Briefly, and in accordance with the invention, an abnormal condition occurring during the operation of the machine tool is immediately detected, and upon detection of {HEAD ~ the abnormal condition} the operation of {TAIL ~ the machine tool} is halted and an alarm device is actuated to warn of the abnormal condition of the machine tool 
Briefly , and in accordance with the invention , an abnormal condition occurring during the operation of the machine tool is immediately detected , and upon detection of { HEAD ~ the abnormal condition } the operation of { TAIL ~ the machine tool } is halted and an alarm device is actuated to warn of the abnormal condition of the machine tool
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