| 摘要 |
<p>Apparatus is described which can be used to calibrate a machine or as a machine itself. The apparatus comprises two structures each with three supports spaced in a triangular array thereon. The supports may be balls or sockets. The structures are interconnected by six members and each support has the ends of two members connected to it. When used as a calibration device the members are passive extensible measuring bars and the structures are respectively connected to fixed and movable parts of a machine so that movement of the machine parts causes relative movement between the structures and varies the lengths of the measuring bars. From measurements of the lengths of the measuring bars the actual movement of the machine part can be calibrated. When used as a machine, the members are powered struts by means of which one of the structures, which carries a tool or a probe can be manipulated relative to the other, to position the tool or probe relative to a workpiece. <IMAGE></p> |
