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Method and apparatus for the measurement and display of error values of precision machine tools, electronic instruments, etc.

Jonathan D Garman, +1 more
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TLDR
In this paper, a system for measuring and plotting a sequence of error values, for example the positioning errors of machine tools as a function of distance along an axis of travel, the output frequency errors in voltage controlled oscillators, and the like is described.
Abstract: 
A system for measuring and plotting a sequence of error values, for example the positioning errors of machine tools as a function of distance along an axis of travel, the output frequency errors in voltage controlled oscillators, and the like is described. The system for positioning error plotting comprises a laser interferometer for measuring the actual distance of movement of the machine and a novel and simple calculator system including a pair of digital-to-analog converters coupled to the interferometer for determining from this laser interferometer measurement both the desired (or assumptive) distance of movement of the machine and the error distance between the actual distance and the desired distance. By assuming the desired position of the machine, complex interconnections to its controller are avoided. The calculated error distance and distance at which the error occurred are plotted on an X-Y recorder. A similar technique is described for the calibration of voltage controlled oscillators.

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Patent

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