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RMS = Root Mean Square in microinches. CLA = Center Line Average in microinches. N = New ISO (grade) scale numbers. Cut-off Length = Length required for sample.
Mean roughness depth Rz as a rule for all other surfaces. The arithmetical mean roughness value Ra is hardly affected by individual peaks or valleys because it is the mean value of the whole profile.
Surface roughness is the arithmetic average of values at randomly extracted spots on the surface of an object. ’Center-line average roughness(Ra 75)is defined in the supplements to JIS B 0031 and JIS B 0601.»
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The actual surface profile results from the intersection of the actual part surface with a plane perpendicular to this surface. The plane should roughly be vertical to the machining grooves.
Surface Roughness Table 1(0.025) 2(0.05) 4(0.10) 8(0.2) 16(0.4) 32(0.8) 63(1.6) 125(3.2) 250(6.3) 500(12.5) 1000(25) 0.01 0.016 0.025 0.04 0.063 0.10 0.16 0.25
Surface Finish conversion chart or roughness between selected industry standard units. Ra = Roughness, average in micro‐meters & micro‐inches RMS = Root Mean Square in micro‐inches
Surface roughness is the arithmetical average of values at randomly extracted spots on the surface of an object. [Centerline average roughness(Ra 75 )is defined in the supplements to JIS B 0031 and JIS B 0601.]
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