ISO 1328-2-2020 pdf download

ISO 1328-2-2020 pdf download.Cylindrical gears一ISO system of flank tolerance classification – Part 2: Definitions and allowable values of double flank radial composite deviations. 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 TSO/TR 10064-2. NOTE I Tolerances for a specified class are calculated according to the formulae in Clause 5. To aid in visualizing how the tolerances change with the number of gear teeth, graphs are provided in Annex A showing tolerance values for 3 tolerance classes. NOTE 2 There is no correlation or interrelation between the classes specified in this document and other parts or standards such as ISO 1328-1. This document uses a unique set of tolerance classes (i.e., R30 to RSO) to reinforce that no correlation to other elemental or radial composite standards exists (see Annex C). However, while there is no general correlation to other standards, for a specific gear it is possible to find a tolerance class or classes according to this document that will give similar tolerances to those that were originally specified for the gear, see Annvx.D. NOTE 3 The specific methods of measurement, documentation of the results, inspection frequency, and use of statistical methods are items that normally are mutually agreed upon between the manufacturer and the purchaser. 4.2 Gear tooth tolerance class In this document, the double flank radial composite tolerance class is determined by measurement of total radial composite deviation, Fld, and tooth-to-tooth radial composite deviation, ftd. A gear that is specified to a single ISO double flank radial composite tolerance class shall meet both individual tolerance requirements. In addition to the total and tooth-to-tooth tolerances, Annex B provides an optional specification for composite tolerance over a selected number of teeth, k. NOTE I Specifying a class or measurement criteria that require more precise tolerances than required by the application can unnecessarily increase the cost. NOTE 2 Double flank measurements, such as tight mesh center distance, can be...