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Figure 18.15 A. A loaded grinding wheel B. Te same wheel which has been dressed to remove all the loading
Figure 18.16 Dressing and truing a surface grinding wheel that is loaded with a diamond wheel dresser
18.7 Glasing of grinding wheel
Te condition of a grinding wheel is easily recognised by the shiney appearance on the grinding face of the grinding wheel. Glasing occurs when the abrasive grains become dulled or blunt and do not break away from the bond to reveal fresh grain (the grinding wheel does not possess a self-sharpening action).
Te reason for glasing is that the grinding wheel is too hard for the workpiece. Too light a feed or grinding pressure will cause the grinding wheel to glaze and thus prevent the grinding wheel from cutting. Glasing can be reduced or remedied by increasing the grinding wheel feed which tends to release the grain more quickly before it becomes glazed.