Waterjet machine uses cold supersonic abrasive erosion to cut almost any materials both metals and nonmetals. The highly pressurized water stream is forced through a tiny area which carries abrasive garnet to erode away the material.

Abrasive waterjet and pure waterjet both start with pressurized water, water is pressurizes up to 60,000 p.s.i, or 4100 bar, then is transported to the cutting head where the pressurized water passes through a tiny hole in jewel orifice. The pressure is exchanged for velocity which is what the waterjet cuts with, waterjet actually erode the material they are cutting. After we pass the waterjet stream through orifice, the garnet abrasive similar to that you find on to sand paper is feed through a delivery line which is located on the side of the cutting head, where it is pulled in to the waterjet stream via vacuum effect, and accelerated down the mixing tube. The abrasive garnet is mixed into water-stream and is accelerated like a bullet out of a rifle.

Water jet cutting works by forcing a large volume of water through a small orifice in the nozzle .The constant volume of water traveling through a reduced area causes the particles to accelerate .This accelerated stream leaving the nozzle impacts the material to be cut. The extreme pressure of the accelerated water particles contacts a small area of the work piece. In this small area the work piece develops small cracks due to stream impact. The water jet washes away the material that "erodes" from the surface of the work piece. The crack caused by the water jet impact is now exposed to the water jet the extreme pressure and impact of particles in the following stream cause the small crack to propagate until the material is cut through.

Long regarded as a tool for trained experts, abrasive jets have changed dramatically in the last few years. New technologies have made it possible for just about any machine or fabricating shop to purchase and profitably operate a precision abrasive jet cutting system, with little or no prior experience.