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Mechanical surface is the surface that is generated by tracing the surface of the workpiece with an ideal stylus ball and morphological filtering.

Stylus method is a measuring method for the two-dimensional recording of a surface by moving a probe system hori­zontally over the sur­face using a feed drive mechanism.
(DIN EN ISO 3274)

Entire profile is the profile of the me­chan­ical surface recorded using the stylus method. The most im­por­tant shape deviations of this pro­file are: form deviations, wavi­ness, and rough­ness. (DIN EN ISO 3274)

Parameters, except for the pa­ram­eters that are defined via section lengths lsc (e.g. Rz, Rp, Rv), are calculated via the evaluation length le.

Traversing length lt is the total dis­tance the probe system covers to re­cord the traced profile. It is the sum of the pre-travel length, evaluation length le and post-travel length.

Nesting index Nic (previously "cutoff wavelength") see "Profile filter".

Evaluation length le is the part of the trav­ers­ing length that is being eval­uated.

Section length lsc (previously "sam­pling length") is part of the eval­uation length. Parameters such as Rz, Rp and Rv are evaluated over several con­secu­tive profile sections of length lsc.

Number of sections nsc refers to the number of sections that are used for the evaluation of param­eters Rz, Rp and Rv; five sections are usually used.

Pre-travel length is provided for the transient effects of the filters.

Post-travel length is provided for the attenuation effects of the filters.