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2 Archives of Foundry Engineering

2 2011

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Measurement of large-size casting geometry of the CMM

Gapiński B., Grzelka M., Marciniak L., Mądry Ł., Stachowiak T.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2

19-22

The aim of this paper is to present the geometric dimensions' control of large castings and moulds on coordinate measuring machines (CMMs). Precise measurements of large components are connected with many problems that arise from the vast mass and dimensions of the element. The bodies with a mass of several or even tens of tons require that the same metrological regime is restricted which is dedicated for small components measurement. That force the use of suitable measuring device, measurement conditions and the adequate preparation of the element. Quality requirements expressed as tolerances in absolute terms do not cause difficulties in measurement. With regard to the significant size of the workpiece, it is not as easy to measure dimensions as with control of small elements. The paper presents the Coordinate Measuring Machines used to control large-size items.

Accuracy of the photogrametric measuring system for large size elements

Grzelka M., Budzik G., Marciniak L., Gapiński B.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2 spec.

75--80

The aim of this paper is to present methods of estimating and guidelines for verifying the accuracy of optical photogrammetric measuring systems, using for measurement of large size elements. Measuring systems applied to measure workpieces of a large size which often reach more than 10000mm require use of appropriate standards. Those standards provided by the manufacturer of photogrammetric systems are certified and are inspected annually. To make sure that these systems work properly there was developed a special standard VDI / VDE 2634, "Optical 3D measuring systems. Imaging systems with point - by - point probing. " According to recommendations described in this standard research on accuracy of photogrametric measuring system was conducted using K class gauge blocks dedicated to calibrate and test accuracy of classic CMMs. The paper presents results of research of estimation the actual error of indication for size measurement MPEE for photogrammetric coordinate measuring system TRITOP.