Comparison on Computed Tomography using industrial items

In a comparison involving 27 laboratories from 8 countries, measurements on two common industrial items, a polymer part and a metal part, were carried out using X-ray Computed Tomography. All items were measured using coordinate measuring machines before and after circulation, with reference measurement uncertainties in the range 1.5-5.5 mu m, showing a good stability over the 6 months of the circulation. The comparison has shown that CT measurements on the industrial parts used lie in the range 6-53 mu m, with maximum values up to 158 mu m. (C) 2014 CIRP.