| 摘要 |
Machining apparatus comprises a boom displaceable along spaced rails and a carriage displaceable along the boom perpendicularly to the displacement direction of the boom. A machining station is adjustably supported on the carriage by three adjustment means to adjust a machine head, such as a milling cutter, towards and away from a workpiece disposed between the rails beneath the machining station. Adjustment of the machine head results from inaccuracies in the level of the rails and/or the displacement of the carriage. Variations in the level of the rails and/or carriage are determined by a respective sensor associated with each adjustment means which monitors a reference defined by a planar laser beam. Alternatively one of the three adjustment means between the machining station and the carriage may be replaced by a pivot with the head adjustment means being arranged to adjust the machine head relative to the remainder of the machining station. In an alternative embodiment, the boom is rotatable about a pivot support within a cylindrical workpiece with the machining station mounted on the remote end of the boom and optionally displaceable with a carriage along the boom. The boom is supported at its remote end on the workpiece by wheel units. 911217.pbbspe.020.furaus2.spec.36
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