Combination of a vision system and a coordinate measuring machine for rapid coordinate metrology

2002 ◽  
Author(s):  
Yufu Qu ◽  
Zhaobang Pu ◽  
Guodong Liu
Keyword(s):  
Vision System ◽  
Coordinate Measuring Machine ◽  
Coordinate Metrology ◽  
Measuring Machine

Computer-Aided Coordinate Metrology

1993 ◽  
Author(s):  
Hong-Tzong Yau ◽  
Chia-Hsiang Menq
Keyword(s):  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Computer Integrated Manufacturing ◽  
Integrated Manufacturing ◽  
Coordinate Metrology ◽  
Cad Cam ◽  
Measuring Machine ◽  
Three Dimensional Coordinate ◽  
Inspection Machine ◽  
Accuracy And Repeatability

Abstract Three-dimensional coordinate metrology has gained much attention in recent years. On one hand, the accuracy and repeatability of a coordinate measuring machine (CMM) are approaching the sub-micron level. On the other hand, there is hardly any part that exists of which the dimensions cannot be measured with a CMM. This paper presents the recent development and applications in three-dimensional coordinate metrology. The emphasis has been placed in the utilization of computers and integration with CAD/CAM systems. Three important technologies, namely, CAD-directed inspection, three-dimensional optimal match, and reverse engineering are presented and discussed. With computers and CAD/CAM support, three-dimensional coordinate metrology has become an active part of the computer-integrated manufacturing (CIM). Its versatility and high degree of automation have made the CMM a universal inspection machine for quality control of manufactured parts in computer integrated manufacturing.

The Use of a Machine Vision System in a Flexible Manufacturing Cell Incorporating an Automated Coordinate Measuring Machine

1993 ◽  
Vol 207 (3) ◽  
pp. 199-204 ◽  
Author(s):  
X J Wang ◽  
C Butler
Keyword(s):  
Machine Vision ◽  
Flexible Manufacturing ◽  
Computer Aided Design ◽  
Manufacturing System ◽  
Vision System ◽  
Coordinate Measuring Machine ◽  
Cad System ◽  
Measuring Machine ◽  
Processing Techniques ◽  
Aided Design

The aim of this paper is to present a practical approach to the solution of problems associated with using an automated coordinate measuring machine (CMM) in a flexible manufacturing system (FMS) environment. The approach described uses machine vision and image processing techniques to permit transformations of the coordinate systems. In order to achieve flexible inspection, the system can recognize different workpieces by a quick matching method. The actual measuring path for the workpiece is derived from the original measuring path templates to allow for a workpiece to be measured in an arbitrary orientation on the table of the CMM. The original measuring path can be generated off-line by self-teach programming or from a computer aided design (CAD) system. The generation of the actual measuring path of the CMM is not limited by the complexity of the original off-line measuring path.

Application of the sampling strategies in the inspection process

2017 ◽  
Vol 231 (4) ◽  
pp. 565-575 ◽  
Author(s):  
Syed Hammad Mian ◽  
Abdulrahman M Al-Ahmari
Keyword(s):  
Sample Size ◽  
Adaptive Sampling ◽  
Sampling Methods ◽  
Fundamental Problem ◽  
Coordinate Measuring Machine ◽  
Sampling Strategy ◽  
Point Distribution ◽  
Coordinate Metrology ◽  
Inspection Process ◽  
Measuring Machine

The selection of appropriate sample size and point distribution on the measuring surface has been a fundamental problem in the contemporary coordinate metrology. It is usually resolved by the users depending on their instinct or prior experience. As a result, inspection results have to be compromised between accuracy and measurement time. However, to deliver quality products in minimum time, effort, and cost, a reliable and an efficient sampling plan is mandatory. Although there have been a remarkable progress due to the development of various procedures for computing the sample size and selecting the appropriate point distribution, still users are inconversant with the characteristics and applications of the available sampling methods due to the absence of a proper review. Accordingly, a systematic review, giving insight into the various strategies available for the sample size and the point distribution, is presented. In this article, different algorithms and their application in the estimation of sample size and point distribution have been reviewed comprehensively. The classification of sampling methods and the importance of adaptive sampling have also been described. It has been concluded that the effectiveness of inspection process or the performance of coordinate measuring machine can be escalated through the application of a suitable sampling strategy. Therefore, the metrologists should either develop an effective method for defining sampling strategy or select the most suitable method from the available resources before carrying out the inspection process.

scholarly journals Analysis and Realization of Sampling Strategy in Coordinate Metrology

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Syed Hammad Mian ◽  
Abdulrahman Al-Ahmari ◽  
Hisham Alkhalefah
Keyword(s):  
Grid Point ◽  
Coordinate Measuring Machine ◽  
Sampling Strategy ◽  
Surface Characteristics ◽  
Optimization Techniques ◽  
Point Distribution ◽  
Solution Approach ◽  
Coordinate Metrology ◽  
Measuring Machine ◽  
Distribution Algorithms

The stringent customer demands and competitive market emphasize the importance of efficient and effective inspection in industrial metrology. Therefore, the implementation of an appropriate sampling strategy, i.e., the number of points and their distribution, has become very important in the inspection process using a coordinate measuring machine. Moreover, the quality of inspection results has frequently been influenced by sampling plan as well as workpiece size and surface characteristics. It has been an indispensable problem in the present-day measurement processes. Thus, this paper investigates various sample sizes and different point distribution algorithms that can be employed in the evaluation of form error. The effect of specimen size and surface quality on the sampling strategy has also been investigated. Furthermore, this work employs a fuzzy based Technique for Order Performance by Similarity to Ideal Solution approach to realize the best sampling strategy. The results have demonstrated the significance of robust optimization techniques as well as the importance of a suitable sampling strategy in coordinate metrology. This study has also established that Poisson point distribution achieved the best accuracy and the Grid point distribution had taken the least measurement time.

scholarly journals Recent developments on an interferometric multilateration measurement system for large volume coordinate metrology

2021 ◽  
Author(s):  
Eva Katharina Rafeld ◽  
Nils Koppert ◽  
Matthias Franke ◽  
Frank Keller ◽  
Daniel Heißelmann ◽  
...  
Keyword(s):  
Measurement System ◽  
Large Volume ◽  
Coordinate Measuring Machine ◽  
Mathematical Background ◽  
Large Complex ◽  
Complex Shapes ◽  
Coordinate Metrology ◽  
Recent Developments ◽  
Measuring Machine ◽  
Propagation Of Uncertainties

Abstract A mobile multilateration measurement system developed at the Physikalisch-Technische Bundesanstalt (PTB) around 2010 has been thoroughly investigated and refined to gain better performance with smaller uncertainties even when applied to the calibration of large complex workpieces. The mathematical background of multilateration and the propagation of uncertainties for the algorithms involved is explained in detail. Using the example of simple 1D and 2D measuring tasks, the influence of certain parameters characterizing the setup of the measurement system on the overall uncertainty is quantified. A strategy is developed to incorporate multi-stylus measurements which are often inevitable when workpieces feature complex shapes. The findings are verified on a large involute gear which is 2 m in diameter. All measurements are performed on PTB's large coordinate measuring machine with a working range of 5 m x 4 m x 2 m.

Integrating a Vision System With a Coordinate Measuring Machine to Automate the Datum Alignment Process

2005 ◽  
Author(s):  
Rajesh Subramanian ◽  
H. James de St. Germain ◽  
Samuel Drake
Keyword(s):  
Reference Frame ◽  
Vision System ◽  
Coordinate Measuring Machine ◽  
Inspection Time ◽  
Alignment Procedure ◽  
Machined Parts ◽  
Alignment Technique ◽  
Alignment Process ◽  
Measuring Machine ◽  
Part Fixturing

Inspection is an important stage in the manufacturing process of machined parts. Coordinate measuring machines (CMM) have become more automatic, programmable, and capable of fulfilling the growing demands of inspection. However, fixturing (datum alignment) of parts is still done manually, consuming valuable inspection time. In this paper, we describe an automated datum alignment technique which integrates a vision system with the CMM to avoid part fixturing. The rough position of the part is estimated through image analysis. This initial reference frame drives the CMM through an automatic datum alignment procedure, thereby automatically establishing the reference frame without the use of fixtures. This technique has been demonstrated for two and a half dimensional (2.5D) machined parts with well-defined features that exhibit a stable position on a flat table.

A coordinate measuring machine vision system

1999 ◽  
Vol 38 (3) ◽  
pp. 239-248 ◽  
Author(s):  
J.B. Liao ◽  
M.H. Wu ◽  
R.W. Baines
Keyword(s):  
Machine Vision ◽  
Vision System ◽  
Coordinate Measuring Machine ◽  
Machine Vision System ◽  
Measuring Machine

CMM Dynamic Properties of the Scanning Measurement of a 2D Profile

2015 ◽  
Vol 9 (5) ◽  
pp. 530-533 ◽  
Author(s):  
Adam Woźniak ◽  
◽  
Grzegorz Krajewski
Keyword(s):  
High Speed ◽  
Dynamic Properties ◽  
Data Gathering ◽  
Coordinate Measuring Machine ◽  
Inspection Time ◽  
Coordinate Metrology ◽  
High Speed Data ◽  
Dynamic Errors ◽  
Measuring Machine ◽  
Modern Manufacturing

Scanning probe CMMs have come to be considered the standard in coordinate metrology, not only because they provide high-quantity, high-speed data gathering but also because the scanning technology significantly decreases inspection time. Modern manufacturing, especially in today’s highly competitive economy, requires increasingly efficient measuring machines and processes because inspection machines have often become the bottlenecks in the entire manufacturing processes. More efficient coordinate metrology can mean faster measurement cycles with acceptable accuracies. However, increasing scanning speeds has also significantly increased errors. This article proposes a new method of investigating and identifying the principal components of CMM dynamic errors. The principle of the method is presented, and the validity of the method is experimentally confirmed on a bridge coordinate measuring machine.

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