Foley & Lardner
System and method for predicting failure in machine tool
 In system and method for predicting an occurrence of failure in a machine tool, at least one monitor data (for example, position deviation variable of a tool with respect to a target position of the tool as a result of rotation of a servomotor) which is changed according to an operating situation in a series of working processes in the machine tool is detected, a prediction level of failure against the monitor data is set, the prediction level being set according to the operating situation, a comparison period of time is set according to the series of the working processes, the monitor data detected is compared with the prediction level set during a predetermined one of the series of working processes of the machine tool set as the comparison period of time, a failure prediction signal is output when the value of the monitor data exceeds the prediction level, and the prediction of the occurrence of failure is informed through a CRT on the basis of the received failure prediction signal. 
Jatco Corporation
G G G G G G G G G G
G05B G05B G05B G05B G05B G05B G05B G05B G05B G05B
additional additional additional additional additional inventional additional additional additional additional
Tomoaki Masakazu Shinichi Yasumasa
Yoshino Sano Hasegawa Mochizuki