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. 2016 Nov 18;16(11):1940.
doi: 10.3390/s16111940.

Virtual Distances Methodology as Verification Technique for AACMMs with a Capacitive Sensor Based Indexed Metrology Platform

Raquel Acero  1 , Jorge Santolaria  2 , Agustin Brau  3 , Marcos Pueo  4
Affiliations

Virtual Distances Methodology as Verification Technique for AACMMs with a Capacitive Sensor Based Indexed Metrology Platform

Raquel Acero et al. Sensors (Basel). .

Abstract

This paper presents a new verification procedure for articulated arm coordinate measuring machines (AACMMs) together with a capacitive sensor-based indexed metrology platform (IMP) based on the generation of virtual reference distances. The novelty of this procedure lays on the possibility of creating virtual points, virtual gauges and virtual distances through the indexed metrology platform's mathematical model taking as a reference the measurements of a ball bar gauge located in a fixed position of the instrument's working volume. The measurements are carried out with the AACMM assembled on the IMP from the six rotating positions of the platform. In this way, an unlimited number and types of reference distances could be created without the need of using a physical gauge, therefore optimizing the testing time, the number of gauge positions and the space needed in the calibration and verification procedures. Four evaluation methods are presented to assess the volumetric performance of the AACMM. The results obtained proved the suitability of the virtual distances methodology as an alternative procedure for verification of AACMMs using the indexed metrology platform.

Keywords: AACMM; indexed metrology platform; verification; virtual distance.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Faro Platinum coordinate reference system in the initial position according to D-H model.
Figure 2
Figure 2
Faro Platinum arm, upper platform and lower platform coordinate reference systems.
Figure 3
Figure 3
Distances between spheres centers in the gauge, position Diag45 upwards.
Figure 4
Figure 4
Virtual gauges (1–6).
Figure 5
Figure 5
Measured distance and virtual distance concept.
Figure 6
Figure 6
Evaluation method 1: virtual distance between virtual point in gauge 1 and equivalent virtual points in virtual gauges (2–6).
Figure 7
Figure 7
Evaluation method 2: virtual distance between virtual point in gauge 1 and their equivalent virtual points in consecutive gauges.
Figure 8
Figure 8
Evaluation method 3: crossed virtual distances between virtual gauge 1 and virtual gauges (2–6).
Figure 9
Figure 9
Evaluation method 4: virtual vertical, horizontal and diagonal distances in virtual mesh 1.
Figure 10
Figure 10
Distance error per virtual distance evaluated (evaluation method 4).
Figure 11
Figure 11
Mean distance error per virtual mesh.
See this image and copyright information in PMC

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