-In this study we choose plasma cutting machine as our main machine tool and AISI1018 material also used .with the start of globalization there are many company emerges. So, there are more than one compa ny make similar product to sustain this competitive market we must make product which quality is good and must have low price.so with the use of optimization technique we must make our product more economical and also save time coast.so that's why we consider GRA and some other optimize technique issued to find out optimum solution for the machine where it give its best performance.
Keywords -PAC, Taguchi, Anova, Grey relational analysis
I INTRODUCTIONBasically there are three states of matter i.e. s olid, liquid and gas. The basic difference between them is of energy. Energy of solid is min imu m. If we add energy to solid it is converted into liquid. If we add extra energy to liquid it is converted into gas, when we add extra energy to gas, it beco mes plasma. Plas ma is h ighly ionized and electrically conductive. It is much useful to increase temperature as well as to perform cutting. Plas ma cutting technology is one in which argon, nitrogen and compressed air are used to generate a plasma jet and then n onferrous metal, stainless steel and black metal are cut by the high temperature of the highly -co mpressed plasma arc and the mechanical eros ion of the fast plasma jet.The p lasma arc cutting process is a highly p roductive method of cutting alu minu m and is e xperiencing rapid ly growing application. Cuts can be made fro m thick foil thickness up to 200 mm although cutting in these thicknesses causes extreme noise levels that have to be taken into consideration when considering the suitability of the process.Plasma cutting was developed in the 1950's for severing steel sheet and plate. Today, it is used on nearly all types of conducting engineering materials. One limit ing factor for the plasma process has been the high investment costs. The trend today is that more simp le and inexpensive machinery is used, making plas ma cutting a realistic alternative to other cutting methods. Principle o f PAC.