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Find the most up-to-date version of ANSI B at Engineering ASME B / ANSI/ASME B – Surface Texture and Gaging for Screw Threads Package ASME B and ANSI/ASME B The ASME B46 1 ANSI ASME. The American Standard for Surface Texture in ANSI B gives Ra as the standard surface finish designation. In most applications where RMS is called.

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The amplitude sum, A aat a line with the angle, ais defined as:. The table lists the roughness parameters by their symbol, name, corresponding 2D standard and unit. Here, a local minimum is defined as a pixel where all eight neighboring pixels are higher and a local maximum as a pixel where all eight neighboring pixels are lower. The Surfaces Area Ratio, Annsi drexpresses the increment of the interfacial surface area relative to the area of the projected flat x,y plane:.

ANSI-ASME B46.1-1985.pdf

Note, that since SPIP version 4. The hybrid parameters can be described graphically by the above figure. Note, also that roughness values depends strongly on measurement conditions especially scan range and sample density. The Roughness Average, S ais defined as:. If the document is revised or amended, you will be notified by email.


They are defined as the height amsi between the highest and lowest pixel in the image.

When there are less than five valid maximums or five valid minimums, the parameter is not defined. The fractal dimension can also be evaluated from 2D Fourier spectra by application of the Log Log function.

Roughness Parameters

Three parameters are calculated based on this figure. Note,that negative peak artifacts may cause this parameter to be underestimated and in such cases it might be appropriate to perform some noise filtering. Maximum Peak Height Sp: This may be the case for image containing well organized linear structures.

The Mean Summit Curvature, S scis the average of the principal curvature of the local maximums on the surface, and is defined as:.

For a surface with a dominant lay, the parameters will tend towards 0.

Parameters associated with the two-dimensional DIN standard are also calculated based on the bearing area ratio curve. For a Gaussian height distribution S vi approaches 0. In principle, the texture aspect ratio has a value between 0 and 1.

The fractal dimension, D, for each direction is then calculated as. We have no amendments or corrections for this standard. The Cross Hatch AngleSch is the found angle of a cross hatch pattern typically created in seen in cylinder liners and created by a honing process used to ensure proper lubrication. Surfaces with very dominant directions will have Stdi values close to zero and if the amplitude sum of all direction are similar, Stdi is close to 1.


The amplitude properties are described by six parameters, which give information about the statistical average properties, the shape of the height distribution histogram and about extreme properties.

ASME B / ANSI/ASME B – Surface Texture and Gaging for Screw Threads Package

Maximum Valley Depth Sv: The amplitude sum, b ralong a semicircle with the radius, ris. Some of the parameters depend on the definition of a local minimum and a local maximum. For an anisotropic surface the correlation length is in the direction perpendicular to the surface lay. This standard is also available to be included in Standards Subscriptions.

The Mean Half Wavelength, Shwis based on the ansk radial spectrum:. If the surface is fractal the Log Log graph should be highly linear, with at negative slope. Dominant Radial Wave Length.

Proceed to Checkout Continue Shopping. Mean HeightS mean is the mathematical mean height of all pixels.