CMM touch trigger performance verification using a probe test apparatus

Miguel, Paulo Augusto Cauchick; King, T.; Abackerli, Alvaro José

doi:10.1590/s1678-58782003000200006

Cited by 10 publications

(4 citation statements)

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“…For vertical distance between the centers of the bore of the rollers 1 and 6 (d 6 ), Eqs. (19) and (20) were obtained for Assemblages 1 and 2, respectively.…”

Section: Evaluation Of the Measurement Uncertainty Associated With Thmentioning

confidence: 99%

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Traceability for measurements carried out on incremental step loading equipment

Júnior

Leal

Pires

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The incremental step loading technique has been widely used for material hydrogen embrittlement characterization. However, due to numerous error sources that can affect the measurement results and to the current lack of standardization, users are facing difficulties in the evaluation of measurement uncertainty as well as in the metrological performance evaluation of incremental step loading equipment. The paper deals with evaluation of the metrological performance of equipment used to characterize the susceptibility of materials to hydrogen embrittlement through use of incremental step loading technique. Additionally, a procedure is developed to estimate the measurement uncertainty associated with the results obtained during the test. Two equipment configurations were verified. The first one, with a load cell of 20 kN, was used for test specimens with nominal dimensions of 30 mm, 30 mm and 200 mm in width, thickness and length, respectively; and the second, with a 1 kN load cell was used for test specimens with nominal dimensions of 10 mm × 10 mm × 60 mm. Three measurands were evaluated in each assemblage (force applied on the specimen, equipment arm positioning angle and stress). Several metrological parameters were estimated (bias, accuracy, expanded uncertainty, repeatability, maximum error, hysteresis and nonlinearity). The effectiveness of the proposed procedure for uncertainty assessment was tested by calculation of the uncertainty associated with lower value for fast fracture strength. From the obtained results, it was concluded that the two equipment configurations had excellent metrological properties, in both the loading and unloading phases. It was shown that the proposed procedure can properly estimate the uncertainty associated with measurement on incremental step loading testing. Considering the widely use of the incremental step loading technique, the results here presented can be particularly useful for ensuring the traceability of results to the International System of Units required by the ISO 17025 standard.

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“…For vertical distance between the centers of the bore of the rollers 1 and 6 (d 6 ), Eqs. (19) and (20) were obtained for Assemblages 1 and 2, respectively.…”

Section: Evaluation Of the Measurement Uncertainty Associated With Thmentioning

confidence: 99%

“…In mechanical engineering, the repeatability associated with the CMM touch trigger probe was assessed by Cauchick Miguel et al [19] with a 95% confidence level. CMM software validation was performed by Greif et al [20], Wäldele et al [21] and Weckenmann and Heinrichowski [22].…”

Section: Introductionmentioning

confidence: 99%

Traceability for measurements carried out on incremental step loading equipment

Júnior

Leal

Pires

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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“…For the random error, a number of factors significantly affecting a CMM while measuring circular features have been identified by Feng [9]. Miguel and Cauchick [10] demonstrated a technique for evaluating CMM touch trigger probes using a motorised traversing table coupled with a laser interferometer. The authors demonstrated how the random error of the probe head varied with the indexing angle and the stylus length.…”

Section: -Errors Due To Thermal Effects (Internal or External)mentioning

confidence: 99%

Uncertainty due to experimental conditions in co-ordinate measuring machines

Lobato

Ferri

Faraway

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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Any measurement method of a physical quantity cannot provide an exact unequivocal result due to the infinite amount of information necessary to characterise fully both the physical quantity to be measured and the measuring process. A quantitative indication of the quality of a measurement result needs therefore to be given to enable its reliable use. Uncertainty is one such indication. Provision of incorrect uncertainty statements for measurements performed by a coordinate measuring machine (CMM) may leads to very serious economic implications. In this study, the uncertainty of CMM measurements is estimated by a single parameter accounting for both systematic and random errors. The effects that environmental conditions (temperature), discretionary setup parameters (probe extension, stylus length) and measuring plan decisions (number of points) have on uncertainty of measurements is then investigated. Interactions between such factors were also shown to be significant.

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“…In addition, similar experimental studies of probe error and compensation can be found. Shen et al describe a pre-travel model and a trigger force model for touch trigger probes to obtain the value of pre-travel and experimental validation [11]; P. A. Cauchick Miguel et al [12,13] report the error sources of probe performance [14,15] and the development of a test apparatus to be used for checking touch trigger probes, which uses a gauge block surface to contact the probe ball tip until the probe is triggered, at which point the coordinate position is displayed by laser.Mayer et al [16] proposes a 3D error correction model and an experimental method based on the use of a micrometer and a high magnification video camera. Li et al [17] proposes a compensation method for probe errors using a 3D error map based on the probe's mechanical model.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation and Compensation Method of Trigger Probes in Measurement Based on the Abbé Principle

Ren

Chen

2020

Sensors

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Trigger probes are widely used in precision manufacturing industries such as coordinate measuring machines (CMM) and high-end computer numerical control(CNC) machine tools for quality control. Their performance and accuracy often determine the measurement results and the quality of the product manufacturing. However, because there is no accurate measurement of the trigger force in different directions of the probe, and no special measuring device to calibrate the characteristic parameters of the probe in traditional measurement methods, it is impossible to exactly compensate for the measurement error caused by the trigger force of the probe in the measurement process. The accuracy of the measurement of the equipment can be improved by abiding by the Abbé principle. Thus, in order to better evaluate the performance parameters of the probe and realize the accurate compensation for its errors, this paper presents a method which can directly measure the performance parameters of the trigger probe based on the Abbé measurement principle, expounds the measurement principle, the establishment of the mathematical model, and the calibration system, and finishes with an experimental verification and measurement uncertainty analysis. The experimental results show that this method can obtain the exact calibration errors of the performance parameters of the trigger probe intuitively, realize the compensation for the errors of the probe in the measurement process, and effectively improve the measurement accuracy.

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CMM touch trigger performance verification using a probe test apparatus

Cited by 10 publications

References 0 publications

Traceability for measurements carried out on incremental step loading equipment

Traceability for measurements carried out on incremental step loading equipment

Uncertainty due to experimental conditions in co-ordinate measuring machines

Performance Evaluation and Compensation Method of Trigger Probes in Measurement Based on the Abbé Principle

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