| 摘要 |
A gear pitch error correction system of a numerical controller for a machine tool including at least one pair of gears disposed in an intermediate position on a transmission path for transmitting the torque of a servo motor to a material to be driven. A pitch error correction value per predetermined rotating angle of a gear is individually measured for each gear for each rotation period of each gear and is stored in a non-volatile memory (14b). Pitch error calculation means (E) refers to a current value register (D), reads out a pitch error data corresponding to the current position from the non-volatile memory (14b) and calculates a superposed pitch error correction value by adding the pitch error data. This superposed pitch error correction value is added to an interpolation pulse from interpolation means (B) by an adder (C) to gernerate an output pulse having the corrected pitch error, and this output pulse is outputed to an axis control circuit (18). Accordingly, a fine pitch error correction can be made in proportion to the superposition level of the gear pitch error correction value of each gear even when the number of the gear pitch error correction values for each gear is not much great. <IMAGE> |
