ISO 1328-2:2020 pdf download

ISO 1328-2:2020 pdf download.Cylindrical gears — ISO system of flank tolerance classification
1 Scope
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.
2 Normative references
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 — Symbols for geometrical data
ISO 1122-1, Vocabulary of gear terms — Part 1: Definitions related to geometry
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 701 and ISO 1122-1 and the following apply.
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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
3.1.3 elemental method
method to measure elemental deviations (3.1.2)
Note 1 to entry: ISO 1328-1 describes elemental methods and deviations.
3.1.4 master gear
gear with the required precision that is designed to measure double flank radial composite deviation in a double flank contact test with a product gear (3.1.5)
3.1.5 product gear
gear that is being measured or evaluated
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. Some design and application considerations may warrant measurements or documentation not normally included in standard manufacturing processes. Specific requirements shall be stated in the contractual documents. Additional information on double flank testing is given in ISO/TR 10064-2.