| 摘要 |
PCT No. PCT/JP93/01416 Sec. 371 Date May 26, 1994 Sec. 102(e) Date May 26, 1994 PCT Filed Oct. 1, 1993 PCT Pub. No. WO94/09419 PCT Pub. Date Apr. 28, 1994.A numerical control apparatus in which tool feed can be stopped at the same time as machining is completed. An interpolating device in a numerical control apparatus interpolates a pulse signal HP supplied from a manual pulse generator and outputs an interpolated pulse signal CP so that the tool is moved along a designated shape prestored in a graphic data memory device. An axis control circuit generates speed commands for respective axes in response to the interpolated pulse signal CP and sends the generated commands to a servo amplifier. The servo amplifier delivers a drive current I to energize servomotors mounted on a machine tool. A load determination device detects the drive current I from the servo amplifier and determines whether the detected current I decreases at a given ratio. When the drive current I decreases, for example, by 5%, a drive stop signal S is supplied. The interpolating device stops outputting the interpolated pulse signal CP in response to the drive stop signal S, and the tool feed is stopped accordingly.
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