| 摘要 |
PURPOSE:To maintain the working precision of a work independently of the degree of abrasion of a plug gauge by installing a fitting detecting means for a plug gauge, work feeding position detecting means, and a working time adjusting means and continuing the working during the calculated time after the plug gauge is inserted into the work. CONSTITUTION:When the inner surface of a work 2 is ground to the dimension of a plug gauge 1, said gauge 1 is fitted into the work 2. The fitting operation is detected by a fitting detecting means 15, and the feeding position of the work at that time is detected by a feed position detecting means 3 and input into a working time adjusting means 4. When the above-described feeding device is on this side from a prescribed feed position of the work, the time for the additional work is calculated after the work 2 is fitted onto the plug gauge 1, by the working time adjusting means 4, and the instruction of additionally working the work 2 for the additional working time is transmitted after the plug gauge 1 is inserted into the work 2, and the work 2 is additionally worked. Therefore, the grinding shortage due to the abrasion of the gauge is corrected.
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