Selection of sampling points for accurate evaluation of flatness error using coordinate measuring machine

2008 ◽  
Vol 202 (1-3) ◽  
pp. 240-245 ◽  
Author(s):  
R. Raghunandan ◽  
P. Venkateswara Rao
Keyword(s):  
Coordinate Measuring Machine ◽  
Accurate Evaluation ◽  
Sampling Points ◽  
Measuring Machine ◽  
Flatness Error ◽  
Selection Of

Probe Path Planning for Flatness Measurement on Coordinate Measuring Machine Using Ant Colony Optimization

2021 ◽  
Vol 41 ◽  
pp. 85-91
Author(s):  
Gourav N. Ambewadkar ◽  
Sudarshan P. Gajre
Keyword(s):  
Ant Colony Optimization ◽  
Sampling Method ◽  
Sampling Methods ◽  
Travelling Salesman Problem ◽  
Coordinate Measuring Machine ◽  
Ant Colony ◽  
Travelling Salesman ◽  
Crucial Problem ◽  
Measuring Machine ◽  
Flatness Error

Optimization of a flatness error inspection activity on coordinate measuring machine (CMM) is a very crucial problem which demands minimization of a probe path for productive inspection. In the present work, the approach is explained to minimize the total probe travelling length and hence, the time of flatness inspection. Three sampling methods with eight sample sizes have been considered for this work. The ant colony optimization (ACO) algorithm based on travelling salesman problem (TSP) approach was developed in MATLAB environment to find the shortest probe paths. It was verified that the probe path depends on the sampling method used to measure the flatness. The sampling method giving the shortest probe path was selected as the best-suited method for a particular sample size. The results obtained by analyzing an illustrative example shows that the proposed approach is both effective and optimum.

scholarly journals Robust Estimation of Optimal Sample Size for CMM Measurements with Statistical Tolerance Limits

2018 ◽  
Vol 220 ◽  
pp. 04001 ◽  
Author(s):  
Petr Chelishchev ◽  
Aleksandr Popov ◽  
Knut Sørby
Keyword(s):  
Sample Size ◽  
Cross Sections ◽  
Coordinate Measuring Machine ◽  
Cylindrical Part ◽  
Tolerance Limits ◽  
Optimal Sample ◽  
Free Model ◽  
Measuring Machine ◽  
Statistical Tolerance ◽  
Selection Of

The paper proposes the kernel probability density function approach to estimate the distribution of measurements on a part which is measured in a coordinate measuring machine (CMM). The study is based on the experimental data derived from internal cylinder measurements. The distribution free model suggested by Wilks was used as a reference for the selection of the sample size. Three cross sections of a cylinder were measured regarding to this reference. The work defines the minimum required sample size for obtaining at least 0.95 proportion of radius variation for particular studied cylindrical part with 95% confidence level.

scholarly journals Application of 3D CAD in the Design of Inspection and Planning System of Intelligent Three-coordinate Measuring Machine

2020 ◽  
Vol 18 (S3) ◽  
pp. 141-152
Author(s):  
Jin Guang ◽  
Fan Li
Keyword(s):  
Information Integration ◽  
Coordinate Measuring Machine ◽  
Planning System ◽  
Sampling Point ◽  
Inspection Planning ◽  
Point Distribution ◽  
General Surface ◽  
Sampling Points ◽  
Measuring Machine ◽  
Specific Implementation

Computer aided inspection planning based on CAD coordinate measuring machine is the basic key technology, which occupies a very important position in the quality system. Nowadays, the research of integration technology has made a lot of achievements, but the research on information integration of system and system lags far behind the information integration of machining. How to use the part information and measurement-related knowledge provided by the product model to automatically generate optimal testing procedures and testing instructions for use is the basic task of the oriented intelligent system. This paper aims at the development of intelligent CMM inspection planning system based on 3D, from the overall analysis and design of the system to the extraction of detection geometric information, sampling planning, detection path planning and automatic generation of quack measurement program and other related key technologies will be studied. This paper briefly analyzes the relevant factors that determine the number of sampling points and summarizes the point requirements for the distribution of sampling points, and in view of the shortcomings and limitations of various methods of sampling point distribution on the general surface, a sampling strategy with adaptive step size is proposed, which solves the problem of sampling planning on the general surface. In the specific implementation of sampling planning, it is divided into two ways: edge-based and face-based geometric element measurement and sampling. Considering the requirements of distribution points, specific sampling algorithms are designed respectively, focusing on the analysis of the differences between edges and faces.

scholarly journals Selection of the Best Model of Distribution of Measurement Points in Contact Coordinate Measurements of Free-Form Surfaces of Products

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5346 ◽  
Author(s):  
Marek Magdziak
Keyword(s):  
Coordinate Measuring Machine ◽  
New Method ◽  
Free Form ◽  
Experimental Investigations ◽  
Accuracy Of Measurements ◽  
Measuring Machine ◽  
Coordinate Measurements ◽  
Free Form Surface ◽  
Free Form Surfaces ◽  
Selection Of

The article presents a new method for determining the distribution of measurement points, which can be used in the case of contact coordinate measurements of curvilinear surfaces of products. The developed method is based on multi-criteria decision analysis. In the case of the new method, the selection of the distribution of measurement points on free-form surfaces is carried out based on the analysis of five different criteria. The selection of the best model of the distribution of measurement points results from the accuracy of coordinate measurements, the time needed to complete measurement tasks, the number of measurement points, the accuracy of the substitute surface representing the measured free-form surface and the area where measurement points are located. The purpose of using the developed method of the distribution of measurement points is to increase the performance of coordinate measurements primarily by increasing the automation of strategy planning of measurements of curvilinear surfaces and improving the accuracy of measurements of free-form surfaces of products. The new method takes into account various aspects of coordinate measurements to determine the final model of the distribution of measurement points on measured surfaces of products, thereby increasing the probability of the proper determination (i.e., identifying the highest deviations of a product) of the location of measurement points on the surfaces of a measured object. The paper presents an example of the application of the created method, which concerns the selection of the best model of the distribution of measurement points on a selected free-form surface. This example is based on, among others, the results of experimental investigations, which were carried out by using the ACCURA II coordinate measuring machine equipped with the VAST XXT measuring probe and the Calypso measurement software. The results of investigations indicate a significant reduction in time of coordinate measurements of products when using the new method for determining the distribution of measurement points. However, shortening the time of coordinate measurements does not reduce their accuracy.

scholarly journals Flatness error of a plane in the hand operated Coordinate Measuring Machine

Mechanik ◽  
2016 ◽  
pp. 100-104 ◽  
Author(s):  
Ryszard Filipowski ◽  
Zbigniew Lechniak ◽  
Józef Zawora
Keyword(s):  
Coordinate Measuring Machine ◽  
Measuring Machine ◽  
Flatness Error
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