| 摘要 |
PURPOSE:To judge the presence of a work and dispense with a work detecting mechanism and a work information transfer job, by comparing the measured value of the work with that of parts other than it, in case of a method of measuring a drilling hole diameter with an air measuring device in an FMS line or the like. CONSTITUTION:A measuring unit 2 on a bed 1 is shiftable in an arrow direction, a measuring head 4 is installed on this unit, and a bore diameter of a work 7 is measured by air with measuring nozzles 5 and 5'. The work 7 is clamped to a fixture body 3 on the bed 1 by a work clamper 6. First, the measuring unit 2 stores the measured value alpha at a zero position, then the measuring unit 2 goes forward and measures a bore diameter of the work 7 (measured value = beta), if +NG comes out, alpha and beta are collated with each other, and if alpha betais the case, it judges that the work 7 is none, and measurement O.K. is fed back to a machine, thus the machine is able to do continuous operation. If alpha betais the case, it judges that the work 7 is presence, whereby the machine is stopped for reasons of a failure in the measured value. With this method, a work detection mechanism and a work information transfer job are no longer required, that is, economy and improvement in reliability.
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