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XB and XD are the diamond radius and DC is the dresser depth of dress. For a 0.38 mm (0.015") radius diamond taking a 0.025 mm (0.001") depth of dress. CB = 0.137 mm (0.0054"). AB, the pitch per revolution of the grinding wheel, is 0.273 mm (0.0108"). A 406 mm (16") diameter grinding wheel running at 30m/s (5900 sfm) is rotating at 1410 RPM. The diamond traverse speed for 2 overlays is therefore 0.273 x 1410/2 = 192.5 mm/min. (0.0108 x 1410/2 = 7.6"/min.) For 4 overlays the traverse speed would be 96.25 mm/min (3.8"/min.)
Calculating the Proper Diamond Traverse Speed.
The graph on the right shows a plot of the cusp height, measured on a CAD system using a 12.7 mm (0.500") radius with a 2.54mm (0.100") dresser depth of cut for 1, 2, 4 and 6 overlays. Though theoretical, the actual surface finish (Ra) results, when measured on a production machine, follow exactly the same track.