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Producing a radius or curved edge in cutting glass by means of a high pressure abrasive fluid jet. Abrasive particles are aspirated in carefully controlled amounts into a fluid stream which is directed through a nozzle tube having an elongated passageway of small diameter, and the fluid is discharge

Producing a radius or curved edge in cutting glass by means of a high pressure abrasive fluid jet. Abrasive particles are aspirated in carefully controlled amounts into a fluid stream which is directed through a nozzle tube having an elongated passageway of small diameter, and the fluid is discharged against and closely adjacent the surface of the glass as a highly collimated jet carrying the abrasive particles. The passageway gradually increases in diameter, or flares outwardly, at the discharge end of the nozzle tube, allowing the collimated stream to diverge within confined limits immediately prior to impinging upon the glass surface. The abrasive particle-containing conical fluid jet cuts through the glass along the path followed by the axis of the nozzle tube, while the glass to either side of the cut is abraded by progressively decreasing amounts toward the lateral extremities of the fluid jet. The glass cut is thus formed with a curved edge on the entrant side of the cut. The glass may be similarly treated from the opposite direction by the abrasive jet to produce a completely rounded edge.

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A method of forming a rounded edge in cutting a glass sheet along a desired path with an abrasive liquid jet, comprising advancing the liquid jet in which abrasive particles are entrained through an elongated cylindrical passageway to collimate said liquid jet, discharging said collimated liquid jet

A method of forming a rounded edge in cutting a glass sheet along a desired path with an abrasive liquid jet, comprising advancing the liquid jet in which abrasive particles are entrained through an elongated cylindrical passageway to collimate said liquid jet, discharging said collimated liquid jet closely adjacent said sheet, allowing said liquid jet to diverge within confined limits immediately prior to being discharged against said sheet, the distance said liquid jet travels through said cylindrical passageway being at least two and one-half times the distance traversed in diverging within confined limits, and moving said liquid jet and said sheet relative to one another along the desired path for the cut.