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.

scholarly journals A Measurement Method of Microsphere with Dual Scanning Probes

2019 ◽  
Vol 9 (8) ◽  
pp. 1598 ◽  
Author(s):  
Fang ◽  
Huang ◽  
Xu ◽  
Cheng ◽  
Chen ◽  
...  
Keyword(s):  
Measurement Method ◽  
Coordinate Measuring Machine ◽  
Quartz Tuning Fork ◽  
Cross Sectional ◽  
Scanning Probes ◽  
Repeatability Error ◽  
Measurement Results ◽  
Size Standard ◽  
Measuring Machine ◽  
Tungsten Tip

The probe tip of a micro-coordinate Measuring Machine (micro-CMM) is a microsphere with a diameter of hundreds of microns, and its sphericity is generally controlled within tens to hundreds of nanometers. However, the accurate measurement of the microsphere morphology is difficult because of the small size and high precision requirement. In this study, a measurement method with two scanning probes is proposed to obtain dimensions including the diameter and sphericity of microsphere. A series of maximum cross-sectional profiles of the microsphere in different angular directions are scanned simultaneously and differently by the scanning probes. By integrating the data of these maximum profiles, the dimensions of the microsphere can be calculated. The scanning probe is fabricated by combining a quartz tuning fork and a tungsten tip, which have a fine vertical resolution at a sub-nano scale. A commercial ruby microsphere is measured with the proposed method. Experiments that involve the scanning of six section profiles are carried out to estimate the dimensions of the ruby microsphere. The repeatability error of one section profile is 15.1 nm, which indicates that the measurement system has favorable repeatability. The mainly errors in the measurement are eliminated. The measured diameter and roundness are all consistent with the size standard of the commercial microsphere. The measurement uncertainty is evaluated, and the measurement results show that the method can be used to measure the dimensions of microspheres effectively.

Calibrator for 2D Grid Plate Using Imaging Coordinate Measuring Machine with Laser Interferometers

2015 ◽  
Vol 9 (5) ◽  
pp. 541-545 ◽  
Author(s):  
Mariko Kajima ◽  
◽  
Tsukasa Watanabe ◽  
Makoto Abe ◽  
Toshiyuki Takatsuji
Keyword(s):  
Measurement Method ◽  
Laser Interferometer ◽  
Coordinate Measuring Machine ◽  
Calibration Procedure ◽  
Expanded Uncertainty ◽  
Geometrical Error ◽  
Grid Plate ◽  
Measuring Machine ◽  
Laser Interferometers

A calibrator for 2D grid plates have been developed. The calibrator was based on a commercial imaging coordinate measuring machine (imaging CMM). A laser interferometer for the calibration of the x-coordinate and two laser interferometers for the calibration of the y-coordinate were attached to the imaging CMM. By applying multistep measurement method for the calibration procedure, the geometrical error in the calibrator was reduced. The calibration of a precision 2D grid plate was demonstrated, and the expanded uncertainty was estimated to be 0.2 μm (k =2).

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.

Measurement Method for the Symmetry Error of Double Keyway in a Wheel Hub Bore

2010 ◽  
Vol 139-141 ◽  
pp. 2087-2092
Author(s):  
Xiao Ming Zhao ◽  
Yun Feng
Keyword(s):  
Measurement Method ◽  
Geometric Analysis ◽  
Coordinate Measuring Machine ◽  
Position Error ◽  
Minimum Condition ◽  
Engineering Practice ◽  
Error Evaluation ◽  
Measurement Principle ◽  
Measuring Machine ◽  
Error Formulas

In this paper, a new measurement method is presented, This method is to use a three-coordinate measuring machine (CMM) to test the symmetry error of double keyway in a wheel hub bore. According to the minimum condition criterion of form and position error evaluation, and making use of the minimum tolerance zone of position error evaluation, two symmetry error formulas of double keyway in a wheel hub bore are deduced by geometric analysis. The problems may be encountered when using the formulas in the practical application are discussed. These formulas solve the measurement principle problem of double keyway in the engineering practice. In the end an example is put forward to verify this method and the formulas.

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.

scholarly journals Precision Measurement Method of Laser Beams Based on Coordinate Measuring Machine

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 112736-112741
Author(s):  
Yupeng Li ◽  
Ya Zhao ◽  
Zhi Wang ◽  
Chao Fang ◽  
Wei Sha
Keyword(s):  
Precision Measurement ◽  
Measurement Method ◽  
Coordinate Measuring Machine ◽  
Laser Beams ◽  
Measuring Machine

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.

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.

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