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Edi Kulderknup, Argo Pandis
GEOMETRICAL DEVIATIONS MEASUREMENT UNCERTAINTY ESTIMATION USING RANDOM FUNCTION

Workpiece geometrical deviations have essential influence for quality of apparatus. Geometrical deviations of apparatus mechanical components have accuracy level better as 1 µm.
For apparatus mechanical parts are used widely limits for flatness, cylindricity and position. By measurements of them shall be taken account additionally factors like autocorrelation between measurement points and influence factors variation over measurement area. Last can be described as random function which gives ground for the model of measurement and uncertainty estimation.

Ryota Kudo, Kohei Okuda, Kenya Okita, Yusuke Tokuta, Shun Nakatani, Motohiro Nakano, Kazuya Yamamura, Katsuyoshi Endo
SELF-CALIBRATION FOR OPTICAL PATH LENGTH OF 3D NANOPROFILER CONSIDERING RANDOM ERROR

In 3D nanoprofiler we develop, the optical path length is the largest uncertainty factor. As a method for self-calibration of the optical path length, we propose a method of utilizing a known optical path length shift. Results of simulation considering the random error, the accuracy was found to be dependent on 3 parameters. Similar characteristics is confirmed by experiment. Optical path length has been determined by the order of under four digits.

Chu-Shik Kang, Jong-Ahn Kim, Jae Wan Kim, Jonghan Jin
AN OPTICAL CALIBRATION METHOD FOR A DOUBLE-SLIT INTERFEROMETER CAPABLE OF INSPECTING THICKNESS VARIATION OF MOVING GLASS PANELS

A double-slit interferometer capable of inspecting thickness variation of a moving glass panel with nanometric resolution, and its calibration method using a partly electrode-coated nematic liquid crystal cell are presented.

George Kaisarlis, Vassilis Gikas, Theodoros Xenakis, Dimosthenes Stathas, Christopher Provatidis
COMBINED USE OF TOTAL STATION AND ARTICULATED ARM COORDINATE MEASURING MACHINE ON LARGE SCALE METROLOGY APPLICATIONS

The potential use of an hybrid system that combines a Total Station and an Articulated Arm CMM by utilizing a commonly-used industrial accessory, the hidden point bar tool, is examined. The analysis is focused on the formulation of the mathematical model that allows the interconnection of the two systems, the development of a traceable methodology frame and the transformation of data in a common reference system. The approach is experimentally verified on a typical industrial large scale component that is manufactured on the premises of Hellenic Shipyards S.A.

Martin Dub, Ondřej Berka, František Starý, František Lopot, Martin Janda, Vojtěch Dynybyl
EXPERIMENTAL ANALYSIS OF POSITIONING THE TURBINE AND THE GEARBOX USING STRAIN GAUGE

In this work, the positioning the turbine and the gearbox has been investigated. The standard methods of position measurement were at the limit of measurability so the measurement of relative position of the turbine and the gearbox was based on the measurement of shaft deformation respectively shaft bending moment using standard 120 Ohm strain gauge.

Algimantas Barakauskas, Albinas Kasparaitis, Saulius Kausinis, Rimantas Barauskas, Aurimas Jakstas
ANALYSIS OF THERMAL DEFORMATIONS OF AN OPTICAL ANGULAR ENCODER

The paper describes the practical application of thermal error analysis for an absolute angular encoder. Finite element analysis and experimental investigations are carried out to examine the essence of thermal process and to demonstrate the existence and feasibility of the thermal modal analysis for improvement of the performance of an optical angular encoder.

Marcin Berta, Zbigniew Humienny
SOFTWARE TOOLS AND TRICKS USED TO DEVELOP APPLICATION THAT EXPLAINS GEOMETRICAL TOLERANCING CONCEPTS

The paper demonstrates a new concept of teaching and training geometrical tolerancing fundamental and advanced principles with usage of computer simulations, as well as animations at a very large extend. The general concept, along with some programming solutions employed to develop an application Geometrical Tolerancing are presented. The application contains definitions, illustrations, plain animations, cartoon sequences and exercises for self-tuition that explain the ISO GPS tolerance system.

Asli G. Bulutsuz, M. Emin Yurci, M. Numan Durakbaşa
INVESTIGATION CMM MEASUREMENT PARAMETERS EFFECT TO THE MEASUREMENT ERROR

High measurement accuracy with optimum measurement procedure is a significant requirement in advanced fields of interchangeable manufacturing and precision engineering. This study presents optimum parameter selection for lowest measurement error. Moreover a mathematical model was obtained to predict measurement error according to the selected measurement parameters. The proposed prognostic model provided a well-suited method and gave promising results in predicting measurement errors by monitoring the parameters such as optimum probed point numbers, probing speed, probe radius and measurement angle of probe.

Eric Helmecke, Matthias Fleßner, Andreas Gröschl, Andreas Staude, Tino Hausotte
NUMERICAL MEASUREMENT UNCERTAINTY DETERMINATION FOR COMPUTED TOMOGRAHPY IN DIMENSIONAL METROLOGY

In Computed Tomography (CT) in dimensional metrology, the numerous complex measurement process steps with various influences present a significant impact on the measurement results. For the determination of measurement uncertainty, it is therefore important to consider all of these influences. The paper discusses the possibilities of a promising approach, the numerical uncertainty determination for CT in dimensional metrology.

Adam Gąska, Ksenia Ostrowska, Wiktor Harmatys, Piotr Gąska, Maciej Gruza, Danuta Owczarek, Robert Kupiec, Kamila Gromczak, Jerzy Sładek
VIRTUAL CMM MODEL ADAPTED FOR USAGE IN INDUSTRIAL CONDITIONS

Due to the rigorous requirements for implementation of the virtual models of CMMs they are usually used in the renowned calibration laboratories. This paper presents the novel methodology of implementing the virtual CMM model that is capable of correct uncertainty determination for measurements done in less stable industrial conditions. The verification results were also presented under varying ambient conditions. They prove the correctness of proposed methodology.

Page 357 of 977 Results 3561 - 3570 of 9762