Evaluation Of CMM's Uncertainty By Using Excel

Lem , Zhi Xian (2012) Evaluation Of CMM's Uncertainty By Using Excel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Uncertainty evaluation for the Coordinate Measuring Machine (CMM) is not an easy task. Mostly, the evaluation of CMM measurement will be carried out by using the Guide to the expression of Uncertainty Measurement (GUM). However, the complicated equations involved in the evaluations are not easy to be memorised and calculated. This study is carried out to overcome the difficulties of the CMM measurement evaluation by applying the functions of Excel to build up an uncertainty evaluation tool. There are a number of sources that may contribute to the measurement errors and uncertainty. However, the factors that taking part in this styudy are stylus length, ball diameter and touch speed. In order to evaluate the uncertainty in CMM measurement, a probe calibration artefact which is a ceramic sphere was measured and the uncertainty of CMM measurements were evaluated by using the evaluation tool created. This uncertainty evaluation tool was created by using the application of Excel accordance with GUM. Finally, the results of evaluation uncertainty were validated by comparing with the previous researchs.

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