| 摘要 |
A grinding apparatus which is so constructed that three workholders are rotatably mounted on a turn table in equally spaced relation peripherally of said turn table to be intermittently shifted from one to another of three positions consisting of an inoperative position and a first and second working positions. Two grinding mechanisms are arranged exterior of said turn table adjacent said first and second working positions respectively. The table is operative in such a manner that a workpiece mounted on one of said workholders in said inoperative position is carried thereon to said first working position where it is roughly ground and then to said second working position where it is subjected to a finishing grinding and then back to said inoperative position to be removed from the apparatus, the intermittent rotation of said turn table being controlled by a detecting device which detects the amount of the workpiece ground by way of a master which is ground concurrently with said workpiece.
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