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Maximum roughness depth refers to Rmax or Ry. Rmax is the maximum peak to valley profile height. Rmax, Ry, Rz1max or Rymax has the highest value of all peak to valley surface texture parameters. The single roughness depths are first determined by measuring the peak to valley distance within each...

...application-specific. eter is best for all types of parts, and many applications are best. Often one parameter is incapable of defining a surface ade-. served by using two or more parameters: for example, Ra in com-. quately, and two, three or even more parameters are required to bination with Rmax... reduce or eliminate them. Parameters. The Ra parameter measures average roughness. It is not sensitive to occasional spikes and gouges. On the. other hand, the Rmax parameter is designed to detect these anomalies. The two surfaces shown here have. nearly identical Ra values but very different Rmax...

Rmax = the maximum peak-to-valley distance within one cutoff length. Cutoff is a method of separating or filtering the wavelengths of a component. The filter determines how much waviness is included in the assessment length. A lower cutoff generally means that the values are less affected...

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