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SR20 Metrologia |
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Title:
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APPLICATION OF TAGUCHI DESIGN OF EXPERIMENTS TECHNIQUES TO ESTIMATE COORDINATE MEASURING MACHINE UNCERTAINTY
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Summary :
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THE MODERN CONCEPT OF MEASUREMENT TRACEABILITY INVOLVES THE USE OF CALIBRATED GAUGES AND THE EXPRESSION OF THE MEASUREMENT UNCERTAINTY. IN THE CASE OF COORDINATE MEASURING MACHINES (CMM), THERE IS CONTROVERSY RELATED TO THE MOST SUITABLE METHOD TO DETERMINE THE MEASUREMENT UNCERTAINTY, DUE TO THE GREAT NUMBER OF VARIABLES AFFECTING THE MEASUREMENT ERRORS. THIS WORK PRESENTS A TECHNIQUE TO DETERMINE THE MEASUREMENT UNCERTAINTY OF CMM USING TAGUCHI DESIGN OF EXPERIMENTS. THESE TECHNIQUES ALLOW US TO PLAN EXPERIMENTS WHERE ONLY A FEW RUNS ARE EXECUTED TO INVESTIGATE A GREATER NUMBER OF VARIABLES. FIVE VARIABLES WERE STUDIED IN A MOVING BRIDGE CMM WHEN MEASURING A CALIBRATED BALL BAR GAUGE. THE STANDARD UNCERTAINTY WAS ESTIMATED BY THE STANDARD DEVIATION OF THE MEASUREMENT ERRORS AND ESTIMATES OF THE STANDARD UNCERTAINTY ASSOCIATED TO THE MACHINE VARIABLES WERE OBTAINED THROUGH THE COMPONENTS OF VARIANCE, DETERMINED WITH THE ANALYSIS OF VARIANCE RESULTS. THE RESULTS SHOWED THAT THE METHOD IS SUITABLE TO ESTIMATE THE MEASUREMENT UNCERTAINTY OF COMPLEX MEASUREMENT SYSTEMS WHEN THE MOST SIGNIFICANT UNCERTAINTY SOURCES ARE OF THE TYPE A.
KEY-WORDS: UNCERTAINTY ANALYSIS, TAGUCHI METHODS, COORDINATE MEASURING MACHINE |
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Author :
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Di Giacomo, Benedito 0
Piratelli Filho, Antonio 0
Zirondi, Renata Belluzzo
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Paper View :
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