| 摘要 |
In a machine tool, a component such as a grinding wheel acts on a work-piece to form the latter into a circularly asymmetric shape, for example, a crankpin. Movement of the grinding wheel is controlled by a control signal which is derived from theoretical relative positions and positional velocities of the grinding wheel relative to the work-piece. In the course of at least one revolution of the work-piece, the respective positions of the grinding wheel relative to the work-piece are measured for each of a succession of angular positions of the work-piece. The measured positions are compared with corresponding theoretical positions and data indicative of any differences are stored, and then used to modify the control signal during a subsequent revolution of the work-piece so as to compensate for any of said differences and thereby reduce the magnitude of any error which would have resulted from the measured positional differences. |
