| 摘要 |
To grind an outer peripheral surface of a work ( 10 ) for a non-circular rotor by a rotary grindstone ( 22 ) advanced and retreated by an NC control depending on the profile of the work ( 10 ), while rotating the work ( 10 ) about its axis, the following steps are carried out: a first step of detecting a predetermined lift amount of the outer peripheral surface of the work ( 10 ) at a given point to index a standard phase of the work ( 10 ); and a second step of advancing or retreating a grindstone 22 by the NC control depending on a standard phase of the work ( 10 ) indexed at the first step to grind the outer peripheral surface of the work ( 10 ). Thus, even if a special recess is not formed in the outer periphery of the work, the indexing of the standard phase of the work can be achieved properly.
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