| 摘要 |
A polar coordinate apparatus for performing an operation on a three-dimensional workpiece. The apparatus comprises an arcuate track having a rigid carrier member slidably supported thereon, such carrier including a motor for selectively positioning the carrier along the arcuate track. A radial support arm is slidably connected to the carrier and is provided with a motor for controlling the position of the radial support arm with respect to the carrier. Further, a working implement, such as a milling device, is connected adjacent one end of the radial support arm so as to be capable of engaging a workpiece. Advantageously, the radial support arm may also be rotatable with respect to its point of connection to the carrier, and the working implement may be rotatable with respect to its point of connection to the radial support arm. A workpiece is supported on a rotatable turret plate, and a motor is provided for rotating the turret plate, together with the workpiece, about a substantially vertical axis. The turret plate is also slidably supported by horizontal guide rods, and a motor is provided for selectively positioning the turret plate and workpiece along such guide rods. The guide rods are oriented so as to be both substantially horizontal and substantially perpendicular to the plane defined by the arcuate track.
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