ISO 21920-3:2021
Geometrical product specifications (GPS) — Surface texture: Profile — Part 3: Specification operators
This document specifies the complete specification operator for surface texture by profile methods.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Complete specification operator
4.1 Introduction
4.2 General
4.3 General default settings
4.4 Default settings based on the specification
4.4.1 General rules
4.4.2 Default settings based on Nic or Scn
4.4.3 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on the upper tolerance limit
4.4.4 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on bilateral tolerance limits
4.4.5 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on the lower tolerance limit
4.4.6 Default settings for Pt
5 Default attribute values for parameters from ISO 21920-2
5.1 General
5.2 Default attribute values for height parameters and spatial parameters
5.3 Default attribute values for material ratio functions and related parameters
5.4 Default attribute values for volume parameters
5.5 Default attribute values for feature parameters
6 Default units for parameters from ISO 21920-2
6.1 General
6.2 Height parameters
6.3 Spatial parameters
6.4 Hybrid parameters
6.5 Material ratio functions and related parameters
6.6 Volume parameters
6.7 Feature parameters
Annex A (informative) How to determine specification operators
Annex B (informative) Examples of the determination of default settings
Annex C (informative) Major changes from ISO 4288
Annex D (informative) Settings for profile surface texture evaluation in the absence of a specification
Annex E (informative) Overview of profile and areal standards in the GPS matrix model
Annex F (informative) Relation with the GPS matrix
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Complete specification operator
4.1 Introduction
4.2 General
4.3 General default settings
4.4 Default settings based on the specification
4.4.1 General rules
4.4.2 Default settings based on Nic or Scn
4.4.3 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on the upper tolerance limit
4.4.4 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on bilateral tolerance limits
4.4.5 Default settings for Ra, Rq, Rz, Rp, Rv, Rzx and Rt based on the lower tolerance limit
4.4.6 Default settings for Pt
5 Default attribute values for parameters from ISO 21920-2
5.1 General
5.2 Default attribute values for height parameters and spatial parameters
5.3 Default attribute values for material ratio functions and related parameters
5.4 Default attribute values for volume parameters
5.5 Default attribute values for feature parameters
6 Default units for parameters from ISO 21920-2
6.1 General
6.2 Height parameters
6.3 Spatial parameters
6.4 Hybrid parameters
6.5 Material ratio functions and related parameters
6.6 Volume parameters
6.7 Feature parameters
Annex A (informative) How to determine specification operators
Annex B (informative) Examples of the determination of default settings
Annex C (informative) Major changes from ISO 4288
Annex D (informative) Settings for profile surface texture evaluation in the absence of a specification
Annex E (informative) Overview of profile and areal standards in the GPS matrix model
Annex F (informative) Relation with the GPS matrix
Bibliography