| 摘要 |
<p>A method for starting back-lash correction at an optinum point ahead of a predetermined time from the point of reversal of a speed command without being affected by a feed speed, etc. A moving command of one previous cycle is subtracted from a moving command of one preceding cycle with respect to a distribution cycle to determine accelaration in this distribution cycle, and the absolute value of the sum is multiplied by a constant K which is determined by the frictional force of a machine and the product is stored in a register A. When the speed command corrected by a feed-forward quantity FF at the time of reversal of the moving command reaches the memory value of the register A (S18, S19), back-lash acceleration correction is started. In this way, back-lash correction is started from a predetermined time before the reversal point of the sign of the speed command.</p> |
