Abstract: In an automated quarry operation an unmanned high pressure computer controlled liquid jet cutting system particularly adopted for cutting granite on-site with device for automatically and safely shutting off the operation upon encountering unforeseen, unusual or abnormal technical problems and circumstances such as unworkable hard spots, unusual water pressure etc. The system also includes automatic communication of the status of the system. The system includes a power unit, a balanced oscillator, a communication interface, a plurality of sensors and transducers, an optional mobile system, multiple intensifiers, one or more nozzles with diamond or sapphire orifice and a micro-controller with a control panel for programming and controlling rise and fall, indexer and oscillator system.

Abstract: An improved diamond abrasive saw blade comprising a steel disc having a plurality of slots and resultant projections at its periphery and a plurality of `L` or `T` shaped cutting segments affixed alternatingly in line inversed to each other at the periphery of said disc is described. Also described is a method of retrofitting prior art worn out used blades with novel cutting segments of this invention.