Roundness measuring
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United States of America Patent
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-
Jul 20, 1999
Grant Date -
N/A
app pub date -
May 28, 1997
filing date -
Oct 18, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A roundness measuring machine is described which measures the position of the surface of an object as the object is rotated on a turntable. The machine determines the circle which is the best fit to the measured points and converts the measurements to distances from the best fit circle. An improved algorithm for determining the best fit circle is used in place of the limacon fit. Calculated differences between the measured surface position and the best fit circle are corrected for the effect of measuring the difference in the direction towards the center of rotation of the turntable instead of in the direction towards the center of the circle. Data values are calculated representing points at equal angles around the center of the best fit circle rather than equal angles around the center of rotation of the turntable. The improved accuracy of correction allows the machine to tolerate greater eccentricity of the workplace relative to the turntable, reducing the necessity for accurate centering of the workpiece.
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