| viXra.org > Classical Physics > viXra:2012.0012 |
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| viXra.org > Classical Physics > viXra:2012.0012 |
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Classical Physics |
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Authors: Kenneth C. Johnson
The accuracy of precision diamond turning, e.g. for aspheric optics fabrication, can be greatly improved by incorporating dynamic interferometry in the tool position feedback loop. A miniature optical interferometer attached to the cutting tool or tool post measures the displacement between the tool and the workpiece surface, and the interferometer signal controls a fast-servo piezoelectric actuator incorporated in the tool post to minimize mid-spatial-frequency surface machining errors. The interferometer can also dynamically measure the step height across the tool’s cutting line to control low-spatial-frequency surface errors, and high-spatial-frequency roughness can be controlled by optimizing the geometry of the tool’s cutting edge.
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