Machinery's Handbook, 31st Edition
ISO FINISH STANDARDS 823 relationship to text height differs in each as well. There is now less harmonization between ANSI/ASME Y14.36 and ISO 1302 than has been the case previously. Table 1. Other ISO Standards Related to Surface Finish ISO 3274:1996 “Geometrical Product Specifications (GPS) — Surface texture: Profile method; Nominal characteristics of contact (stylus) instruments.” ISO 4287:1997 “Geometrical Product Specifications (GPS) — Surface texture: Profile method; Terms, definitions and surface texture parameters.” ISO 4288:1996 “Geometrical Product Specifications (GPS) — Surface texture: Profile method; Rules and procedures for the assessment of surface texture.” ISO 8785:1998 “Geometrical Product Specifications (GPS) — Surface imperfections — Terms, definitions and parameters.” ISO 12085:1996 “Geometrical Product Specifications (GPS) — Surface texture: Profile method — Motif parameters.”
“Geometrical Product Specifications (GPS) — Surface texture: Profile method; Surfaces having stratified functional properties Part 1: Filtering and general measurement conditions.” Part 2: Height characterization using the linear material ratio curve.” Part 3: Height characterization using the material probability curve.”
ISO 13565-1:1996 ISO 13565-2:1996 ISO 13565-3:1998
Table 2. ISO Surface Parameter Symbols ( ISO 4287:1997 )
Rp = max height profile Rv = max profile valley depth Rz* = max height of the profile Rc = mean height of the profile Rt = total height of the profile
R δ c = profile section height difference Ip = sampling length - primary profile lw = sampling length - waviness profile lr = sampling length - roughness profile ln = evaluation length Z(x) = ordinate value dZ / dX = local slope
Ra = arithmetic mean deviation of the profile Rq = root mean square deviation of the profile Rsk = skewness of the profile Rku = kurtosis of the profile RSm = mean width of the profile R D q = root mean square slope of the profile Rmr = material ration of the profile
Zp = profile peak height Zv = profile valley depth Zt = profile element height Xs = profile element width Ml = material length of the profile
Graphic Symbology Textural Descriptions.— New to this version of ISO 1302:2002 is the ability to add textual descriptions of the graphic symbology used on drawing. This gives specifications writers a consistent means to describe surface texture specification from within a body of text without having to add illustrations. See Fig. 1 for textual appli cation definitions, then Fig. 2- Fig. 6 for applications of this concept.
turned Rz 3.1
Rz 6
Ra 1.5
3
21±0.1
0.1
0.2AB
Fig. 2. Indication of Texture Require ment on a “Final” Workpiece, Reflecting a 3 mm Machining Allowance
Fig. 3. Surface Texture Indications Combined with Geometric Dimensioning and Tolerancing
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