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ASME B46.1:1995 pdf download.SURFACE TEXTURE (SURFACE ROUGHNESS, WAVINESS, AND LAY).
ASME B46.1 is concerned with the geometric irregularities of surfaces. It defines surface texture and its constituents: roughness, waviness, and lay. ft also defines parameters for specifying surface texture.
The terms and ratings in this Standard relate to surfaces produced by such means as abrading, casting, Coating, cutting, etching, plastic deformation, sinlering, wear, erosion. etc.
1.1.2 Limitations. This Standard is not concerned with error of form and flaws, hut discusses these two factors to distinguish them from surface texture.
This Standard is not concerned with luster, appearance, color, corrosion resistance, wear resistance, hardness, subsurface microstructure, surface integrity, and many other characteristics which may govern functional considerations in spccific 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 instrument techniques and methods of producing, controlling, and inspecting surfaces are included in the other sections and in the appendices. 1’he appendices shall not be considered a pan of this Standard. They are included for clarification and information purposes only.
Surface texture designations as delineated in this Standard may not provide a sufficient set of indexes for describing performance. Other characteristics of engineering components such as dimensional and geometrical characteristics, material, metallurgy, and stress must also be controlled.
1.1.3 SI Values. Values of quantities stated in the SI’ (metric) system are to be regarded as standard.
Approximate nonmetric equivalents are shown for reference.
1.1.4 References. This Standard is to be used in conjunction with ASME Y 14.36M, Surface Texture Symbols, which prescribes engineering drawing and related documentation practices for specifying surface texture. Other relevant standards, which should be used in design and measurement, are:
ASME B89.6.2-1973 (R1988), Temperature and Humidity Environment for Dimensional Measurement
ASME Y14.5M-1994, Dimensioning and Toterancing, Engineering Drawings and Related Documentation Practices
The above standards are available from ASME Order Department, 22 Law Drive, Box 23(X), Fairfield, NJ 07(X)7-2300.
References to other useful works are included as footnotes.
1.1.5 Cleanliness. Normally, surfaces to be measured should be free of any foreign material that would interfere with the measurement.
1.2 Definitions Related to Surfaces
1.2.1 Surfaces
3wface — the boundary that separates an object from another object, substancc, or space
nominal surface — the intended surface boundary (exclusive of any intended surface roughness). the shape and extent of which is usually shown and dimensioned on a drawing or descriptive specification (See Fig. 1-i.)
real suiface — ihe actual boundary of an object. Its deviations from the nominal surface stem from the processes that produce the surface.ASME B46.1 pdf download.