fraisa.com 869 i d2 1 - fz² d2 1 - ae2 d1 d1 4 4 2 2 Rth,vf = Rth,ae = · 1000 - - · 1000 μm μm √ √ Calculation formulas for cutting data Theoretical surface roughness and surface qualities Surface qualities Surface roughness in the direction of feed vf Surface roughness in the infeed direction ae Maximum roughness values Ra in μm; 1 μm = 0.001 mm 3.2 1.6 0.8 0.4 0.2 0.1 Roughness classes N8 N7 N6 N5 N4 N3
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