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1
Content available Method for predicting the accuracy of rotational elements measurements using the five-axis coordinate measuring system
Gaska P., Gruza M., Harmatys W., Gaska A., Sladek J.
Journal of Machine Engineering
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2018
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Vol. 18, No. 3
78--86
EN
The measurements of solids of revolution are one of the most common task in industrial practice. Therefore it is not surprising, that new solutions dedicated to improve accuracy and acceleration of measurements of rotational components are emerging. In this group, the new generation of articulating probing systems (with ability of continuous indexation) is worth mentioning. These probing devices combined with standard CMM forms the five-axis coordinate system. Such solution results in measurements acceleration and also improve measurement repeatability. Studies on this type of probing systems proved that their accuracy depends strongly on the angular orientation of probing system used during measurement. Therefore authors developed model that allows simulation of probing system errors for any orientation. This article describes an attempt to use the model to find the configuration of the probing system that would provide the highest accuracy for rotational elements measurements. The simulation results are compared to the real measurements of standard elements performed on five axis measuring system. Described prediction method could have a beneficial effect on improving the accuracy of measurements and, as a result, on reducing production costs by minimizing the risk of erroneous decision on the conformity of products with their geometric specifications.
2
Content available Determination of influence of the parameters connected with the stabilization of the position on the 5-axis manipulators’ operation accuracy
Gaska A., Harmatys W., Gruza M., Gaska P., Sladek J.
Journal of Machine Engineering
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2018
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Vol. 18, No. 2
54--63
EN
The 5-axis systems, especially those that use in their kinematic chain both prismatic joints and revolute kinematic pairs are gaining popularity in many scientific disciplines with manufacturing, metrology and robotics at the forefront. This is therefore important to undertake research aiming in identification of sources of inaccuracies in their functioning and investigation on possibility of eliminating or compensating them. A significant impact on 5-axis kinematic structures accuracy may be assigned to parameters associated with the stabilization of the machine position and angular position, such as position stabilization time, position overshoot and drift of positioning accuracy. These parameters are well described in ISO 9283 standard related to performance criteria and test methods for industrial robots. The methodology presented in this standard is adapted for testing the impact of mentioned parameters for functioning of 5-axis kinematic structures other than industrial robots, which mainly include five-axis coordinate measuring systems and machine tools. A series of experiments performed on five-axis coordinate measuring system is presented in this paper, their results are assessed in a quantitative manner and basing on them a general algorithm for assessing the significance of impact of position stabilization parameters on functioning of the manipulator is proposed.
3
Content available Assessment of the impact of probe head hysteresis on the accuracy of five-axis coordinate measuring systems
Gąska P., Gruza M., Gąska A., Harmatys W., Sładek J.
Advances in Science and Technology. Research Journal
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2017
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Vol. 11, no 3
277-282
EN
One of the factors affecting the accuracy of Coordinate Measuring Systems is hysteresis of a probe head. It is important especially in case of touch trigger probes and should be taken into account during the determination of probing strategy. In this article, the authors try to assess how this phenomenon affects the accuracy of five axis coordinate systems which utilize articulating probe head. Such systems allow to measure point coordinates using rotary movements of the head what introduces changes to the probing process. The experiments presented in this paper are based on multiple measurements of the reference elements such as gauge blocks and standard ring.
4
Content available Analysis of measured workpiece’s form errors influence on the accuracy of probe heads used on five-axis measuring systems
Harmatys W., Gąska A., Gruza M., Gąska P., Sładek J.
Advances in Science and Technology. Research Journal
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2017
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Vol. 11, no 4
305--310
EN
The five-axis measuring systems are one of the most modern inventions in coordinate measuring technique. They are capable of performing measurements using only the rotary pairs present in their kinematic structure. This possibility is very useful because it may cause significant reduction of total measurement time and costs. However, it was noted that high values of measured workpiece’s form errors may cause significant reduction of the accuracy of a five-axis measuring system. The investigation on the relation between these two parameters was conducted in this paper and possible reasons of decrease in measurement accuracy was discussed on the example of measurements of workpieces with form errors ranging from 0,5 to 1,7 millimetre.
5
Content available remote System prognozowania dokładności pomiaru z wykorzystaniem symulatora współrzędnościowej maszyny pomiarowej oraz jej wirtualnego modelu dokładności
Gąska A., Gruza M., Gąska P., Harmatys W., Sładek J.
Mechanik
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2016
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R. 89, nr 3
220--221
PL
Prezentowany system służy do oceny dokładności pomiarów, zanim zostaną one wykonane w rzeczywistym systemie pomiarowym. Głównym elementem systemu jest wirtualny model maszyny pomiarowej, umożliwiający wielokrotne przeprowadzanie symulacji pomiaru, a następnie – na podstawie jej wyników – ocenę dokładności symulowanego pomiaru.
EN
The system presented in the article is designed to assess the accuracy of the measurements before they are implemented on a real measurement system. The main component of the system is a virtual model of measuring machine. It allows to estimate the measurement uncertainty due to multiple simulation of measuring task.
6
Content available remote Model parametryczny wzorca do sprawdzania drukarek 3D metodą badania pracą
Harmatys W., Gruza M., Gąska P., Gąska A., Sładek J.
Mechanik
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2016
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R. 89, nr 5-6
472-473
PL
Przedstawiono propozycję wzorca, którego wydruk – po przeanalizowaniu jego jakości – stanowi podstawę do oceny dokładności wytwarzania z zastosowaniem drukarek 3D. Ze względu na dużą różnorodność rozmiarów drukarek 3D wymiary wzorca zostały sparametryzowane w zależności od długości podstawowych osi przestrzeni roboczej drukarki.
EN
This article presents the concept of a standard which could be used for assessment of 3D printers output accuracy. Due to large diversity of working ranges of different 3D printers, dimensions of the standard were related exclusively to the length dimensions of the main axes of machines.
7
Content available remote Analiza wpływu trybu pracy pięcioosiowego systemu współrzędnościowego na dokładność pomiaru
Gruza M., Gąska A., Gąska P., Harmatys W., Sładek J.
Mechanik
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2016
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R. 89, nr 11
1708--1709
PL
W artykule zaprezentowane są wyniki badania wpływu trybu pracy pięcioosiowego systemu współrzędnościowego na dokładność pomiaru. Procedura badawcza zakładała pomiar dwóch pierścieni wzorcowych o różnej średnicy w trzech trybach pomiaru: 2-osiowym wykorzystującym ruchy samej głowicy, 3-osiowym wykorzystującym tylko ruchy maszyny i 5-osiowym stanowiącym ich połączenie.
EN
In this paper authors try to assess the impact of the chosen working mode on accuracy of five-axis measuring system. The experiment consists of measurement of two reference rings of different diameters using three working modes: 2-axis mode – when measurements are performed using only head rotary movements; 3-axis mode – using only Coordinate Measuring Machine movements and 5-axis mode – the combination of previously mentioned modes.
8
Content available Estimation of measurement uncertainty with the use of uncertainty database calculated for optical coordinate measurements of basic geometry elements
Owczarek D., Ostrowska K., Harmatys W, Sładek J.
Advances in Science and Technology. Research Journal
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2015
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Vol. 9, nr 27
112--117
EN
The paper presents a method for estimating the uncertainty of optical coordinate measurement based on the use of information about the geometry and the size of measured object as well as information about the measurement system, i.e. maximum permissible error (MPE) of the machine, selection of a sensor, and also the required measurement accuracy, the number of operators, measurement strategy and external conditions contained in the developed uncertainty database. Estimation of uncertainty is done with the use of uncertainties of measurements of basic geometry elements determined by methods available in the Laboratory of Coordinate Metrology at Cracow University of Technology (LCM CUT) (multi-position, comparative and developed in the LCM CUT method dedicated for non-contact measurements) and then with the use of them to determine the uncertainty of a given measured object. Research presented in this paper are aimed at developing a complete database containing all information needed to estimate the measurement uncertainty of various objects, even of a very complex geometry based on previously performed measurements.
9
Content available Determination of temperature impact on cmm residual kinematic errors distribution
Harmatys W., Gąska P., Gąska A., Gruza M., Sładek J.
Advances in Science and Technology. Research Journal
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2015
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Vol. 9, nr 26
113–-117
EN
In case of coordinate machines that use CAA correction matrix, the issue of kine¬matic errors analysis may be based on the determination of residual error distribu¬tion. Temperature changes have an impact on CMM kinematic structure, which may cause the differences in the map of residual errors. As for today, the residual errors were analysed only for the reference temperature. No research was undertaken on the residual errors changes depending on the temperature variations. This paper presents the experiment aimed at residual errors analysis and resulting errors distributions for different temperatures.
10
Content available Analysis of z-axis kinematics influence on measurement result
Gruza M., Harmatys W, Gąska P., Gąska A., Sładek J.
Advances in Science and Technology. Research Journal
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2015
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Vol. 9, nr 26
109–-112
EN
CMMs accuracy depend on a number of factors. In spite of using various methods for CMM correction, the differences can be observed in the metrological capability be¬tween the areas in the measuring volume of CMM. Authors attempted to estimate the impact of one of potential CMM accuracy influencing factors, a CMM Z-axis position during measurement, on measurement result. This article presents performed experi¬ments and obtained results.
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