Surface Roughness Conversion Chart Tables
Manufacturing Knowledge Menu The following charts and tables convert surface finish or roughness between selected industry standard units. Where: Ra = Roughness, average in micro-meters & micro-inches Conversion math at bottom --
Conversions (math): CLA (micro inches) = Multiply Ra(µm) x 40 RMS * (acceptable 1.1 - 1.7 factor) = Multiply CLA x 1.1 Parameter Conversion Formula To convert a known Ra value to a different parameter, use the following formula: Example: Ra to Rt:
Surface Roughness Value Equivalents Thye Waviness is the measure of surface irregularities with a spacing greater than that of surface roughness. These usually occur due to warping , vibrations , or deflection during machining.
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