| 摘要 |
PURPOSE:To permit the high-precision correction without giving an influence to the correction precision of a straight-line part by releasing the lift of a stylus immediately before starting the correction for the straight-line part of an abrasive wheel in relation to the NC operation for shifting a traverse base and permitting the position detection with high accuracy. CONSTITUTION:When a hydraullic control circuit 55 receives a lift instruction, the control circuit 55 retreats a stylus S to a riding-over position from an original position, and a servomotor SMU is revolved by the operation of a pulse generation circuit 52, and a correction head 27 is shifted to an abrasive wheel G side by the cutting-in amount, and then a traverse base 23 is advanced rightward by the pulse of a drive unit DUW, and the stylus S rides-over a circular part Tc and shifts to Ta side, and then the center of the stylus S comes to the position before by a certain amount from the terminal edge of the circular part Tc. At that time-point, a lift return instruction is transmitted to the circuit 55, and the stylus S can be transferred to the abrasive wheel G side, following to the circular part Tc, and a straight-line part Ga is corrected.
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