scholarly journals The system of measurement accuracy prediction, based on Coordinate Measuring Machine simulator and its virtual model

Mechanik ◽  
2016 ◽  
pp. 220-221
Author(s):  
Adam Gąska ◽  
Maciej Gruza ◽  
Piotr Gąska ◽  
Wiktor Harmatys ◽  
Jerzy Sładek
Keyword(s):  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Virtual Model ◽  
Measuring Machine

scholarly journals Influence of measuring force on CMM accuracy

2018 ◽  
Vol 208 ◽  
pp. 03004
Author(s):  
Bin Wang
Keyword(s):  
Cross Sections ◽  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Point Of View ◽  
Signal Acquisition ◽  
Force Model ◽  
Thin Part ◽  
Measuring Machine ◽  
The Relationship ◽  
Measuring Force

The measuring accuracy of CMM (Coordinate Measuring Machine) is influenced by many factors, such as temperature, humidity, measuring force and method of signal acquisition. For thin parts, the influence of measuring force is especially obvious. In this paper, the relationship between measuring force and measurement accuracy is studied for a thin part with a U-shaped cross-section. By analyzing the structure of the probe and establishing the force model, the influencing factors of the accuracy of CMM are obtained, and the influence of the contact deformation and the bending deformation on the measurement accuracy is analyzed from the point of view of material mechanics. At the same time, the measurement accuracy of different measuring cross-sections is analyzed. Through the research of this paper, the relationship between measuring force and CMM is established, and an effective method to improve the accuracy of CMM is also found.

Articulated Arm Length Calibration for Cantilever Coordinate Measuring Machine

2013 ◽  
Vol 333-335 ◽  
pp. 77-80 ◽  
Author(s):  
Hong Lei Ran ◽  
Shu Gui Liu ◽  
Hai Tao Zhang
Keyword(s):  
Measurement Accuracy ◽  
Small Volume ◽  
Low Cost ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Measurement Range ◽  
Precision Error ◽  
Large Measurement ◽  
Measuring Machine ◽  
Error Calibration

Cantilever CMM(short for coordinate measuring machine) is non-orthogonal type one with large measurement range, small volume, light weight, low cost, but lower precision. Error calibration and compensation is an important way to improve the measurement accuracy. This paper presents a new calibration method for the length of articulated arm just using the square. Facility requirement is relatively low and it is easy to operate. Comparing with that measured by laser interferometer, this method has a relatively high accuracy, having a certain value in practical measurement.

Impact of warm-up period on optical coordinate measuring machine measurement accuracy

Measurement ◽  
2021 ◽  
Vol 172 ◽  
pp. 108913
Author(s):  
Wiktor Harmatys ◽  
Adam Gąska ◽  
Piotr Gąska ◽  
Maciej Gruza ◽  
Jerzy Sładek
Keyword(s):  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Warm Up ◽  
Measuring Machine

A Novel Method of Establishing “Datum Reference” for the Coaxiality Measurements Using the Multi-Section and Multi-Probe Gauges

2011 ◽  
Vol 317-319 ◽  
pp. 1759-1768 ◽  
Author(s):  
Lian Hu Xu ◽  
Yi Bao Yuan ◽  
Wei Ying Piao
Keyword(s):  
Mathematical Method ◽  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Measurement Results ◽  
Manufacturing Errors ◽  
High Measurement ◽  
Measurement Principle ◽  
Manufacturing Accuracy ◽  
Measuring Machine ◽  
Measurement Efficiency

The electronic or pneumatic multi-section and multi-probe gauges are widely used for diameter and coaxiality measurements due to their high measurement efficiency in workshops. However, their measurement accuracy is determined mainly by the manufacturing errors of the assembly coaxiality master, therefore, how to establish coaxiality measurement datum reference is the key technology. The physical coaxiality masters are expected to be the impossible "zero error datum reference". The higher manufacturing accuracy of the masters, the more expensive for their manufacturing costs. A novel mathematical method on the basis of error separation principle was proposed in order to separate the manufacturing errors of the master. The basic principle is that the eccentric error of the coaxiality master can be expressed as the first harmonic function and the ideal zero-error datum reference could be established by the mathematical method of two sampling operations in phase difference of 180° in coaxiality master for gauge initialization. This method can be called as "mathematical datum reference" for coaxiality measurement. Experimental results indicate that the coaxiality measurement results of the multi-section and multi-probe gauge by the novel mathematical method coincide with those of the three-coordinate measuring machine and the maximum difference of both is about 0.0014 mm. The new coaxiality measurement principle can separate the datum error of the coaxiality master theoretically and can improve the coaxiality measurement accuracy greatly with the common accuracy coaxiality master.

scholarly journals Accuracy of full-arch digitalization for partially edentulous jaws — a laboratory study on basis of coordinate-based data analysis

2022 ◽  
Author(s):  
Kontis Panagiotis ◽  
Güth Jan-Frederik ◽  
Keul Christine
Keyword(s):  
Coordinate Measuring Machine ◽  
Reference Object ◽  
Orthodontic Appliances ◽  
Virtual Model ◽  
Intraoral Scanner ◽  
Model Situation ◽  
Dental Model ◽  
Kolmogorov Smirnov ◽  
Measuring Machine ◽  
Edentulous Jaws

Abstract Objectives To compare the accuracy (trueness and precision) of direct digitization of four different dental gap situation with two IOS (intraoral scanner). Materials and methods Four partially edentulous polyurethane mandible models were used: (1) A (46, 45, 44 missing), (2) B (45, 44, 34, 35 missing), (3) C (42, 41, 31, 32 missing), and (4) D (full dentition). On each model, the same reference object was fixed between the second molars of both quadrants. A dataset (REF) of the reference object was generated by a coordinate measuring machine. Each model situation was scanned by (1) OMN (Cerec AC Omnicam) and (2) PRI (Cerec Primescan AC) (n = 30). Datasets of all 8 test groups (N = 240) were analyzed using inspection software to determine the linear aberrations in the X-, Y-, Z-axes and angular deviations. Mann–Whitney U and two-sample Kolmogorov–Smirnov tests were used to detect differences for trueness and precision. Results PRI revealed higher trueness and precision in most of the measured parameters ($${\overrightarrow{V}}_{E}$$ V → E  120.95 to 175.01 μm, $$\overrightarrow{V}_{E}$$ V → E (x) − 58.50 to − 9.40 μm, $$\overrightarrow{V}_{E}$$ V → E (z) − 70.35 to 63.50 μm), while OMN showed higher trueness for $$\overrightarrow{V}_{E}$$ V → E  (y) regardless of model situation (− 104.90 to 34.55 μm). Model D revealed the highest trueness and precision in most of the measured parameters regardless of IOS ($$\overrightarrow{V}_{E}$$ V → E  120.95 to 195.74 μm, $$\overrightarrow{V}_{E}$$ V → E (x) − 9.40 to 66.75 μm,$$\overrightarrow{V}_{E}$$ V → E (y) − 14.55 to 51.50 μm, $$\overrightarrow{V}_{E}$$ V → E (z) 63.50 to 120.75 μm). Conclusions PRI demonstrated higher accuracy in the X- and Z-axes, while OMN depicted higher trueness in the Y-axis. For PRI, Model A revealed the highest distortion, while for OMN, Model B produced the largest aberrations in most parameters. Clinical relevance Current results suggest that both investigated IOS are sufficiently accurate for the manufacturing of tooth-borne restorations and orthodontic appliances. However, both hardware specifications of IOS and the presence of edentulous gaps in the dental model have an influence on the accuracy of the virtual model dataset.

A Kinematic Model for Parallel-Joint Coordinate Measuring Machine

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Jie Li ◽  
Lian-Dong Yu ◽  
Jing-Qi Sun ◽  
Hao-Jie Xia
Keyword(s):  
Mathematical Modeling ◽  
Data Processing ◽  
Newton Method ◽  
Measurement Accuracy ◽  
Kinematic Model ◽  
Coordinate Measuring Machine ◽  
Experimental Results ◽  
Kinematic Modeling ◽  
Kinematic Parameters ◽  
Measuring Machine

The typical nonorthogonal coordinate measuring machine is the portable coordinate measuring machine (PCMM), which is widely applied in manufacturing. In order to improve the measurement accuracy of PCMM, structural designing, data processing, mathematical modeling, and identification of parameters of PCMM, which are essential for the measurement accuracy, should be taken into account during the machine development. In this paper, a kind of PCMM used for detecting the crucial dimension of automobile chassis has been studied and calibrated. The Denavit–Hartenberg (D–H) kinematic modeling method has often been used for modeling traditional robot, but the D–H error representation is ill-conditioned when it is applied to represent parallel joints. A modified four-parameter model combined with D–H model is put forward for this PCMM. Based on the kinematic model, Gauss–Newton method is applied for calibrating the kinematic parameters. The experimental results indicate the improvement of measuring accuracy and the effectiveness of the PCMM based on the proposed method.

scholarly journals Measurement Accuracy Assessment for Laser Triangulation 3D Scanning Machine

2020 ◽  
Vol 8 (6) ◽  
pp. 2789-2793
Keyword(s):  
Measurement Accuracy ◽  
Accuracy Assessment ◽  
Measurement Data ◽  
Coordinate Measuring Machine ◽  
3D Scanning ◽  
Laser Triangulation ◽  
Cnc Machine ◽  
3D Scanner ◽  
Calibration Block ◽  
Measuring Machine

Laser triangulation 3D scanning machine is one of many types of 3D scanning technologies that are currently available in the current market. It is mainly use to capture object profiles as well as for measurement. Therefore, the measurement accuracy of laser triangulation 3D scanner was assessed and presented in paper. Three solid aluminum calibration block with known dimensions were fabricated by using CNC machine and these samples were named based on its profiles which are round, square and complex. Besides the laser triangulation 3D scanning machine, two more measuring equipment which are Vernier caliper and coordinate measuring machine were used as benchmarks. Three profiles were chose for each calibration block samples that made up of 9 profiles that have been measured and the deviation between the measuring values were analyzed. The results shown that the lowest deviation values for most of the profiles are from coordinate measuring machine and Vernier caliper measurement data. Nevertheless, the measurement deviation for laser triangulation 3D scanner are found to be comparable with other equipment.

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