| 摘要 |
<p>A system for correcting a change in the position of a machine tool that has at least two control axes. A positional change check simulator (14) finds a ratio (R2) of displacements (Xe1, Ye1) of the axes found from the outputs of position detectors (8X, 8Y) that detect the position of the machine tool. Further, presuming that the servo system is a first-order lag system, a ratio (R1) of estimated displacements of the axes is found based on the machine position that is estimated based on the distribution pulses (Xp5, Yp5) of the axes. Position correction means (12) produces correction pulses (Xc1, Yc1) such that the ratio (R2) of displacements will become equal to the ratio (R1) of estimated displacements. The correction pulses (Xc1, Yc1) are added to instruction pulses (Xp1, Yp1). This makes it possible to suppress sudden error in the worked shape near the work starting point and work finishing point or at the corners.</p> |
