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          SURFACE FINISH COMPARISON CHART

          SURFACE FINISH COMPARISON CHART
          RA is the arithmetic average deviation of the surface valleys and peaks and is often used to specify the roughness of a machined surface. RMS is the root mean square average of the profile height deviations from the mean line of the surface and is mostly used for optical surfaces.
          The term Micro means millionth. So 1 micrometer is 1 millionth of a meter, or .000001 meter. Likewise 1 microinch is 1 millionth of an inch, or .000001".   The term "Micron" refers to 1 millionth of a meter, which is also equivalent to 1 thousanth of a millimeter (.001 mm), and is represented by the greek symbol μ. Ra microinch ( μ" ) is basically the same as the CLA scale, or centerline average.                                                                 
          Some Useful Conversions:
          Inch = " or in       1 microinch (μ") = 0.0254 micrometers (or microns)
          Micron = µ    1 microinch (μ") = 0.0000254mm
          Micro Inch = µ"    0.001" = 0.0254mm
          Micrometer = µm     
          Millimeter = mm     
          Below are equivalent values on various surface measurment scales, and the manufacturing methods capable of producing these finishes.
          New ISO scale numbers   1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
          RMS Microinches ( μ" ) 0.5 1.1 2.2 4.4 8.8 17.6 35.2 64.3 137.5 275 550 1100 2200
          RMS Micrometers ( μ m ) 0.013 0.027 0.055 0.11 0.22 .44 .88 1.6 3.44 6.88 13.75 27.5 55
          CLA or Ra microinch ( μ" ) 0.5 1 2 4 8 16 32 63 125 250 500 1000 2000
          Ra micrometer ( μ m ) 0.012 0.03 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50
          Sand Casting                          
          Hot Rolling                          
          Forging                          
          Permanent-Mold Casting                          
          Investment Casting                          
          Extruding                          
          Cold Rolling                          
          Diecasting                          
          Flame Cutting                          
          Sawing                          
          Planing                          
          Drilling                          
          EDM                          
          Milling                          
          Laser Cutting                          
          Reaming                          
          Broaching                          
          Turning and Boring                          
          Tumbling                          
          Roller Burnishing                          
          Grinding                          
          Honing                          
          Electro-Polishing                          
          Polishing                          
          Lapping                          
          Superfinishing                          
          
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