• Requires contact between
the component surface & a
measuring tool.
• Uses Coordinate Measuring
Machine (CMM),
electromagnetic digitizer or
sonic digitizers to get
desired coordinates.
Non contact method
• Uses light as the main tool
• Uses white light or laser
scanners to scan 3D objects
to generate CAD design.
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8. Manipulationof data
• Basically, after completion of this a CAD
model of product is obtained.
• Used to fit a geometry to the large number of
points obtained from digitizing.
• The surface can be mathematically defined as
algebraic or parametric surface.
• Surface fitting techniques can be of two types:
interpolation and approximation techniques.
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9. Surfacefitting techniques
Interpolation technique
• Surface to be fitted passes
through all the data points.
• Used when the data points
are accurately measured
without any errors.
Approximation technique
• Surface represents a
generalized or best fit to the
data points.
• Used when large number of
data points are to be fitted.
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10. Generationof functional part
• The geometric model obtained, can be used as
the basis for variety of operations.
• Operations such as automated process
planning, automated manufacturing, automated
dimensional inspection and automated
tolerance analysis.
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11. Advantages of reverse engineering
• RE typically starts with measuring an
existing object, so that a solid model
can be deduced in order to make use
of the advantages of
CAD/CAM/CAE technologies.
• CAD models are used for
manufacturing or rapid prototyping
applications.
• Hence we can work on a product
without having prior knowledge of
the technology involved.
 Cost saving for developing new
products.
 Lesser maintenance costs
 Quality improvement
 Competitive advantages
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12. Applications
• ManufacturingField: To create a 3D virtual model
of an existing physical part for use in 3D
CAD, CAM, CAE or other software and to
analyze the working of a product.
• Medical Field:Imaging, modeling and replication
(as a physical model) of a patient's bone
structure
• Software engineering: To detect and neutralize
viruses and malware.
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13. Thank You
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