| 摘要 |
PROBLEM TO BE SOLVED: To improve the working efficiency in the case where a difference between depth of a hole to be bored and a total of cutting quantity is positive and smaller than the predetermined allowable value by increasing the cutting quantity by the difference for working. SOLUTION: An NC device obtains a coordinate S of a surface of a top plate, and obtains the depth H expressed as B-S. B means a coordinate of a working concluding position. The depth H and a totalΣhi of the cutting quantity (hi) of the i-th time (i=1-n) are compared with each other, and in the case of H<=Σhi, processing is concluded, and in the case of H>Σhi,α, and (k) (k=H-Σhi) are compared with each other.αmeans an allowable value. In the case of k<=α, h1+k and hm are compared with each other, and in the case of hi+k<=hm, h1+k is substituted for h1 stored already, and processing is concluded. In the case of h1+k>hm, hi+1 is stored as hi+1=k, and processing is concluded. h1+k is controlled at a value less than the allowable cutting quantity hm so as to prevent the lowering of the lifetime of a drill.
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