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  2. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    Surface roughness can be regarded as the quality of a surface of not being smooth and it is hence linked to human perception of the surface texture. From a mathematical perspective it is related to the spatial variability structure of surfaces, and inherently it is a multiscale property.

  3. Surface imperfections (optics) - Wikipedia

    en.wikipedia.org/wiki/Surface_imperfections_(optics)

    These imperfections are part of the surface and cannot be removed by cleaning. Surface quality is characterized either by the American military standard notation (eg "60-40") or by specifying RMS (root mean square) roughness (eg "0.3 nm RMS"). [1] American notation focuses on how visible surface defects are, and is a "cosmetic" specification.

  4. Surface finish - Wikipedia

    en.wikipedia.org/wiki/Surface_finish

    Surface finish, also known as surface texture or surface topography, is the nature of a surface as defined by the three characteristics of lay, surface roughness, and waviness. [1] It comprises the small, local deviations of a surface from the perfectly flat ideal (a true plane ).

  5. Surface metrology - Wikipedia

    en.wikipedia.org/wiki/Surface_metrology

    Surface metrology is the measurement of small-scale features on surfaces, and is a branch of metrology. Surface primary form, surface fractality, and surface finish (including surface roughness) are the parameters most commonly associated with the field. It is important to many disciplines and is mostly known for the machining of precision ...

  6. Ball (bearing) - Wikipedia

    en.wikipedia.org/wiki/Ball_(bearing)

    The surface smoothness is measured in two ways: surface roughness and waviness. [4] Size refers to the farthest possible distance between two points on the ball's surface, as measured by two parallel plates in contact with the surface. The starting size is the nominal ball diameter, which is the nominal, or theoretical, ball diameter.

  7. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    Means that a given geometric tolerance is true in relation to a certain datum regardless of its actual size (LMC ≤ actual size ≤ MMC). RH: right-hand: Referring to handedness, such as the helix handedness of screw threads or the mirror-image handedness of a symmetrical pair of parts. RHR: roughness height reading: See surface roughness. RL

  8. ISO 25178 - Wikipedia

    en.wikipedia.org/wiki/ISO_25178

    Under 25178, industry-specific taxonomies such as roughness vs waviness are replaced by the more general concept of "scale limited surface" and "cut-off" by "nesting index". The new available filters are described in the series of technical specifications included in ISO 16610 .

  9. Optical flat - Wikipedia

    en.wikipedia.org/wiki/Optical_flat

    The lefthand surface is flat; the righthand surface is astigmatic, with curvatures in two orthogonal directions. An optical flat test in which the angular size of the light source is too small. The interference fringes only show up in the reflection, so the light needs to appear larger than the flat.