How do you measure Surface Finish?

Surface Finish Measurement quantifies the texture of a surface by measuring the vertical deviations of a real surface from its ideal form. If these deviations are large, the surface is rough; if they are small the surface is smooth


Use of a Profilometer is the traditional method of surface finish measurement using information gained from a trace acquired by running a diamond tipped stylus over the part being tested.


There are dozens of different surface finish parameters that can be reported, some of the more common ones are:

  • Ra – Roughness Average
  • Raa - Arithmetic Average
  • Rz – Average Maximum Height
  • Rt – Maximum Height of the Surface

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