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Student：49912109 Chao-Wen Chen
49912909 Li-Wei Shen
Teacher：Ru-Li Lin Associate Professor
Department of Mechanical Engineer
Southern Taiwan University of Science and Technology
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Title
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Introduction to Reverse Engineering
3D Scanner Category
System Comparison
Workflow
CAD / CAM machining & Rapid Prototyping
Data Classification
Video
Q&A
References
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Introduction to Reverse Engineering
Development of computer hardware and software make 3D CAD/CAM has
been rapid progress. Then in modeling is growing up to the forwardengineering and reverse engineering.
 Reverse engineering is for no original design drawing files. For example :
Curved surface , samples or models by hand made.
 Integration of contact and non-contact 3D measurement system is mainly
used to measure the complex surface shape of the point data.
 Imitation working model, the follow-up after editing, the work is usually
performed imitation, such as shoe mold, golf club, that will be able to copy
it.
 To put CAM into the machine tools or rapid prototyping and the model will
be produced.
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3D Scanner Category-Contact Type
Advantage：
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High accuracy and reliability.
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Nothing to do with the reflection of
the work piece.
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Suitable for general basic shape
measurement.
Disadvantage：
E-trigger probe and CMM
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Use special fixtures.
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Probe ball need to be revision , easy to
abrasion caused by contact force.
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Incorrect operation easily damage the
work piece.
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Low speed.
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The Contact Probe of The Dynamic Principle
Measuring head touched the object , the signal will turn ON to become
OFF and mark the point.
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Contact probe scanning pattern of results
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3D Scanner Category-Contactless Type
Contactless Type ：
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Blu-ray 3D laser scanner
CCD grating 3D scanner
Advantage：
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Not need to do the probe radius
compensation.
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Measuring speed is very fast.
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Not considered material.
Disadvantage：
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Poor measurement accuracy.
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The color and curvature are
susceptible to limit.
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Need to handle the mixed signal.
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Roughness of the surface will
affect the measurement results.
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3D laser scanner of The Dynamic Principle
Non-contact measurement system is used to LED or laser light source, a
condenser lens direct rays of the work piece to be measured by the object,
the reflection of light can detect the position of the coordinate values ​from
the sensor.
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CCD grating for dynamic 3D scanner principle
Such principle as the corresponding function method is finding the relationship
between measurement plane spatial coordinates and CCD imaging methods.
When you scan , the space corresponding function will compute to reduce the
dislocation problem.
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Non-contact 3D scanning of graphical results
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System Comparison
Contact Type
Contactless
Type(Laser)
Contactless
Type(CCD grating)
Time
Longer
Medium
Fast
Range
Point
Line
surface
Density
Sparsely point
High Density point
Most High Density
point
Curve surface
Hard
Partial limit
Limitless
Material
restrictions
High hardness
Limitless
Limitless
Accuracy of
measurement
<5μm
<50μm
<50μm
Measurement place
Fixed Platform
Fixed Platform
Easy to carry
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Workflow
Blu-ray 3D laser scanner
3D CAD
Model
CAD/CAE
Scanner
complete
Adjustment
Create 3D model
CAM
RP
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Produce single-point data
Using 3D laser scanner to scan model. There will need 5 surface scan data.
If the data is not enough , it will not completely to go next stage.
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Overlap Each Data
After the scan is complete and you can overlap each data. To select
obvious characteristic curves to overlap and you can get the original
object and a similar file data after completion.
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Converted Into A Triangle Mesh
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Capture Features And Contour Lines Turn Into The Entity
Performed The Entity Reconstruction
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CAD / CAM machining & Rapid Prototyping
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Data Classification-Artworks
CAD/CAM technology is mainly used in the industrial, but with the
technology evolution , it has been able to assist with a combination of
traditional art and design techniques.
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Toy Design
Fine structural design,
form design, movable
joint design.
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Doll Design
Scan collectible doll
filing.
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Artifacts Collection
Using technology to
restore the damaged
artwork or copy art.
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Data Classification-Industrial Products
3D scanning can be used in the aerospace industry and its surrounding
parts production purposes, requirements of the aerospace parts to process
the related aerospace production, manufacturing, design, testing and other
projects.
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Mold Industry
Can quickly determine the
location
of
critical
dimensions.
Auto Industry
3D printing systems used
to develop prototypes and
design.
Technology Industry
The reverse engineering
tools into a 3D model, you
can quickly complete the
design.
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Video
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Q&A
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References
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機械工程概論-電腦整合技術應用，徐祥禎
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快速成型原理與分類，蘇嘉祥老師，南台科技大學
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逆向工程作業流程之實務應用-汽車後視鏡，賴俊利
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以逆向工程技術應用於風扇葉片模型之重建研究，吳永裕講師，
聖約翰科技大學。
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逆向工程於精密產品設計與檢測之應用，蔡佳憲工程師，寶源
科技股份有限公司。
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http://wenzelamerica.com/
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http://www.rat.com.tw/ 馬路科技顧問股份有限公司
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http://www.rapidtech.com.tw/cht/Reversed%20Engineering.html
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http://www.kingfree.com.tw/index.php君霟有限公司
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