Tabelle zur Oberflächenrauheit BBS-Systems
Surfface Finish / Measurement / Comparisons

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Oberflächenrauheit einige Beispiele
Some values of surface finish

Surfface Finish / Photo by BBS-Systems / Copyright by BBSSystems Surfface Finish / Photo by BBS-Systems / Copyright by BBSSystems Surfface Finish / Photo by BBS-Systems / Copyright by BBSSystems Surfface Finish / Photo by BBS-Systems / Copyright by BBSSystems
30 µin
( 0.76 µm, 180 grit )
19 µin
( 0.48 µm, 220 grit )
15 µin
( 0.38 µm, 240 grit )
12 µin
( 0.30 µm, 320 grit )


RMS
( Micro-inch )
RMS
( Micron )
Ra
( Micro-inch )
Ra
Micron )
Korn
RMS
( Micro-inch )
RMS
( Micron )
Ra
( Micro-inch )
Ra
( Micron )
Grit
Finish
160 4.06 142 3.61 36
98 2.49 87 2.21 60
80 2.03 71 1.80 80
58 1.47 52 1.32 120
47 1.20 42 1.06 150
47 1.20 42 Befor
Bead Blasting
1.06 USDA Bead Blast
34 0.86 30 0.76 180
21 0.53 19 0.48 220
17 0.43 15 0.38 240
14 0.36 12 0.30 320
10 0.25 9 0.23 400
5 0.13 4(+/-) 0.10 Mirror
Table by BBS-Systems / Copyright by BBS-Systems

Die oben aufgeführten Werte basieren auf Test-Mittellwerten. Es sind Abweichungen zu erwarten. Generell sind an den feineren werten eine Toleranz von +/- 10% angezeigt.
Oberflächen Prüfstandard bei BBS-Systems

The above values are guidelines that are based on the averaging of the results of many tests. Some variation is to be expected. Generally on the finer finishes the average of five readings should be within +/- 10% of the Ra value shown.

  • Grit: Measures the number of scratches per linear inch of abrasive pad. Higher numbers indicate a smoother surface
  • RMS: defined as Root Mean Square roughness, this method measures a sample for peaks and valleys. Lower numbers indicate a smoother finish
  • Ra: Known as the Arithmetic Mean, this measurement represents the average of all peaks and valleys. Lower numbers indicate a smooth finish.

updated Tuesday, October 14, 2003

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