Probing-error compensation using 5 degree of freedom force/moment sensor for coordinate measuring machine

Cho, Nahm-Gyoo

doi:10.1088/0957-0233/24/9/095001

Cited by 8 publications

(7 citation statements)

References 16 publications

(23 reference statements)

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“…When measuring with a traditional trigger probe, there will be a time delay between the touch of the probe and the generation of the trigger signal which will cause the motion axis to move a certain distance (called a pretravel error) [14,15]. The pretravel error is composed of the displacement of the trigger mechanism and elastic deformation of the stylus.…”

Section: Influence Of Surface Slope On Uncertainty Of Cmmmentioning

confidence: 99%

Coordinate stitching measurement of highly steep freeform surfaces

Chen

Zhai

2020

Meas. Sci. Technol.

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A coordinate measuring machine (CMM) is widely used for surface measurement during milling and grinding of workpieces. However, the measurement uncertainty increases with the surface slope for highly steep freeform surfaces. In addition, local features sometimes exist on the surface out of the accessible space of the CMM. This study presents a coordinate measurement method based on stitching multiple subpatches. The complex freeform surface of a large slope is first divided into subpatches which are individually tilted and measured with smaller uncertainty due to reduced slopes. A global stitching algorithm is then proposed to compensate the motion error and stitch all the subpatches together simultaneously, based on configuration optimization to minimize the overlap inconsistency. The coordinate stitching measurement method is first validated through simulation, which shows that the motion error of the order of 0.05°/0.5 mm is tolerable for a highly steep surface. It is then experimentally verified using the stitching measurement of an optical spherical surface and a steep freeform surface. An ordinary multi-axis adjustment stage is suitable for subpatch repositioning because the stitching algorithm compensates the motion error to a level lower than the CMM uncertainty.

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Section: Influence Of Surface Slope On Uncertainty Of Cmmmentioning

confidence: 99%

Coordinate stitching measurement of highly steep freeform surfaces

Chen

Zhai

2020

Meas. Sci. Technol.

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“…Wang Z et al used NURBS curves to obtain the equation for the probe tip centre trajectory and fitted it to obtain the 3D normal vector [9]. Lee M et al used the 3D output of the force sensor in the probe as the normal vector for the probe radius correction [10]. Wozniak A et al applied a fuzzy logic algorithm and geometric criteria to select the most likely contact points on each successive arc [11].…”

Section: Introductionmentioning

confidence: 99%

Normal vector centering method for probe correction in cylindrical worm tooth profile measurement

Jie,

Hui,

Zhaoyao

et al. 2023

Eng. Res. Express

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The measurement results of cylindrical worms vary greatly under different probe tip diameters on the Gear Measurement Center (GMC). Considering toroidal enveloping cylindrical worm (ZC1 worm) as an instance, after analysing the worm grinding coordinate system, the probe correction method based on normal vector centering (NVC) is established. The theoretical coordinate values of the points on the normal equidistant line which is rotated into the axial section are used as the probe tip center trajectory. Experiments were carried out with probe tip diameters of 1.0mm, 1.5mm and 2.0mm for the worm tooth profile measurement on a GMC. Compared with the traditional method, the variation between the profile deviations results using the proposed method become smaller and the variation of “profile deviation, total” is reduced from 8.3μm to 0.5μm, the profile slope deviation variation is reduced from 8.6μm to 0.5μm. The proposed method in ZC1 worm tooth profile measurement can effectively reduce the variation between the measurement results under different probe tip diameters on GMC, and also the methodology can be applied on other kinds of cylindrical worms. The method has significance for other curved profiles measurement on coordinate measurements.

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“…Therefore, compensation in the 2D plane introduces extra deviation into the final results with traditional curve compensation methods [2,7,13,14]. Park et al, Lee and Cho, and Liang et al used the 3D output of the force sensor in the probe as the compensation vector [15][16][17]. Nevertheless, the research results of Rak and Woźniak [14] showed that the accuracy of radius compensation from the force sensor is 0.1 mm on the edge of the surface.…”

Section: Introductionmentioning

confidence: 99%

A novel 3D radius compensation method of probe stylus tip in the free-form surface profile curve scanning measurement

Wang

Zhang

Shen

et al. 2020

Meas. Sci. Technol.

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The normal vectors of the free-form surface profile curve are generally not in the same plane, even if the profile curve is generated from the interaction between a plane and a surface. If the 2D compensation vector is adopted to reduce the cosine error, the accuracy is limited because the normal direction of the curve plane is not considered. In this paper, a novel radius compensation method adopts the 3D compensation vector instead of the 2D compensation vector like most existing works. An approximating method is proposed to estimate the 3D compensation vector, which is composed of two parts. One is the projection of the 3D vector in the curve plane that is calculated by the normal vector of the non-uniform rational Bézier spline fit curve. The other is the normal vector of the curve plane passing the measuring point. In addition, the deviation between the workpiece and CAD model may degrade the accuracy of the radius compensation. Through theoretical analysis, the influence of the deviation cannot be ignored when the deviation is larger than 0.2 mm. By setting up this threshold, under various levels of torsion angles and deviations for the free-form surface, the results show that the compensation accuracy of the proposed method has a better performance than traditional 2D compensation methods, which decreases the maximum error from 70.8 to 2.6 µm.

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Probing-error compensation using 5 degree of freedom force/moment sensor for coordinate measuring machine

Cited by 8 publications

References 16 publications

Coordinate stitching measurement of highly steep freeform surfaces

Coordinate stitching measurement of highly steep freeform surfaces

Normal vector centering method for probe correction in cylindrical worm tooth profile measurement

A novel 3D radius compensation method of probe stylus tip in the free-form surface profile curve scanning measurement

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