ISO 4156-3:2021 pdf download – Straight cylindrical involute splines — Metric module, side fit — Part 3: Inspection.
1 Scope This document provides data, guidance and requirements for the inspection of straight (non-helical) side fitting cylindrical involute splines. Limiting dimensions, tolerances, manufacturing deviations and their effects on the fit between connecting coaxial spline elements are defined and tabulated. Linear dimensions are expressed in millimetres and angular dimensions in degrees. 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 3, Preferred numbers — Series of preferred numbers ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out ISO 1938-1, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1: Plain limit gauges of linear size ISO 4156-1, Straight cylindrical involute splines — Metric module, side fit — Part 1: Generalities ISO 4156-2, Straight cylindrical involute splines — Metric module, side fit — Part 2: Dimensions ISO 5459, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 4156-1 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso .org/obp — IEC Electropedia: available at http://www.electropedia .org/ 4 Symbols and abbreviated terms NOTE Some of the symbols used can have a meaning other than the one intended here. The symbols H, Z, Y and W are common for gauge tolerances in other ISO standards and can seem to conflict with symbols used in this document. However, it was not thought necessary to distinguish between them, since the context will always preclude any ambiguity.
7.1.3.5 Variable sector gauge The variable sector gauge measures the actual circular tooth thickness or space width. The actual measurement is achieved using radially locking left- and right-hand flanks and comparison to a master having a known tooth thickness or space width. 7.1.4 Effective size 7.1.4.1 GO composite gauge GO composite gauges are used to check a) that the specified effective limits of tooth thickness or space width are not exceeded at the maximum material condition of the part, b) the specified form diameter of the part, thus ensuring that the required tolerances are controlled for the full involute depth, and c) the specified length of engagement, thus ensuring that the spline maximum material limit has not been exceeded. 7.1.4.2 Variable composite gauge The variable composite gauge measures the effective size of tooth thickness or space width. The actual measurement is achieved using the radially locking left- and right-hand flanks and comparison to a master having a known tooth thickness or space width. 7.1.4.3 NO GO composite gauge The NO GO composite gauge is used to check the specified effective limit of minimum tooth thickness or maximum space width, where the gauge contacts only at the ends.
ISO 4156-3:2021 pdf download – Straight cylindrical involute splines — Metric module, side fit — Part 3: Inspection
