ASME B46.1:1995 pdf download SURFACE TEXTURE (SURFACE ROUGHNESS, WAVINESS, AND LAY)
1.1 General
1.1.1 Scope. This Standard is concerned with thegeometric irregularities of surfaces.It defines surfacetexture and its constituents: roughness, waviness, andlay. It also defines parameters for specifying surfacetexture.
The terms and ratings in this Standard relate tosurfaces produced by such means as abrading, cast-ing，coating，cutting，etching，plastic deformationsintering,wear, erosion, etc.
1.1.2 Limitations. This Standard is not concernedwith error of form and flaws, but discusses these twofactors to distinguish them from surface texture.This Standard is not concerned with luster, appearance， color, corrosion resistance， wear resistance hardness，subsurface microstructure，surfaceintegrity, and many other characteristics which maygovern functional considerations in specific applications.
This Section does not recommend specific surfaceroughness, waviness, or type of lay suitable for specific purposes,nor does it specify the means bywhich these irregularities may be obtained or produced. Criteria for selection of surface qualities andinformation on instrument techniques and methodsof producing,controlling, and inspecting surfaces areincluded in the other sections and in the appendices.The appendices shall not be considered a part of thisStandard. They are included for clarification and in-ormation purposes only.
Surface texture designations as delineated in thisStandard may not provide a sufficient set of indexesfor describing performance. Other characteristics ofengineering components such as dimensional and geometrical characteristics，material, metallurgy, andstress must also be controlled.
1.1.3 SI Values. Values of quantities stated in theSI’ (metric) system are to be regarded as standard Approximate nonmetric equivalents are shown forreference.
1.1.4 References. This Standard is to be used inconjunction with ASME Y14.36MSurface TextureSymbols,which prescribes engineering drawing andrelated documentation practices for specifying sur-face texture.Other relevant standards,which shouldbe used in design and measurement, are:
ASME B89.6.2-1973(R1988)，Temperature andHumidity Environment for Dimensional Measure-ment
ASME Y14.5M-1994，Dimensioning and Toler-ancing,Engineering Drawings and Related Docu-mentation Practices
The above standards are available from ASME OrderDepartment,22 Law Drive.Box 2300,Fairfield.NJ07007-2300.
References to other useful works are included asfootnotes.
1.1.5 Cleanliness. Normally, surfaces to be mea-sured should be free of any foreign material thatwould interfere with the measurement.
1.2 Definitions Related to Surfaces
1.2.1 Surfacessurface – the boundary that separates an objectfrom another object, substance, or spacenominal surface — the intended surface boundary(exclusive of any intended surface roughness)theshape and extent of which is usually shown and di-mensioned on a drawing or descriptive specification(See Fig.1-1.)
real surface – the actual boundary of an object.
1.2.2 Components of the Real Surface. The real surface differs from the nominal surface to the extent that it exhibits surface texture, flaws, and errors of form. It is considered as the linear superposition of roughness, waviness, and form with the addition of flaws.
ASME B46.1:1995 pdf download
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