1. Introduction into the Issue of Water Jet Machining

The ways of searching for methods of increase of efficiency of the process of machining by water jet, of shortening the time inevitable for cutting the individual components with preservation of the quality of the machined area or of reduction of vibration size have not been completed yet. Vice versa, the technology—besides the unlimited assortment of sectile material—disposes a tool without negative effect upon a workpiece or environment and has become a progressive technology in the course of the last years. The infinite or progressive technology of machining by abrasive water jet has gained an importance by adding the abrasive substances. High speed of outflowing water jet with admixture of abrasive allows intensive, economic and ecological machining of almost all industrial materials.