Paragraphs 11.10 and 11.11 New or revisedĭatum feature simulator” was replaced with “ true geometric counterpart”. The function of the dynamic profile is toĪllow form to be controlled independent of size. Profile tolerance zone modifier” is new, for use with profile tolerancing. Deletion of the symbols does not leave industry without a means to control coaxial or symmetrical features, but it does eliminate the confusion that surrounds these symbols and their misapplication.”ĭirection in which a tolerance or other requirement applies. “Two past practices, use of concentricity and use of symmetry have been eliminated because other characteristics provide more direct control of features and establish requirements that have a well-defined meaning. (phew!) Removed symbols:Ĭoncentricity, definition and symbol, has been removed The layout of standard has been revised as well – all sections have been renumbered but the order of information hasn’t changed. Figures have been updated to include model-based application of dimensions and tolerances. An addition of updated figures accounts for this volume increase. The new standard is much thicker than the previous – 328 pages, a whooping increase in size from 214. ASME has just released Y14.5-2018 Dimensioning and Tolerancing Standard.īelow is a highlight of handful of changes at first glance.
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