| 摘要 |
PURPOSE:To compensate a difference from the theoretical value by a drive part, by furnishing a tool holder, sliding in the Y direction driven by a micro-displacement drive part, on a tool rest, and by measuring the position of the tool holder with an optical measuring instrument. CONSTITUTION:The X and Y positions of a tool holder 4 are measured by laser measuring instruments 12, 13, and the output pulses therefrom are counted by counters 14, 20. The calculated value X of the X-axis counter 14 is fed into an operator circuit 15, and the theoretical position on the Y axis corresponding to the X-axis position is calculated according to the desired curvature to be machined. The output value y with the Y-axis counter 20 is compared with the theoretical value Y of the operator circuit 15 to control a micro-displacement element 6. The counted value y held at a holder circuit 21 is compared with the theoretical value Y by the comparator 20, and every difference exceeding a specific value DELTAy is fed into an additive register 19 to give a drive signal DELTAY for driving a certain distance, and thus tool rest 5 is driven for DELTAY step by step. Accordingly the micro-displacement element can be always held in work within a proper range. |
