scholarly journals Articulated Arm Coordinate Measuring Machine Calibration by Laser Tracker Multilateration

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jorge Santolaria ◽  
Ana C. Majarena ◽  
David Samper ◽  
Agustín Brau ◽  
Jesús Velázquez
Keyword(s):  
Coordinate Measuring Machine ◽  
Spatial Localization ◽  
Model Parameters ◽  
Nominal Data ◽  
Identification Procedure ◽  
Calibration Algorithm ◽  
Measuring Machine ◽  
Euclidean Distances ◽  
Machine Calibration ◽  
Nonlinear Optimization Algorithm

A new procedure for the calibration of an articulated arm coordinate measuring machine (AACMM) is presented in this paper. First, a self-calibration algorithm of four laser trackers (LTs) is developed. The spatial localization of a retroreflector target, placed in different positions within the workspace, is determined by means of a geometric multilateration system constructed from the four LTs. Next, a nonlinear optimization algorithm for the identification procedure of the AACMM is explained. An objective function based on Euclidean distances and standard deviations is developed. This function is obtained from the captured nominal data (given by the LTs used as a gauge instrument) and the data obtained by the AACMM and compares the measured and calculated coordinates of the target to obtain the identified model parameters that minimize this difference. Finally, results show that the procedure presented, using the measurements of the LTs as a gauge instrument, is very effective by improving the AACMM precision.

scholarly journals Study on Articulated type 3D Coordinate Measuring Machine : Calibration and accuracy estimation

2002 ◽  
Vol 2002 (0) ◽  
pp. 135-136
Author(s):  
Jyoji SEKI ◽  
Ryo YOKOYAMA ◽  
Nobuyuki FURUYA ◽  
Kazuhiro USUI ◽  
Norimasa KUROSAKI
Keyword(s):  
Coordinate Measuring Machine ◽  
Accuracy Estimation ◽  
Measuring Machine ◽  
Machine Calibration

scholarly journals An Angle Error Compensation Method Based on Harmonic Analysis for Integrated Joint Modules

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1715
Author(s):  
Yi Hu ◽  
Yuyi Zhan ◽  
Liang Han ◽  
Penghao Hu ◽  
Bing Ye ◽  
...  
Keyword(s):  
Harmonic Analysis ◽  
Coordinate Measuring Machine ◽  
Angle Measurement ◽  
Error Model ◽  
The Self ◽  
Model Parameters ◽  
Angle Error ◽  
Positioning Accuracy ◽  
Measuring Machine ◽  
High Repeatability

Nowadays, integrated joint modules are increasingly adopted in manipulators for their advantages of high integration, miniaturization and high repeatability positioning accuracy. The problem of generally low absolute positioning accuracy (namely angle measurement accuracy) must be solved before they can be introduced into the self-driven articulated arm coordinate measuring machine which is under study in our laboratory. In this study, the sources of joint module’s angle error were analyzed and the error model based on harmonic analysis was established. Two integrated joint modules were calibrated on the self-designed calibration platform and the model parameters were deduced, respectively. The angle error was then compensated in the experiments and the results demonstrated that the angle error of the joint modules was reduced by 82.03% on average. The established angle error model can be effectively applied into the self-driven articulated arm coordinated measuring machine.

scholarly journals Study on LT Accuracy Improvement by Calibration Based on Network Measurements

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7479
Author(s):  
Jesús Velázquez ◽  
Javier Conte ◽  
Ana Cristina Majarena ◽  
Jorge Santolaria
Keyword(s):  
Incidence Angle ◽  
Coordinate Measuring Machine ◽  
Calibration Procedure ◽  
Working Environment ◽  
Kinematic Parameters ◽  
Nominal Data ◽  
Network Measurements ◽  
Specialized Equipment ◽  
Measuring Machine ◽  
Error Parameter

Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. However, they require specialized equipment. A calibration procedure to improve the LT accuracy in an easy and fast way is presented in this paper. This method is based on network measurements where a set of reflectors were measured from different LT positions in a working environment. The methodology proposed deal with the lack of nominal data of the reflector mesh. A measurement scenario was defined, based on error parameter dependence on distances and angles, thus, obtaining those positions more sensitive to errors. The influence of the incidence angle of the laser beam on the reflector was characterized, revealing that its contribution to the LT measurement error can be up to 13 µm. Error kinematic parameters were identified to provide the optimum value of an objective function, where the reflector mesh nominal data were unknown. The calibration procedure was validated with nominal data, by measuring a set of reflectors located on a coordinate measuring machine. The findings of this study suggested that the LT accuracy can be improved up to 25%. Moreover, the method can be carried out by the LT user without requiring specialized equipment.

Study on Fast Calibration Model for Beam’s Space Position of Point-Structured Optical Probe

2015 ◽  
Vol 713-715 ◽  
pp. 406-410
Author(s):  
Jing Liang Liu ◽  
Yong Zhu ◽  
Zhen Ya Kang ◽  
Lei Wang
Keyword(s):  
Design Method ◽  
Object Oriented ◽  
Coordinate Measuring Machine ◽  
Optical Probe ◽  
Calibration Model ◽  
Object Oriented Design ◽  
Calibration Algorithm ◽  
Measuring Machine ◽  
Probe Calibration ◽  
Complex Mathematical Model

In this paper, calibration algorithm of point-structured laser’s beam space position can work in coordinate measuring machine (CMM) system by using the object-oriented design method with VS2010.And then, building complex mathematical model to achieve the auto-calibration process,so it can improve the efficiency and the repeatability of the probe calibration. The calibration experiments proved that the auto-calibration model was right.

scholarly journals Evaluation of dimensional accuracy of dental bridges manufactured with conventional casting technique and CAD/CAM system with Ceramill Sintron blocks using CMM

2018 ◽  
Vol 12 (4) ◽  
pp. 264-271 ◽  
Author(s):  
Alireza Izadi ◽  
Fariborz Vafaee ◽  
Arash Shishehian ◽  
Ghodratollah Roshanaei ◽  
Behzad Fathi Afkari
Keyword(s):  
Reference Model ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Three Dimensions ◽  
Casting Technique ◽  
Dimensional Changes ◽  
Conventional Casting ◽  
Cad Cam ◽  
Milling Method ◽  
Measuring Machine

Background. Recently, non-presintered chromium-cobalt (Cr-Co) blocks with the commercial name of Ceramill Sintron were introduced to the market. However, comprehensive studies on the dimensional accuracy and fit of multi-unit frameworks made of these blocks using the coordinate measuring machine (CMM) are lacking. This study aimed to assess and compare the dimensional changes and fit of conventional casting and milled frameworks using Ceramill Sintron. Methods. A metal model was designed and scanned and 5-unit frameworks were fabricated using two techniques: (I) the conventional casting method (n=20): the wax model was designed, milled in the CAD/CAM machine, flasked and invested; (II) the milling method using Ceramill Sintron blocks (n=20): the wax patterns of group 1 were used; Ceramill Sintron blocks were milled and sintered. Measurements were made on the original reference model and the fabricated frameworks using the CMM in all the three spatial dimensions, and dimensional changes were recorded in a checklist. Data were analyzed with descriptive statistics, and the two groups were compared using one-way ANOVA and Tukey test (α=0.05). Results. The fabricated frameworks in both groups showed significant dimensional changes in all the three dimensions. Comparison of dimensional changes between the two groups revealed no significant differences (P>0.05) except for transverse changes (arch) that were significantly greater in Ceramill Sintron frameworks (P<0.05). Conclusion. The two manufacturing processes were the same regarding dimensional changes and the magnitude of marginal gaps and both processes resulted in significant dimensional changes in frameworks. Ceramill Sintron frameworks showed significantly greater transverse changes than the conventional frameworks.

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