The surface of every component has some form of texture which varies according to its structure and the way it has been manufactured. Surface texture parameters or surface finish parameters can be separated into three basic types:. High precision and high standard our range of Surface Profilometers for your business applications. The evaluation length 'L' is defined as the length of profile used for assessing surface roughness parameters.
Ra: Ra is the universally recognised, and most used, international parameter of roughness. It is the arithmetic mean of the absolute departures of the roughness profile from the mean line. Rq: Rq is the rms root-mean-square rms value of the departures of the profile from the mean line.
Rq is sometimes referred to as RMS. Talyprofile software for surface roughness, form and contour measurement. Start your free trial for 3 months! Designed for surtronic s series, intra and PGI Optics products. Surface Finish Analysis Software See the demonstartion on how to connect surtonic s surface roughness tester to Talyprofile Watch Video!
Rv is the maximum depth of the profile below the mean line within the sampling length. Rp is the maximum height of the profile above the mean line within the sampling length. Rt is the maximum peak to valley height of the profile in the evaluation length. Rp1max is the largest of the individual peak to mean from each sample length. Rv1max is the largest of the individual mean to valley from each sample length. Wv, Wp, Wt, Pv, Pp and Pt are the corresponding parameters from the waviness and primary profiles, respectively.
Rsk — Skewness — is the measure of the symmetry of the profile about the mean line. It will distinguish between asymmetrical profiles of the same Ra or Rq. Rku — Kurtosis — is a measure of the sharpness of the surface profile.
Rsk and Rku are calculated within the sampling length. Wsk, Wku, Psk and Pku are the corresponding parameters from the waviness and primary profiles, respectively. Cost-effective contract measurement services for your business applications. Get Measurement Services. Rz1max is the largest peak to valley in any sampling length within the evaluation length. Rdq is a first approach to surface complexity. A low value is found on smooth surfaces while higher values can be found on rough surfaces having microroughness.
RPc, peak count number. Was introduced in Amendment 1. Provides the density of peaks per unit of length. Rmr, material ratio at a given depth. This parameter gives the percentage of material cut at a given depth from the top of the profile. The reference may also be taken from the center line or another reference height c0. Rdc, profile section height between two material ratios. This calculation excludes the highest peaks that will be worn out and the deepest valleys that will be filled in.
Material ratio calculated on the Abbott-Firestone curve. Toggle navigation Guide. Can we Compare Ra and Sa? Amplitude parameters Rt, total height of the profile : height between the deepest valley and the highest peak on the evaluation length. Maximum profile peak height Rp Represents the maximum peak height Zp of a profile within the sampling length.
Pp The maximum peak height of the primary profile Wp The maximum peak height of the waviness profile In the case of a roughness profile. Maximum profile valley depth Rv Represents the maximum peak height Zp of a profile within the sampling length. Mean height Rc Represents the mean for the height Zt of profile elements within the sampling length.
Total height Rt Represents the sum of the maximum peak height Zp and the maximum valley depth Zv of a profile within the evaluation length, not sampling length. Ten-point mean roughness Rzjis Represents the sum of the mean value for the height of the five tallest peaks and the mean of the depth of the five deepest valleys of a profile within the sampling length.
Arithmetic mean deviation Ra Represents the arithmetric mean of the absolute ordinate Z x within the sampling length. Pa The arithmetic mean height of the primary profile Wa The arithmetic mean waviness Note One of the most widely used parameters is the mean of the average height difference for the average surface. Root mean square deviation Rq Represents the root mean square for Z x within the sampling length. Pq The root mean square height for the primary profile Wq Root mean square waviness Note This is one of the most widely used parameters and is also referred to as the RMS value.
Skewness Rsk The quotient of the mean cube value of Z x and the cube of R8 within a sampling length. Kurtosis Rku The quotient of the mean quadratic value of Z x and the fourth power of Rq within a sampling length. Mean width RSm Represents the mean for the length Xs of profile elements within the sampling length.
Pdq The root mean square slope for the primary profile Wdq The root mean square slope for the waviness Note The steepness of the surface can be numerically represented with this parameter. Material ratio curve and probability density curves Material ratio curves signify the ratio of materiality derived as a mathematical function of parameter c, where c represents the height of severance for a specific sample.
Pmr c The material length rate of the primary profile formerly tp Wmr c The material length rate of the waviness In the case of a roughness profile.
Profile section height difference Rdc Rdc signifies the height difference in section height level c, matching the two material ratios. Pdc The section height level difference for the primary profile Wdc The section height level difference for the waviness profile In the case of a roughness profile. Pmr The relative material length rate of the primary profile Wmr The relative material length rate of the waviness profile In the case of a roughness profile.
Motif parameters Motif parameters are used for the evaluation of surface contact status based on the enveloped features of the sample surface. AR Mean spacing of roughness motifs: the arithmetic mean of roughness motifs ARi calculated from the evaluation length R Mean depth of roughness motifs: the arithmetic mean of the roughness motif depth Hj calculated from the evaluation length Rx Maximum depth of roughness motifs: the maximum value of the Hj calculated from the evaluation length AW Mean spacing of waviness motifs: the arithmetic mean of the waviness motif AWi calculated from the evaluation length W Mean depth of waviness motifs: the arithmetic mean of the waviness motif depth HWj calculated from the evaluation length Wx Maximum depth of waviness motifs: the maximum value of the HWj calculated from the evaluation length Note These parameters are suited to evaluating the slippage of lubrication mechanisms and contact surfaces, such as gaskets.
Maximum peak height Sp This parameter expands the profile line roughness parameter Rp three dimensionally. Maximum pit depth Sv This parameter expands the profile line roughness parameter Rv three dimensionally. Arithmetical mean height Sa This parameter expands the profile line roughness parameter Ra three dimensionally. It represents the arithmetic mean of the absolute ordinate Z x, y within the evaluation area. Root mean square height Sq This parameter expands the profile line roughness parameter Rq three dimensionally.
It represents the root mean square for Z x, y within the evaluation area. Skewness Ssk This parameter expands the profile line roughness parameter Rsk three dimensionally; parameter Rsk, is used to evaluate deviations in the height distribution. Kurtosis Sku This parameter expands the profile line roughness parameter Rku three dimensionally; Rku, is used to evaluate sharpness in the height distribution. Root mean square gradient Sdq This parameter expands the profile line roughness parameter Rdq three dimensionally.
Developed interfacial area ratio Sdr This signifies the rate of an increase in the surface area. Note Sdr values increase as the surface texture becomes fine and rough. Sk Core height: the difference between the upper and lower levels of the core Spk Reduced peak height: the mean height of the protruding peaks above the core Svk Reduced valley height: the mean height of the protruding dales beneath the core Smr1 The areal material ratio segmenting protruding peaks from the core indicated as a percentage Smr2 Areal material ratio segmenting protruding valleys from the core indicated as percentage Note This parameter is suitable for evaluating friction and abrasion.
Peak extreme height Sxp The difference in height between the p and q material ratio. Vvv Dale void volume Vvc Core void volume Vmp Peak material volume Vmc Core material volume Note This parameter is often used to evaluate abrasion and lubricant retention.
Texture direction Std This parameter indicates the direction angle of the texture parallel groove orientation, etc. Density of peaks Spd This is the number of peaks per unit area. The parameter is calculated from the number of peaks divided by the projected area. Arithmetic mean peak curvature Spc Spc indicates the mean principle curvature average sharpness of the peaks. Ten-point height of surface The average value of the heights of the five peaks with the largest global peak height added to the average value of the heights of the five pits with the largest global pit height.
Five-point peak height S5p The average value of the heights of the five peaks with the largest global peak height. Five-point pit height S5v The average value of the heights of the five pits with the largest global pit height. Sorry, this page is not available in your country Let us know what you're looking for by filling out the form below. People's Rep. Company Division. Yes, send me product updates and news. Please choose your areas of interest.
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