| 摘要 |
A system is provided for measuring the time during which a machine tool is performing useful work, such as cutting a work piece. During cutting, the work piece and a work member are in electrical contact with each other. But when both the work piece and work member are rotating with respect to each other and they are not cutting, they are electrically insulated from each other. An electrical circuit having a power source is connected to the machine tool. One terminal of the power source is electrically connected to the work piece and the other terminal is electrically connected to the work member. A first signal is detected during the rotation of the work piece and the work member with respect to each other and the time during which such rotation occurs is measured. A second signal is detected when the machine is performing work and the time during which the machine is performing work is measured.
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