![]() ![]() Electrical Discharge Machining EDM Roughness Comparatorģ. ISO 13 Comparison of Surface Roughness ValuesĢ. Each value uses the same individual height measurements of the surfaces peaks and valleys, but uses the measurements in a different formula.ġ. RMS is calculated as the Root Mean Square of a surfaces measured microscopic peaks and valleys. Ra is calculated as the Roughness Average of a surfaces measured microscopic peaks and valleys. Ra and RMS are both representations of surface roughness, but each is calculated differently. Simply average the height across the microscopic peaks and valleys. Ra is the arithmetic average of surface heights measured across a surface. Number controlled turning, boring, planing, drilling, grinding. Machining marks direction blur, but still visible. Number controlled turning, boring, planning, drilling, grinding. Machining marks blur, but direction obvious. Normal turning, boring, planning, drilling, grinding. Normal turning, boring, planning, drilling, grinding Rough turning, boring, planning, drilling The most coarse machining or good rough casting surfaces ![]() Machining surface finish chart: Ra vs RMS USA Ra(µm) Ra = Roughness, average in micro-meters & micro-inches China's old standard (finish) The values are shown with a typical range and a less frequent range for each manufacturing process. ![]() Surface Roughness Table - Shows the roughness average for different manufacturing processes in micrometers and microinches. ![]()
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