BS ISO 1328-2:2020 pdf free.Cylindrical gears – ISO system of flank tolerance classification.Definitions and allowable values of double flank radial composite deviations.
BS ISO 1328-2 This document establishes a gear tooth classification system relevant to double flank radial composite deviations of individual cylindrical involute gears and sector gears. It specifies the appropriate definitions of gear tooth deviations, the structure of the gear tooth flank classification system, and the allowable values of the gear tooth deviations. It provides formulae to calculate tolerances for individual product gears when mated in double flank contact with a master gear. Tolerance tables are not included.This document is applicable to gears with three or more teeth that have reference diameters of up to 600 mm.This document does not provide guidance on gear design nor does it recommend tolerances.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 701, International gear notation一Symbols for geometrical data ISO 1122-1, Vocabulary of gear terms一Part 1: Definitions related to geometry.For the purposes of this document, the terms and definitions given in ISO 701 and ISO 1122-1 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: 一ISO Online browsing platform: available at https://www.iso.org/obp 一IEC Electropedia: available at http://www.electropedia.org/ 3.1.1 double flank test test where a master gear (3.1.4) and a product gear (3.1.5) are rotated in tight mesh contact, i.e. held together by a spring load so there is no backlash, while measuring the changes in center distance 3.1.2 elemental deviation deviation, such as profile and helix deviation on individual teeth or pitch deviation between teeth,
generally using a single point of contact probe.With agreement between the purchaser and manufacturer, the tolerances may be applied to other types of gears such as cylindrical worms, worm gears, racks, and bevel gears. However, in these cases,modified procedures and associated measurement processes should be considered since this standard only describes procedures for parallel axis gears. See ISO/TR 10064-2 for additional information.BS ISO 1328-2 pdf download.