... and the estimated value of the spindle and feed current, namely, Si and Fi (i = 1, 2, . . . , 6) are outputted. Second, the spindle and feed currentdetected are put into the logarithm, and ... Rodriguez, O., and Uragun, B., 1993, Monitoring Drill Conditions withWavelet Based Encoding and Neural Network, Int. J. Mach. Tools and Manuf., vol. 33, no. 4,pp. 559-575.39. Wu, Y. and Du, R. ... assjisiij,,,11axwssj1=∧(), ;xwassj≥=,21,∂∂=Owjsj∆if and then if and then if and then if and then xw x xw xxw x xw xxw w xwxw w xwssj sisiij sssj sisiij sssj...