| 摘要 |
PURPOSE:To permit the both sides of the locus on passing to be ground and prevent the generation of step difference by adding correction on the basis of the correction rate or the correction amount onto a position data read from a table and controlling the transfer of a polishing tool according to the correction data. CONSTITUTION:When the grinding operation of a grinding tool 13 is repeated in (i) times, a frequency dividing circuit 9 generates pulses, and a ring counter 10 is advanced, and a decoder 11 reads the count value of the counter 10 and determines the status of a flag 12, and (+) correction flag 12b becomes ON. A control circuit 5 calculates the position data after the correction by adding the correction data (alpha) supplied from a correction-data register 8 into the position data read from a position table 2 each time play-back clock PC is generated, and determines the excitation pattern corresponding to the above-described data, and a motor 7 is driven according to the (+) corrected excitation data, and the tool 13 performs polishing on the locus A+alpha. While, if the (-) correction flag 12c is ON, the tool 13 performs polishing on the locus A-alpha, and the both sides of the locus A can be polished. |
