Uncertainty of Measurement for Design Engineers

Paper presents simple software for evaluation of uncertainty for measurements carried out on CMMs. The input data are coefficients from MPEE formulae for CMM as well as metrological characteristic (type of dimension or geometrical deviation). The evaluated uncertainty enables the designer preliminary judgement if the available measuring equipment enables proper verification of the products (if the assumed tolerances are not too narrow comparing to possibilities in the range of product verification). Attention is brought to the fact that on up-to-date technical drawings, to achieve unambiguous interpretation, more often tolerances of position and tolerance of profile any surface are used. The operation of the EMU-CMMUncertaintyTM software is discussed. On a few examples of coordinate measurement models the software principle of work is explained and uncertainty budgets presented.