| 摘要 |
PURPOSE:To protect a tool from breakdown by carrying out air-cut with preset override when the tool and a work do not contact each other and lowering the override to a setting level instantaneously upon contact of the tool and the work. CONSTITUTION:Under the condition where a tool 2 and a work 1 are not contacting, an OFF signal is outputted from a touch sensor 3 and an override controller 4 controls a NC machine 8 with an air-cut override fed from an override arithmetic unit 7 based on a machining program 5 or information of parameters 6. Instantaneously upon detection of contact between the tool 2 and the work 1 through a touch sensor 3, the override controller 4 lowers the override to a level prevailing when an override sensor is turned ON. Thereafter, the override is increased by a time constant and fixed at the increased level. In such a manner, contacting moment and the override at that moment can be specified.
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