Nine replicated EDM surface finish specimens ranging from 16 to 250 microinches.
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The surfaces used in this scale are reproductions of accurately machined surfaces measured in microinches (millionths of an inch 0.000001"). The numbers engraved alongside each surface are the average deviation from the mean surface expressed in microinches.
The E-9 Electrical Discharge Machined Microfinish Comparator (EDM) Surface Roughness Scale provides the industry with established flat surface roughness specimens for visual and tactual comparison.
It is used in specifying and controlling surface roughness when a product having the appearance of typically machined surfaces is required.
The E-9 Electrical Discharge Machined Microfinish Comparator (EDM) Surface Roughness Scale provides an economical tool which permit roughness to be specified on the same basis as linear measurements. The surfaces presented are the result of years of research and engineering. Details covering this subject are now published in the American National Standards Institute (ANSI) specification titled: "Surface Texture, Surface Roughness , Waviness and Lay" ANSI/ASME B46.1
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