The Effect of a Stylus Tip on Roundness Deviation with Different Roughness

Contact stylus profilometry is the leading surface texture measuring method in many manufacturing industries. For years it has been unmatched in terms of accuracy and reliability. Advancements in technology have led to the improvements in the profilometer design. A stylus can either have a built in skid or be skidless. In this study, the influence of skid on the measurement accuracy and repeatability was evaluated. Four different contact stylus profilometers were used to measure three standard roughness artifacts each. Every set of measurements consisted of 50 repetitions of the same profile, with the same parameters. Out of these profiles, five roughness parameters were calculated and were subjected to a statistical analysis. Relative errors of these parameters were also considered and presented individually for each roughness standard. Researchers found differences in the measurement results dispersion of various roughness parameters between the three roughness standards. The presented results of the measurements clearly indicated that there is a dispersion of the obtained values for the older type of contact stylus profilometer (P1, skid). The skidless portable devices, P2 and P3, have better measurement resolution, which results in a noticeably lower dispersion of measured values. A tabletop, stationary device utilizes a skidless measuring probe. It has both the best resolution and the highest rigidity, which results in the lowest dispersion of measured values. The lowest relative error of the Ra parameter was determined for the P2 device (9.2%) and the highest was determined for the P3 device (72.6%).

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“…Another form of interference includes high frequency vibrations, originating either form internal (e.g. stages) or external sources [44].…”

Section: Measurement Methods In Contact Stylus Profilometrymentioning

confidence: 99%

Differences in Roughness Parameter Values from Skid and Skidless Contact Stylus Profilometers

Grochalski¹,

Mendak²,

Jakubowicz³

et al. 2021

Adv. Sci. Technol. Res. J.

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“…CMMs are known for their accuracy and reliability in measurement of geometrical features [17][18][19]. However, much attention must be paid on the measurement strategy, because the CMM data-fitting algorithms have direct impact on the out-of-roundness measurement [20], as well as the number and distribution of probing points [21] or the stylus tip dimensions [22]. It was demonstrated that CMM measurement of cylindricity provided different results than that of radial method, and differences were attributed to larger uncertainty expressed by maximum permissible error MPEE, as well as to smaller number of sampling points [23].…”

Section: Measurement Of Sleeves and Pins Geometrymentioning

confidence: 99%

Measurement of The Cycloidal Drive Sleeves and Pins

Zaręba

Mazur

Olejarczyk

et al. 2021

mech

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In the paper, an issue of CMM measurement strategy of the sleeves and pins designed for wear tests in the cycloidal drive. The measurement strategy was proposed, based on initial out-of-roundness measurement in scanning mode. Proposed approach ensured that the pin was measured along its entire 40 mm length with only small area of fixation ca. 5 mm left out, and all probing points for cylindricity deviation assessment were collected in one fixation. It was demonstrated that the cylindricity and roundness measurement results based on 8, 16 and 48 probing points provided sufficient data for further wear analysis. In some cases, the circles calculated from 4 points gave additional insights allowing to accept the part that otherwise might be possibly rejected.

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“…However, Sensors 2022, 22, 7005 2 of 14 in a complex CMM system, component errors tend to overlap each other, and thus they determine the error vector for every single measurement point [10]. That is why the stylus tip has undoubtedly some impact on the results of the measurements [11]. Similarly, the determination of the contact point between the probe ball tip and the measured surface is very important for the accuracy of measurements [12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Planar Point Identification Accuracy in CMM Measurements

Mazur

Čepová

Szymański³

et al. 2022

Sensors

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The paper presents the results of the investigations on the direction-dependent accuracy of the point identification during contact probe measurements with a coordinate measuring machine (CMM). Considering the contact point identified by an orthogonal to the surface probe movement, the transformation of coordinates was made in order to calculate the displacement of the measured point. As a result, the positioning accuracy was estimated in three axes. The experiments demonstrated a strong dependence of the displacement on the declination angle. Moreover, it was found that the directional surface texture which provided different roughness in perpendicular directions, had an impact on the positioning accuracy.

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The Effect of a Stylus Tip on Roundness Deviation with Different Roughness

Cited by 4 publications

References 2 publications

Differences in Roughness Parameter Values from Skid and Skidless Contact Stylus Profilometers

Differences in Roughness Parameter Values from Skid and Skidless Contact Stylus Profilometers

Measurement of The Cycloidal Drive Sleeves and Pins

Analysis of the Planar Point Identification Accuracy in CMM Measurements

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