| 摘要 |
A numerically controlled machine for processing printed circuit boards, including a workpiece holder and at least one operating unit that includes a motor arbor with an exchangeable tool, and a feed mechanism with a drive motor, a control mechanism, and a first movement-measuring system. For each operating unit, there is provided a respective second movement-measuring system that is disposed thereon, and a respective reference measuring point on the workpiece holder, with the aid of which there can be measured a distance between a tip of the tool and an abutment surface of the operating unit that rests upon a workpiece during a processing operation. Prescribed drilling depths are correctable in the control mechanism of the feed mechanism via the measured distance value. This compensation of respective tolerance values is effected independently for each operating unit. |
