ASME B46.1-2009 pdf download.Surface Texture (Surface Roughness, Waviness, and Lay)
1 GENERAL In cases of disagreement regarding the interpretation ofsurface texture measurements, itis recommended that measurements with skidless stylus based instruments with Gaussian filtering be used as the basis for interpre- tation. The following keymeasurementparameters must be established for proper surface texture specification and measurement.
1-1 General 1-1.1 Scope. This Standard is concerned with the geometric irregularities of surfaces. It defines surface texture and its constituents: roughness, waviness, and lay. It also defines parameters for specifying surface texture. The terms and ratings in this Standard relate to sur- faces produced by such means as abrading, casting, coat- ing, cutting, etching, plastic deformation, sintering, wear, erosion, etc. 1-1.2 Limitations. This Standard is not concerned with error of form and flaws, but discusses these two factors to distinguish them from surface texture. This Standard is not concerned with luster, appear- ance, color, corrosion resistance, wear resistance, hard- ness, subsurface microstructure, surface integrity, and many other characteristics which may govern functional considerations in specific applications. This Section does not recommend specific surface roughness, waviness, or type of lay suitable for specific purposes, nor does it specify the means by which these irregularities may be obtained or produced. Criteria for selection of surface qualities and information on instru- ment techniques and methods of producing, controlling, and inspectingsurfaces are included inthe othersections and in the appendices. Surface texture designations as delineated in this Stan- dard may not provide a sufficient set of indexes for describing performance. Other characteristics of engi- neering components such as dimensional and geometri- cal characteristics, material, metallurgy, and stress must also be controlled. 1-1.3 SI Values. Values of quantities stated in the SI 1 (metric) system are to be regarded as standard. Approximate nonmetric equivalents are shown for reference.4 STYLUS FORCE The maximum static measuring force is determined by the radius of the stylus and is chosen to assure mini- mal damage to the surface and that constant contact is maintained with the surface. Specific recommendations for stylus force may be found in para. 3-3.5.2 of the ASME B46.1-2009 standard. 5 MEASUREMENT PARAMETERS Many surface finish height parameters are in use throughout the world. From the simplest specification of a single roughness parameter to multiple roughness and waviness parameter specifications of a given sur- face, product designers have many options for speci- fying surface texture in order to control surface function. Between these extremes, designers should consider the need to control roughness height (e.g., Ra or Rz), roughness heightconsistency (e.g., Rmax), and waviness height (e.g., Wt). Waviness is a secondary longer wave- length feature that is only of concern for particular sur- face functions and finishing processes. A complete description of the various texture parameters may be found in Section 1 of the B46.1-2009 standard.
1-1.4 References. Unless otherwise specified on the engineering drawing or other relevant documents, this Standard is to be used inconjunction with ISO 1302:2002, (GPS) — Indication of Surface Texture in Technical Product Documentation, that prescribes engineering drawing and other related documentation practices for specifying surface texture. Relevant standards that may be used in design and measurement are the following: ASME B89.6.2-1973 (R2003), Temperature and Humidity Environment for Dimensional Measurement ASME Y14.5M-1994 (R2004), Dimensioning and Tolerancing, Engineering Drawings and Related Documentation Practices Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 (www.asme.org) ISO 1302:2002, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product documentation Publisher: International Organization for Standardiza- tion (ISO), 1 ch. de la Voie-Creuse, Case Postale 56, CH-1211, Gene` ve 20, Switzerland/Suisse (www.iso.org) ASME B46.1, Table J-1 ofNonmandatory Appendix J is a partial list of specific industry standards that reference surface texture specifications. Users are encouraged to submit additional industry standards to be considered as references in future versions of ASME B46.1, Nonmandatory Appendix J. References to other useful works are included as footnotes.