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Stylus Profilometry Method

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Definition: The stylus profilometry method is a tactile measurement technique for determining surface roughness, in which a diamond stylus tip traces the surface along a defined measurement length. The height profile is recorded and evaluated mathematically. The normative bases are DIN EN ISO 4287 and ISO 16610.

Practical relevance: Parameters such as Ra, Rz or Rt are calculated from the profile. The choice of cut-off wavelength (λc), filter type and measurement length significantly influences the result. The method is well established for the quality control of sealing faces, bearing locations and tribologically loaded components. The stylus tip radius and force must be matched to the surface.

Decision-making perspectives:

  • Technical decision-makers: Ensuring function-appropriate roughness parameters for friction and sealing systems.
  • Purchasing/project management: Clear specification of roughness parameters and measurement conditions in drawings.
  • Science: Analysis of filtering methods and comparison with optical 3D topography.
  • Insurance/law: Traceable verification of surface requirements in the event of functional deviations.

Typical testing or verification methods: Profile acquisition with a stylus instrument, filtering in accordance with ISO 16610, parameter evaluation (Ra, Rz).

FAQ:

  • Why is the choice of filter important in the stylus profilometry method?
  • It separates roughness from waviness and significantly influences the calculated parameters.
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