Patent ID: 7779827

Claim:
A blade ring saw blade for making straight and curved cuts in hard workpieces, having, in combination: an outer peripheral edge and an inner peripheral edge defining a large central opening for relative movement of the workpieces through the blade during making of curved cuts, the large central opening defining a radius that is greater than the annular width of the blade between the inner and outer peripheral edges; an annular body; an abrasive coating on said body defining said outer peripheral edge and substantially flat outer portions of sidewalls of the blade adjacent said outer peripheral edge; and an abrasive coating on said body defining said inner peripheral edge and substantially flat inner portions of sidewalls of the blade, wherein the abrasive coating on said body defining said outer peripheral edge is different from the abrasive coating on said body defining said inner peripheral edge, the abrasive coating on said body defining said outer peripheral edge comprising sintered diamond particles and the abrasive coating on said body defining said inner peripheral edge comprising electroplated diamond particles.