Surface finish

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The surface quality is an expression for the roughness in the surface inspection , usually in connection with a manufacturing process or a surface refinement . Common details of the roughness depth are:

  • Average roughness value (arithmetic mean of the deviations from the center line) in μm
  • Average roughness depth (mean value from the measured roughness depths) in μm

Such parameters are measured with a stylus device (special designs are called perthometers , for example ).

Influences on the surface roughness during machining are:

Achievable mean roughness values ​​R a

The achievable mean roughness values ​​in μm of various manufacturing processes with particular care ( values ​​in brackets are average values with normal care. These guide values ​​may vary from case to case).

Older names and visual recognition of the roughness depth

designation R a (µm) feature
roughed 3.2 to 25 Grooves palpable and visible to the eye
settled 1.6 to 3.2 Scoring still visible to the eye
finely finished 0.8 to 1.6 Scoring no longer visible to the eye

Individual evidence

  1. Susanna Labisch, Christian Weber: Technical drawing: Learn independently and practice effectively . Springer, 2013, ISBN 3-8348-9892-9 , pp. 119 ( limited preview in Google Book search).
  2. N. Zwanzer: Lecture Construction 4. Fundamentals of Technical Drawing. P. 10 , accessed on October 3, 2015 .