This report describes the work which has been done in measuring stresses developed during diamond grinding, and summarizes the preliminary phases of this investigation. The technical problems associated with this type of measurement are formidable, and a great deal of work has been put into developing a technique which works very well indeed. It is now possible to identify and measure four of the strains developed in a peripheral diamond grinding wheel during use. These are the radial compression, tangential drag, axial twisting, and bending strains. It is found that these strain pulses do not change shape with change in the nature of the diamond grit, or of the grinding conditions. However, their magnitude varies with the type of grit and the conditions of grinding. This suggests that strain measurements may be used to assess and thus improve grit efficiency. At the same time, wheel efficiency can also be assessed, and the influence of such factors as hub rigidity, bond hardness, and so on, can be studied. A start has been made on this, but the program will be a long and complicated one.

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