Estimation of Precision and Uncertainty of a Calibration Artefact for CMMS

Antunes, Sara; Vicente, Marta

doi:10.1142/9789812702647_0001

Cited by 2 publications

(2 citation statements)

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“…• Experimental measurement of gauge blocks: Different artefacts, user-defined parts or geometrical gauges can be used to calibrate and determine uncertainty in CMM [5,6]. • Simulations of the measurement process: The Monte Carlo Method is commonly used for simulating complex measurement processes.…”

Section: Uncertaintiesmentioning

confidence: 99%

The statistical gauge in geometrical verification

Maihle¹,

Linares

Sprauel

2009

Precision Engineering

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International audienceCurrently, most measurement and geometrical verification processes are based on the characterization of distances or angles between geometrical elements. In a previous paper, a method was developed for the verification of ISO specifications using the statistical information included in a set of points. This method is based on the development of measurement sequences and hence a sequence of geometrical constructions. The main problem in this verification process is to propagate uncertainties. With a correct expression of a virtual gauge, it is possible to avoid this propagation; indeed by using virtual gauge manipulation, initial best-fitted surfaces are never touched. The aim of this paper is to present a new approach using this statistical information to describe the measured part and develop a virtual gauge system for verification. This will be done in two parts. The first part will focus on the statistical modelling of the measured surface; the second part will describe a verification method based on a virtual, i.e. numerical, gauge

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Section: Uncertaintiesmentioning

confidence: 99%

The statistical gauge in geometrical verification

Maihle¹,

Linares

Sprauel

2009

Precision Engineering

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“…In [7], we have compared four different types of reference artefacts for local and relative calibrations of CMMs: the single sphere, the step gauge block, the ball plate and the hole bar (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

A New Artefact, Hexapod Based, for Local Calibration of Coordinate Measuring Machines

Vicente

2011

Arab J Sci Eng

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Coordinate measuring machines (CMMs) play a leading role in today's industry. As measuring devices, their calibration is an important issue. There are several methods and correspondent artefacts to achieve this goal. However, most methods demand expensive tools and specially skilled operators able to perform complex procedures. So, in order to obtain a reliable calibration method both cheap and easy to implement, we developed a new calibration procedure, grounded on the use of a new artefact, which can be seen as a simplification of the hexapod machine. This is a rigid artefact and the error measurement method is based on the comparison between its measured and real known geometries. The main idea behind this process is to regard the machine errors as hexapod movements. This artefact is the main tool of a new method to obtain the local errors of the CMM. The local calibration permits the determination of the transfer function characterizing the sensor displacement of the CMM. This local calibration consists essentially on the measurement of a rigid artefact having a known geometry, derived from the hexapod geometry, which allows us to determine the errors of displacement of the sensor of the CMM. In this paper, we describe the developed artefact as well as the referring mathematical models, which are obtained from the general equations that model hexapod's behaviour and we state how the error measurement is done. We also present some experimental results, achieved with an uncalibrated built prototype, for the local errors of a CMM Leitz PMM 866, describing in its very course the required procedure. We conclude that the results are compatible with the existing methods and artefacts.

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Estimation of Precision and Uncertainty of a Calibration Artefact for CMMS

Cited by 2 publications

References 1 publication

The statistical gauge in geometrical verification

The statistical gauge in geometrical verification

A New Artefact, Hexapod Based, for Local Calibration of Coordinate Measuring Machines

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