High precision roundness: Euromet Project 533 final report

    Research output: Book/ReportReport


    An international comparison of geometrical roundness measurements using error separation has been arranged between five European laboratories. In order to test the error separation in high precision roundness measurements, a glass hemisphere with a low roundness error was used. Measurements were made in two directions: perpendicular to the axis of rotation and perpendicular to the spherical surface. The measured departure from roundness varied from 5.6 nm to 20 nm and the calculated En < 1. The reason for the big variation in values of departure from roundness is believed to be unstability of the artefact. However, by removing the 2nd harmonic component from the roundness curves, similar features in some details are seen when comparing originally differently shapes.
    Original languageEnglish
    Place of PublicationHelsinki
    PublisherCentre of Metrology and Accreditation (MIKES)
    Number of pages28
    ISBN (Print)952-5209-60-1
    Publication statusPublished - 2001
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesMIKES Julkaisu


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