| 摘要 |
<p>A clamping body for use in the performance of an operation on a workpiece is disclosed. The clamping body comprises a receiving surface to receive a workpiece, at least two special positioning recesses at the receiving surface of the clamping body, the special positioning recesses each having a cross-section which narrows in a direction away from the receiving surface end being adapted to receive a positioning element for the use of positioning the workpiece free of play, and a reference disposed at a precise predetermined position relative to a three-dimensional rectangular reference co-ordinate system defined by the at least two special positioning recesses in the plane of the receiving surface and being detectable by measurement even if the whole of the receiving surface is covered by the workpiece. At least one precise measure of the predetermined position extending in parallel with one axis of the rectangular reference co-ordinate system is derivable from the reference.</p> |
