Bearbeitungsgerät für Werkstücke, mit einem auf einem Trägergestell montierten Ausleger

摘要

Machining apparatus comprises a boom rotatable about a pivot support within a cylindrical workpiece with a machining station, such as a milling cutter, mounted on the remote end of the boom. Two angularly spaced wheel units are provided on respective sides of the boom to support the boom on the workpiece. Each wheel unit has an actuator to raise or lower that side of the boom relative to the support surface. Variations in the level of the support surface are determined by sensors monitoring a reference such as a rigid template or a planar laser beam. Each actuator has a respective sensor for independently adjusting each wheel unit and each sensor may be on a radius from the pivot to the associated wheel unit. In an alternative embodiment, the boom is linearly displaceable along spaced rails and the machining station is displaceable perpendicularly to the linear direction along the boom. The boom is mounted on the rails via three or more actuators, preferably four at respective corners of the boom, which are independently adjustable according to the sensed level to raise or lower the respective portion of the boom relative to the rails.