This document discusses 3D scanning technology used for reverse engineering applications at Moscow State University of Mechanical Engineering. The process involves using a 3D scanner to take 10 scans of an object from different angles, aligning and merging the scans using Geomagic Studio software, and validating the model by measuring dimensions. While the technology produces useful models, the process is not fully automated and involves many steps. The document recommends improving automation and accuracy by developing algorithms for automatic scan alignment and detection of low-quality scan data.

1. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
Student: Florian Knubben B.Sc.
Group/Institution: RWTH Aachen
Supervisor: Dr.-Ing. mult. Mikhail A. Petrov
Department «Machines and metal forming technologies»
named after I.A. Noritzin
3D scanning technology in reverse
engineering application
MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING

2. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
• field of study: Mechanical Engineering
• occupational field: Design Engineering
about me

3. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
• 240.000 citizen
• next to the tripoint with
netherlands and belgium
• main employer RWTH Aachen
Aachen

4. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
Aachen

5. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
• founded 1870
• over 40,000 students enrolled
• 130 study programs
• largest technical university in Germany
• best known for: mechanical engineering, electrical
engineering, medicine

6. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
main building central service building
built in 1870 built in 2008

7. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
Mechanical engineering at
• about 1.500 new mechanical engineering students
every year
• Bachelor takes 3,5 years
• Master takes 1,5 years
• average time for Bachelor and Master is 7 years

8. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
3D scanning at МАМИ
• Reverse engineering process
– important for reviewing quality of produced parts
– useful in bionics

9. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
• calibrate the cameras
• calibrate the table (rotating
axis)
• apply chalk to the object
• set up the program
• perform 10 scans in a 360°
rotation
Scanning process

10. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
Geomagic Studio
• import the scans
• delete unwanted surfaces (e.g.
table)
• merge 10 related scans (one
rotation) together
• merge all obtained scans
together
• fill holes
• create a solid body

11. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
validation of obtained scans
• subjective
– surface (roughness, details, …)
– overall shape
– all features replicated
• objective
– measure distances

12. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
comparing the dimensions
86,85 mm
87,4 mm

13. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
• relative inaccuracy around 0,5% (scan is to small)
• rough details were displayed correctly
• information loss in drills (threads) and small details
due to smoothing operations
quality of the scan

14. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
critical parameters during the scan
• camera focus
• closed aperature
• no overexposed
areas
• no interfering light
source
• accurate calibration
• beamer focus

15. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
sources of errors processing the data
• incorrect alignement, bad quality areas

16. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
conclusion
• 3D scanning produce a useful output
• not automated
• too much steps necessary

17. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
further steps
• Improve the automatization
– algorythm for automatical alignement of scans
• Improve the accuracy of the scans
– algorythm detecting bad quality of scanned data

18. MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING
Thank you for attention!
MOSCOW STATE UNIVERSITY
OF MECHANICAL ENGINEERING (MAMI)
UNIVERSITY OF MECHANICAL ENGINEERING