The development of manufacturing techniques and, in particular, increasing requirements on the accuracy of products, delineates new challenges for coordinate metrology. Currently used measuring systems are getting more accurate while measurement duration is decreasing. However, fast and precise estimation of measurement uncertainty, which is a measure of its accuracy, is still problematic. The so called Virtual Models of measuring machines are being developed in order to determine the uncertainty of a particular measurement task in quasi-real time. Such models typically consist of modules which are responsible for simulating a specific source of uncertainty. In the case of CMMs one of the most difficult tasks is to create a model which simulates errors arising from the operation of probing systems. In this paper authors describe such a model, which was developed in Laboratory of Coordinate Metrology in Cracow University of Technology, as well as an attempt to optimize its operation.
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