A Comparison between 3D Scanning and CMM Dimensional Inspection of Small Size Gas Turbine

2015 ◽  
Vol 1128 ◽  
pp. 347-352
Author(s):  
Gheorghe Matache ◽  
Valeriu Dragan ◽  
Cristian Puscasu ◽  
Valeriu Vilag ◽  
Alexandru Paraschiv
Keyword(s):  
Gas Turbine ◽  
White Light ◽  
Coordinate Measuring Machine ◽  
3D Scanning ◽  
Cad Model ◽  
Dimensional Inspection ◽  
Scanning Method ◽  
Thin Walls ◽  
Sharp Edges ◽  
Measuring Machine

The paper presents a comparison between Coordinate Measuring Machine and 3D white light scanning technologies as applied to the dimensional inspection of turbo-machinery parts such as turbine blade. The results were compared with the CAD model and each other. The results indicate that, even both methods are enough accurate with a slightly better accuracy for CMM, the operational speed and the variety of scanable surfaces give significant advantages to the 3D scanning method when prototypes require dimensional inspection by an alternative rapid route especially when dealing with objects with thin walls or sharp edges.

Methodology for evaluate the form deviations for formula one nose car

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
Paul Bere ◽  
Calin Neamtu
Keyword(s):  
Composite Material ◽  
Laser Scanning ◽  
Coordinate Measuring Machine ◽  
3D Scanning ◽  
Cad Model ◽  
3D Laser Scanning ◽  
Formula One ◽  
Dimensional Deviation ◽  
Measuring Machine

AbstractThe paper presents a measuring strategy for a Formula One car using a Coordinate Measuring Machine (CMM) and a 3D laser scanning devices. The measurement procedures outlined the dimensional deviation of the CAD model and prototype made of composite material. The authors present two methods for the determination of symmetry for components of a Formula One car based on measuring and 3D scanning.

scholarly journals Linear Accuracy of Full-Arch Digital Models Using Four Different Scanning Methods: An In Vitro Study Using a Coordinate Measuring Machine

2020 ◽  
Vol 10 (8) ◽  
pp. 2741 ◽  
Author(s):  
Young Hyun Kim ◽  
Sang-Sun Han ◽  
Yoon Joo Choi ◽  
Chang-Woo Woo
Keyword(s):  
Coordinate Measuring Machine ◽  
In Vitro Study ◽  
Dental Arch ◽  
Accuracy Evaluation ◽  
Arch Model ◽  
Linear Measurements ◽  
Scanning Method ◽  
True Model ◽  
Measuring Machine

Improving the accuracy of the digital model is essential for the digitalization of the dental field. This study introduced a novel method of objective accuracy evaluation of digitized full dental arch model using coordinate measuring machine (CMM). To obtain a true linear measurement value using the CMM, 17 reference balls were attached to the typodont, and 12 measurements between balls on the X-(width), Y-(length), and Z-axes (height) were performed automatically. A rubber impression and a plaster cast replica of the typodont with balls were fabricated, and they were digitized with following methods: (a) true model intraoral scans; (b) impression cone-beam computed tomography (CBCT) scans; (c) cast CBCT scans; and (d) cast extraoral scans. Each scanning method was performed 20 times. Twelve linear measurements on the digitized models were automatically made using software. The one-sample t-test and one-way analysis of variance were used for measurement accuracy analysis. The cast extraoral scan was most accurate on X- and Y-axes, while impression CBCT was the most accurate on Z-axis. Over all axes, the intraoral scan resulted in the most deviation from the true model, and the reproducibility of each scan was also low. Extraoral scan shows high precision on width and length, and impression CBCT is advantageous for dental work where height factor is of importance.

scholarly journals Evaluation of a multi-sensor horizontal dual arm Coordinate Measuring Machine for automotive dimensional inspection

2014 ◽  
Vol 72 (9-12) ◽  
pp. 1665-1675 ◽  
Author(s):  
Glen A. Turley ◽  
Ercihan Kiraci ◽  
Alan Olifent ◽  
Alex Attridge ◽  
Manoj K. Tiwari ◽  
...  
Keyword(s):  
Coordinate Measuring Machine ◽  
Dimensional Inspection ◽  
Measuring Machine ◽  
Dual Arm

Observation of Shape and Dimensional Accuracy Changing of Parts in Time Intervals Manufactured by Additive Method Fused Deposition Modeling

2018 ◽  
Vol 919 ◽  
pp. 182-189
Author(s):  
Ivan Molnár ◽  
Róbert Hrušecký ◽  
Ladislav Morovič ◽  
Augustín Görög
Keyword(s):  
Fused Deposition Modeling ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Medical Applications ◽  
Cad Model ◽  
Time Intervals ◽  
Manufacturing Method ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Measuring Machine

This article deals with the observation of shape and dimensional accuracy of parts after manufacturing in certain time intervals. The parts was manufactured by additive manufacturing method Fused Deposition Modeling (FDM). The shape and chosen dimension changes due to material shrinkage was observed on materials, namely Polylactic Acid (PLA) and Polyethylene Terephthalate Glycol (PET-G). These materials rank among health-conscious and usable in some medical applications. The parts were measured by using coordinate measuring machine (CMM) in certain time intervals and the shape and chosen dimensions was compared with the reference computer aided designed (CAD) model.

A Novel Method for Measuring Polyethylene Hip Liner Wear Using a Coordinate Measuring Machine and a Dual Stylus Probe

2016 ◽  
Vol 10 (1) ◽  
Author(s):  
Benjamin P. Cunkelman ◽  
Byoungwook Jang ◽  
Douglas W. Van Citters ◽  
John P. Collier
Keyword(s):  
Data Analysis ◽  
Data Acquisition ◽  
Computer Aided Design ◽  
Ex Vivo ◽  
Coordinate Measuring Machine ◽  
Linear Wear ◽  
Cad Model ◽  
Sources Of Error ◽  
Novel Method ◽  
Measuring Machine

Ex vivo high-resolution measurement of highly crosslinked (HXL) polyethylene hip liner wear is necessary to characterize the in vivo performance of these polymers that exhibit increased wear resistance. Current studies focus on using a coordinate measuring machine (CMM) to acquire data representing the bearing surface(s) of HXL hip liners and use this data to determine linear and volumetric wear. However, these current techniques are subject to error in both data acquisition and data analysis. The purpose of this study was to identify these sources of error and present a novel method for HXL wear measurement that minimizes these contributions to error: our novel methods use a CMM to measure both the articular and backside surfaces of HXL hip liners for subsequent data analysis in Geomagic Control and matlab. Our method involves a vertical orientation of the hip liner to enable one CMM scan of both sides of the hip liner. This method minimizes identified sources of error and proves to be an effective approach for data acquisition of HXL hip liner wear. We also find that our data analysis technique of calculating changes in wall thicknesses is effective in accounting for errors associated with data analysis. Validation of this technique occurred via measurement of two never-implanted HXL hip liners of different sizes (28 mm and 32 mm). In comparing the 32 mm hip liner to its corresponding computer-aided design (CAD) model, we found that our data acquisition technique led to a 0.0019 mm discrepancy between the scanned liner and its CAD model in measured thickness at the pole. We calculated 0.0588 mm and 0.0800 of linear wear for the 28 mm and 32 mm hip liners, respectively, based on our data analysis algorithm. We hypothesize that these reported linear wear values of the never-implanted hip liners are due to machining tolerances of the hip liners themselves.

scholarly journals A RE-Based Double Measurement Method for Unknown Rotor Profile of Screw Compressor

2014 ◽  
Vol 6 ◽  
pp. 715710 ◽  
Author(s):  
Xiao-Gang Ji ◽  
Yan Yang ◽  
Jie Xue ◽  
Xue-Ming He
Keyword(s):  
Measurement Method ◽  
Coordinate Measuring Machine ◽  
Screw Compressor ◽  
Cad Model ◽  
3D Cad ◽  
Rotor Profile ◽  
Measuring Machine ◽  
Normal Vectors ◽  
Radius Compensation ◽  
Double Measurement

An accurate and efficient measurement for unknown rotor profile of screw compressor has been a nodus in the field of coordinate measuring machine (CMM) measurement because of its complexity of 3D helical surface, whose normal vectors vary with different measured points, while conventional 2D measuring methods have the inevitable radius compensation. If measured points and corresponding normal vectors are known, a 3D radius compensation then could be applied without a theoretical error. In this paper, a double-measurement method based on Reverse Engineering (RE) is proposed to solve this problem. The first measurement focused on constructing a 3D CAD model as accurate as possible. So, according to the structure characteristics of the unknown rotor, a reasonable WCS is established firstly. Then a DRCH method is presented to eliminate the outliers of measured points. Finally, an indirect method is presented to measure the screw pitch with projection and transformation of measured point sets. In second section, a 3D measurement is planned by DIMS language with setting measured points and corresponding normal vectors, which are calculated according to 3D CAD model constructed in first section. Final experimental analysis indicates that measuring accuracy with this double-measurement method is improved greatly.

Experimental Investigation of Wing Accuracy Quantification using Point Cloud and Surface Deviation

2021 ◽  
Vol 4 (2) ◽  
pp. 13-20
Author(s):  
Mehmood Ahmad ◽  
Sheharyar Nasir ◽  
Zia Ur Rahman ◽  
Shuaib Salamat ◽  
Umar Sajjad ◽  
...  
Keyword(s):  
Reverse Engineering ◽  
Data Acquisition ◽  
Laser Scanning ◽  
Coordinate Measuring Machine ◽  
Surface Generation ◽  
Free Form ◽  
Cad Model ◽  
3D Cad ◽  
Deviation Analysis ◽  
Measuring Machine

A rapidly advancing lean production industry demands quick manufacturing solutions with greater precision and accuracy. This paper proposes a framework for the accurate quantification of a die-casted wing using laser scanning and reverse engineering technique. In this technique, the wing upper and lower surfaces are scanned using a Coordinate Measuring Machine (CMM). This scanned data is then imported into CAD software to generate the surface using Free Form Reverse Engineering (FFRE). The model fitness test patronizes the curve fitting used for the surface generation. The generated surface and the original 3D CAD model are investigated using deviation analysis for inaccuracies originating due to manufacturing and data acquisition. The wing is further analyzed by the point data to 3D CAD model deviation analysis. The methodology adopted significantly minimizes the data acquisition and data processing error allowing deviation to be solely traced back to the manufacturing technique.

Evaluation of Mechanical Reliability of Silicon Nitride Vanes After Field Tests in an Industrial Gas Turbine

2002 ◽  
Author(s):  
H.-T. Lin ◽  
M. K. Ferber ◽  
W. Westphal ◽  
F. Macri
Keyword(s):  
Silicon Nitride ◽  
Gas Turbine ◽  
Field Tests ◽  
Coordinate Measuring Machine ◽  
Biaxial Test ◽  
Silica Layer ◽  
Secondary Phases ◽  
Surface Strength ◽  
Measuring Machine ◽  
Industrial Gas Turbine

This paper provides a review of recent studies undertaken to examine the mechanical and thermal stability of silicon nitride ceramic vanes with and without an oxide-based environmental barrier coating (EBC) after field tests in an industrial gas turbine. Two commercially available silicon nitride vanes (i.e., AS800 and SN282) were evaluated, where the AS800 vanes had an EBC and the SN282 vanes did not. The average temperature and pressure of gas impinging upon the vanes were approximately 1066°C and 8.9 atm, respectively. Both silicon nitride vanes were subjected to exposure time up to 1818h. Scanning electron microscopy was used to provide an insight into the changes in the microstructures of silicon nitrides and EBC arising from the environmental effects. The recession of the airfoils resulting from the volatilization of the normally protective silica layer, and /or EBC, was also measured using a coordinate measuring machine. The long-term chemical as well as structural stability of the secondary phases as well as EBC were characterized using x-ray diffraction. The surface strength of exposed airfoils was evaluated using a miniature biaxial test specimen, which was prepared by a diamond core drilling.

scholarly journals Development of a Method for Tool Wear Analysis Using 3D Scanning

2017 ◽  
Vol 24 (4) ◽  
pp. 739-757 ◽  
Author(s):  
Marek Hawryluk ◽  
Jacek Ziemba ◽  
Łukasz Dworzak
Keyword(s):  
Indirect Method ◽  
Hot Forging ◽  
3D Scanning ◽  
Cad Model ◽  
Direct Control ◽  
Scanning Method ◽  
Advantages And Disadvantages ◽  
Wear Analysis ◽  
Further Development ◽  
Important Measurement

AbstractThe paper deals with evaluation of a 3D scanning method elaborated by the authors, by applying it to the analysis of the wear of forging tools. The 3D scanning method in the first place consists in the application of scanning to the analysis of changes in geometry of a forging tool by way of comparing the images of a worn tool with a CAD model or an image of a new tool. The method was evaluated in the context of the important measurement problems resulting from the extreme conditions present during the industrial hot forging processes. The method was used to evaluate wear of tools with an increasing wear degree, which made it possible to determine the wear characteristics in a function of the number of produced forgings. The following stage was the use it for a direct control of the quality and geometry changes of forging tools (without their disassembly) by way of a direct measurement of the geometry of periodically collected forgings (indirect method based on forgings). The final part of the study points to the advantages and disadvantages of the elaborated method as well as the potential directions of its further development.

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