Validation metrology of the large optics diamond turning machine

We present the results of field validation measurements designed to test the positioning accuracy and kinematic performance of the Large Optics Diamond Turning Machine (LODTM), constructed at Lawrence Livermore National Laboratory. Field measurements were performed during January-February and November, 1984, and are sufficient to characterize the capabilities of LODTM when used as a measuring machine. No part cutting tests were done. Measured errors include those due to machine drift, position repeatability, laser length scales, slide straightness, tool bar angular motions, axis geometry, and spindle motion. The static and dynamic performance of the Fast Tool Servo was assessed by bench tests at NBS. We also identify those aspects of machine behavior which are potentially problematic in fabrication of large optics with figure errors within the design specifications of LODTM.

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