A new algorithm to measure the straightness of a machine tool and that of a machined work is proposed. This makes it possible to investigate the correlation of the two. The case of an engine lathe is used as an example. The measurement is performed by sensing the relative displacement between the objective and the tool post which carries two sensors and is fed with steps of distance. The machine tool characteristics have the most important effect on the machined work. The method can be extensively applied to measuring the cylindricity.
Measuring the accuracy of machining done on machine tools efficiently is always a problem. Measurement in three dimensions is also a problem in terms of the so called “lead time” in the manufacturing process. We propose a new approach that can, in a limited time, use a CCD camera installed in a machine tool for image-processing and precisely measure the machining accuracy of constantly changing texture patterns created by ball-end milling. This paper has led to the development of hands-on measurement of machining accuracy. Its usefulness and reliability are verified by both simulation of machining accuracy and the actual process of measurement.
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