The process of material cutting and fracture by high velocity water jets is a complex series of phenomena which may involve compression, tension, shear, erosion, wears, cracking, wave propagation, and cavitations damage. This makes the exact analysis of the jet cutting process to be very complicated. The problem of water jet coal cutting is a multi response problem. There are two output variables, depth of cut and cutting width whose optimization will results in the increase in the productivity of coal cutting. In this paper a Taguchi Fuzzy decision method has been used to determine the effective process parameters for improving the productivity of coal mines. The Taguchi method of experimental design is a widely accepted technique used for producing high quality products at low cost. The optimization of multiple responses in complex processes is common; therefore to reduce the degree of uncertainty du ring the decision making, fuzzy-rule based reasoning was integrated with the Taguchi loss function

Keywords: Water Jet, Coal Cutting, Taguchi Techniques, Fuzzy Logic, Productivity