| 摘要 |
PURPOSE:To make the followability of a spindle rotational position to a feed position so better and perform highly precision high speed thread cutting by means of a tap, by installing a device which operates a rotational command value from a feed deviation on the basis of a screw pitch, and making a rotating motor perform synchronized operation. CONSTITUTION:A variation E (Z) is operated by a deviation counter 23 with a feed command value Z out of an input unit 21 and a feed position pulse (z) of a pulse generator 9, while a speed signal v (z) out of a tachometer generator 8 is inputted and a servoamplifier 24 drives a feed motor 7. A rotational command value R is operated from the deviation E (Z) to be inputted into a computing element 25 and a pitch command value P out of the input unit 21. A rotation compensating value r (z) equivalent to a feed rate (z) is operated by a computing element 29 with the feed position pulse (z) and the pitch command value P, and a rotational deviation E (r) is operated by a deviation counter 28 with a rotational position pulse (r) of a pulse generator 14, then the rotational command value R is compensated by an adder 26, a rotational command value R (E) is outputted to a servoamplifier 27, and a speed signal v (r) of a tacho- generator 13 is inputted, thus a rotating motor 12 is driven.
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