An Investigation of the Mechanical Filtering Effect of Tactile CMM in the Measurement of Additively Manufactured Parts

Shan Lou, Stephen S Brown, Wenjuan Sun, Wenhan Zeng, Xiangqian Jiang, Paul Scott

Research output: Contribution to journalArticle

Abstract

The high level of surface roughness of additively manufactured parts post challenges to the applicability of different dimensional measurement techniques, including tactile, optical and X-ray computed tomography. Tactile measurement is traditionally considered to have the best accuracy and traceability; however, its measurement can be significantly influenced by the mechanical filtering effect. This work investigates the influence of the mechanical filtering effect on tactile measurements of additively manufactured parts. Both experimental and simulation work are utilised to reveal this effect. Particularly the numerical simulation based on the morphological method allows a single influence factor e.g. the stylus diameter to be investigated. The maximum measurement errors caused by the stylus mechanical filtering effect are determined by the convex hull points of the measurement profile, which is equivalent to using an infinitely large stylus. Coordinate measuring machine and X-ray computed tomography measurement results of an additively manufactured test part’s cylinder diameters are compared, along with the application of morphological method to “compensate” the coordinate measuring machine’s mechanical filtering effect.
LanguageEnglish
Pages173-182
Number of pages10
JournalMeasurement: Journal of the International Measurement Confederation
Volume144
Early online date2 May 2019
DOIs
Publication statusE-pub ahead of print - 2 May 2019

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Coordinate measuring machines
Tomography
X rays
tomography
Measurement errors
dimensional measurement
Surface roughness
surface roughness
x rays
simulation
Computer simulation
profiles

Cite this

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abstract = "The high level of surface roughness of additively manufactured parts post challenges to the applicability of different dimensional measurement techniques, including tactile, optical and X-ray computed tomography. Tactile measurement is traditionally considered to have the best accuracy and traceability; however, its measurement can be significantly influenced by the mechanical filtering effect. This work investigates the influence of the mechanical filtering effect on tactile measurements of additively manufactured parts. Both experimental and simulation work are utilised to reveal this effect. Particularly the numerical simulation based on the morphological method allows a single influence factor e.g. the stylus diameter to be investigated. The maximum measurement errors caused by the stylus mechanical filtering effect are determined by the convex hull points of the measurement profile, which is equivalent to using an infinitely large stylus. Coordinate measuring machine and X-ray computed tomography measurement results of an additively manufactured test part’s cylinder diameters are compared, along with the application of morphological method to “compensate” the coordinate measuring machine’s mechanical filtering effect.",
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AU - Jiang, Xiangqian

AU - Scott, Paul

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