| 摘要 |
PCT No. PCT/JP86/00168 Sec. 371 Date Dec. 8, 1986 Sec. 102(e) Date Dec. 8, 1986 PCT Filed Apr. 7, 1986 PCT Pub. No. WO86/06184 PCT Pub. Date Oct. 23, 1986.A numerical control apparatus (10) having an overtravel check function, includes a central processing unit (11), periodically performs pulse distribution, adds an amount of distribution to a present machine position stored in a present machine position register (R2), and checks whether the sum value falls within a preset moving range of a machine. If the value falls within the moving range, the amount of distribution is output and added to the present machine position register (R2) to update the machine position. On the other hand, if the value falls outside the moving range, a corrected amount of distribution obtained by subtracting the present machine position from the overtravel preset value is output and added to the present machine position register (R2) to update the present machine position.
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