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 relative amplitudes for the different angles are found by summation of the amplitudes along M equiangularly separated radial lines, as shown in the figure below. Please first log in with a verified email before subscribing to alerts. Three parameters are calculated v46 on this figure.

The Dominating Radial Wavelength, Srwcorresponds to the b64 with radius, r maxhaving the highest amplitude sum, b max: For a Gaussian height distribution S vi approaches 0.

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 Mean Half Wavelength, Shwis based on the integrated radial spectrum:. The Core Roughness Depth, Skis the height difference between the intersection points of the found least mean square line. Valley Fluid Retention Index. The fractal dimension anxi also be evaluated from 2D Fourier spectra by application of the Log Log function.

We have no amendments or corrections for this standard. Maximum Valley Depth Sv: Fourier spectrum and the angular and radial spectra.

Some of the parameters depend on the definition of a local minimum and a local maximum. For Gaussian height distributions S ku approaches 3.


The result is called the angular spectrum. Root Mean Square Gradient.

It is therefore important to include the measurement conditions when reporting roughness data. 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.

This Standard is concerned with the geometric irregularities of surfaces. Before the calculation of the roughness parameters we recommend carrying out a slope correction by a 2 nd or 3 rd order polynomial plane fit. Having found r 0. The Ten Point Height, S10 zis defined as the average height of the five highest local maximums wnsi the average height of the five lowest local minimums:. It also defines parameters anei specifying surface texture. We calculate Std from the Fourier spectrum.

Parameters associated with the two-dimensional DIN standard are also calculated based on the bearing area ratio curve. When there are less than five valid maximums or five valid minimums, the parameter is not defined.

Large values of S ci indicate that the void volume in the core zone is large. If there is a very dominating wavelength, Srwi is close to 0, and if there is no dominating wavelength, it is close to 1.


Each point in the graph corresponds to the normalized power in a circle one frequency pixel wide in the squared FFT image the Power Spectrum Image. The Texture Direction IndexStdiis a measure of how dominant the dominating direction is, and is defined as the average amplitude sum divided by the amplitude sum of the dominating direction:.

Values numerically greater than 1.

All the parameters are based on two-dimensional standards that are extended to three dimensions. The fractal dimension, D, for each direction is then calculated as. For images consisting of parallel ridges, the texture direction is parallel to the direction of the ridges.


ASME B – Surface Texture (Surface Roughness, Waviness, and Lay)

Already Subscribed to this document. The advantage of this is that deviations from the bearing plane can be quantified better when setting the bearing plane to zero see how this is done in the Plane Correction Dialog section. This may be the case for image containing well organized linear structures. All six parameters are defined from the surface bearing area ratio curve ani in the figures below. This standard is also available to be included in Standards Subscriptions. For non-integer values of andthe value of F u pv q is found by linear interpolation between the values of F u pv anso in the 2×2 neighboring pixels.

Large values of S vi indicate large void volumes wnsi the valley zone.

ANSI-ASME B46.1-1985.pdf

For a surface with a dominant lay, the parameters will tend towards 0. Please first verify your email before subscribing to alerts. The Radial Wave IndexSrwiis a measure of how dominant the dominating radial wavelength is, and is defined as the xnsi amplitude sum divided by the amplitude sum of the dominating wavelength:.

The amplitude sum, b ralong a semicircle with the radius, ris.