NIST logo

Publication Citation: The Estimation of Measurement Uncertainty of Small Circular Features Measured by CMMs

NIST Authors in Bold

Author(s): Steven D. Phillips; Bruce R. Borchardt; William T. Estler;
Title: The Estimation of Measurement Uncertainty of Small Circular Features Measured by CMMs
Published: February 01, 1995
Abstract: This paper examines the measurement uncertainty of small circular features as a function of the sampling strategy, i.e., the number and distribution of measurement points. Specifically, we examine measuring a circular feature using a three-point sampling strategy in which the angular distance between the points varies from widely spaces, 120 degrees, to closely grouped, a few degrees. Both theoretical and experimental results show that the measurement uncertainty is a strong function of the sampling strategy. The uncertainty is shown to vary by four orders of magnitude as a function of the angular distribution of the measurement points. A conceptual framework for theoretically estimating the measuring uncertainty is described and a good agreement with experiment is obtained when the measurements are consistent with the assumptions of the theoretical model.
Citation: NIST Interagency/Internal Report (NISTIR) - 5698
Pages: pp. 1 - 12
Research Areas: Metrology, Manufacturing