ISO 4288 pdf download.Geometrical Product Specifications (GPS) – Surface texture: Profile method – Rules and procedures for the assessment of surface texture
1 Scope
This International Standard specifies the rules for comparison of the measured values with the tolerance limits for surface texture parameters defined in IS0 4287, IS0 12085, IS0 13565-2 and IS0 13565-3. It also specifies the default rules for selection of cut- off wavelength, ilc, for measuring roughness profile parameters according to IS0 4287 by using stylus instruments according to IS0 3274.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1302:1992, Technical drawings – Method of indi- cating surface texture. IS0 3274: 1996, Geometrical Product Specifications W’S) – Surface texture: Profile method – Nominal characteristics of contact (stylus) instruments.IS0 4287: 1996, Geometrical Product Specifications GW – Surface texture: Profile method – Terms, definitions and parameters of surface texture. IS0 12085:1996, Geometrical Product Specifications WV – Surface texture: Profile method – Motif par- ame ters. IS0 13565-I :I 996, Geometrical Product Specifi- cations (G PS) – Surface texture: Profile method; sur- faces having stratified functional properties – Part I: Filtering and general measurement conditions. IS0 13565-2:1996, Geometrical Product Specifi- cations (G PS) – Surface texture: Profile method; sur- faces having stratified functional properties – Part 2: Height characterization using the linear material ratio curve. IS0 13565-3:- 1 1, Geometrical Product Specifications (GPS) – Surface texture: Profile method; surfaces having stratified functional properties – Part 3: Height characterization using the material probability curve. IS0 14253-1: – 11, Geometrical Product Specifications (GPS) – Inspection by measurement of workpieces and measuring instruments – Part 7: Decision rules for proving conformance or non-conformance with specifications.
3 Definitions
For the purposes of this International Standard, the definitions given in IS0 3274, IS0 4287, IS0 12085, IS0 13565-2 and IS0 13565-3 apply.
4 Parameter estimation
4.1 Parameters defined over the sampling length 4.1 .I Parameter estimate An estimate of the parameter’s value is calculated using the measured data from only one sampling length. 4.12. Average parameter estimate An average parameter estimate is calculated by taking the arithmetic mean of the parameter estimates from all the individual sampling lengths. When the standard number of five sampling lengths is used for roughness profile parameters, no suffix needs to be added to the symbol. For a parameter evaluated over a number of sampling lengths other than five, that number shall be added as a suffix to the parameter symbol (eg. &I, &3). 4.2 Parameters defined over the evaluation length For parameters defined over the evaluation length (Pt, Rt and wt), an estimate of a parameter’s value is calculated by using measurement data from an evaluation length equal to the standardized number of sampling lengths. 4.3 Curves and related parameters For curves and parameter’s val related parameters, an ue is calculated by using estimate of a measurement data from one curve, wh on the evaluati on length.
5 Rules for comparison of the measured values with the tolerance limits
5.1 Areas on the feature to be inspected The surface texture of the workpiece under inspection can appear homogeneous or be quite different over various areas. This can be seen by visual examination of the surface. In cases where the surface texture appears homogeneous, parameter values determined over the entire surface shall be used for comparison with the requirements specified on the drawings or in the technical product documentation. If there are separate areas with obviously different surface texture, the parameter values which are de- termined on each area shall be used separately for comparison with the requirements specified on the drawings or in the technical product documentation. For requirements specified by the upper limit of the parameter, those separate areas of the surface shall be used which appear to have the maximum par- ameter value.