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piece material Geometry, composition and material of nozzle Nozzle tip distance (stand-off distance) Mixing ratio Impingement angle 1.3 Characteristics of different variables 1.4 Operating characteristics The main performance measuring parameters of AJM are as follows: The material removal rate in gm/mm 3 The accuracy and surface finish of the machined surface The nozzle wear rate Table 1 Different variable parameters [ 6 ] Medium Air, CO2, N2 Abrasive SiC, Al2O3 (of size 90–150 microns) Flow rate of abrasive 3 to 20 gram/min Velocity 150–300 m/min Pressure 2–8 kg