| 摘要 |
<p>A master servo motor (16) and a slave servo motor (21), which rotationally drive a master principal axis (Cm) provided with a center (14) that supports one end of a work piece (W), and a slave principal axis (Cs) provided with a center (18) that supports the other end of the work piece in synchronization with each other are equipped, a slip detection cycle for detecting limiting current values (A1) of the servo motors in which the work piece and the centers are slipped is executed before executing grinding, and when the current values of the servo motors reach a slip threshold value (A2) set on the basis of the limiting current values during the execution of the grinding, a grinding condition is changed to prevent the slip of the work piece and centers before the slip thereof occurs.</p> |
