(DIN EN ISO 4287:1998)
Ra – Arithmetic mean surface roughness: Arithmetical mean of the sums of all proï¬le values
Rmr(c) – Material proportion of the proï¬le: Quotient from the sum of all material lengths of the proï¬le elements at the speciï¬ed section height c (in μm) and the measured
length ln (speciï¬ed in per cent)
RSm – Average groove width: Mean value of the width of the proï¬le elements Xs (formerly S ); for the evaluation, horizontal and vertical counting thresholds are determined.
Rt – Total height of the roughness proï¬le: Sum from the height Zp of the highest m proï¬le peak and the depth Zv of the lowest proï¬le valley within the measured length ln
Rz – Maximum height of the roughness proï¬le: Sum from the height of the highest proï¬le peak and the depth of the lowest proï¬le valley within a sampling length lr
Rz1max – Maximum surface roughness: Largest of the ï¬ve Rz -values from the ï¬ve sampling lengths lr over the total measured length ln
Rz – Surface roughness depth: Mean value of the ï¬ve Rz values from the ï¬ve sampling lengths lr over the total measured length ln
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