ASME Y14.36 pdf free download

ASME Y14.36 pdf free download Surface Texture Symbols Engineering Product Definition and Related Documentation Practices
The subscript numbered letters in Figure 4-2 show the location ofadditional surface characteristics thatapply to the surface. When more surface characteristics are required, the horizontal line of the surface texture symbol may be raised and the long leg may be lengthened to provide more vertical space.
4.4.1 Lay Symbols. Symbols for designating the direc- tion of lay (surface marks) are shown in Figure 4-3. See Figure A-2 for symbol proportions.
4.4.2 Parallel. In the orthographic view, the lay is approximately parallel to the line representing the surface to which the surface texture symbol is applied. See Figure 4-3, illustration (a).
4.4.3 Perpendicular. In the orthographic view, the lay is approximately perpendicular to the line representing the surface to which the surface texture symbol is applied. See Figure 4-3, illustration (b).
4.4.4 Angular. The lay is angular in both directions to the surface to which the symbol is applied. See Figure 4-3, illustration (c).
4.4.5 Multidirectional. The lay is multidirectional rel- ative to the surface to which the symbol is applied. See Figure 4-3, illustration (d).
4.4.6 Circular. The lay is approximately circular rela- tive to the surface to which the symbol is applied. See Figure 4-3, illustration (e). 4.4.7 Radial.Thelayis approximatelyradialrelativeto the surface to which the symbol is applied. See Figure 4-3, illustration (f).
4.4.8 Particulate. The lay is nondirectional or protu- berant (cast surface). See Figure 4-3, illustration (g).
4.5 Symbol Placement The vertex of the symbol’s angled legs shall be placed (a) on a line representing the surface (b) on an extension line of the surface (c) attached to the horizontal portion of a leader line directed to the surface, or (d) attached to a feature control frame directed to the surface The symbol may be specified with a diameter dimen- sion. When the basic surface texture symbol is used, with or without MRR, NMR, or APA, it may be applied at any angle. When the expanded surface texture symbol is used, the parameter information shall be read from the bottom of the drawing graphic sheet (see Figure 4-4).
4.6 Textual Presentation of Surface Texture Requirements When surface texture requirements are presented as a textual entry, the standard display method illustrated in Figure 4-5 shall be used. The letters relate to the surface textureparameters(seepara.4.5 andFigures4-2 and4-5). The lay symbol abbreviations used in the textual presen- tation are as shown in ASME Y14.38. Use “MULTD” for the multidirectional lay abbreviation.
4.6.1 Sequence Format. The text positions for data entry sequence shall be in the order shown in Figure 4-2. Twoforwardslashes areusedto divideseparatepara- meter sequences after item “d.” 5 APPLICATIONS AND ASSOCIATED VALUES 5.1 Applicability of Controls When a surface texture symbol is used, it relates to the entiresurfaceorareatowhichitisapplied.Surfacetexture requirements comprised ofeither symbols or the textual presentation method maybe applied bythe use ofgeneral notes, contained in a title block, or defined in other speci- fications. Surfaces that require different parameters than thosestatedinthetitleblockorotherspecificationshallbe identifiedinthefieldofthedrawingwiththeirownsurface texture symbols and requirements. Only those items or values necessary to specify and verify the required surface texture characteristics shall be included (see Figure 4-4). See ASME B46.1 for default values.