Method and apparatus to correct for gravitational sag in the articulated mounting of a probe in a coordinate-measuring machine
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Jan 16, 1991
filing date -
Jan 19, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention contemplates a technique to correct for measurement error which is attributable to gravitational sag of a probe head (6) mounted to a multiple-axis articulating head (2). To this end, a variable (b) is determined which describes the stiffness of the articulating head (2) and/or of a probe extension (5) mounted thereto, said variable being characteristic for the probe configuration in question and being entered into the memory of the computer of the coordinate-measuring machine. The sag B (.alpha., .beta.) which has differing values that depend on actual angular positions (.alpha., .beta.) is then calculated from these angular positions for each of the angular positions, and the calculated sag value is appropriately taken into account in computer-reporting of coordinate-measurement values made by the machine. Calibration of the articulating head in each of the various different angular positions is therefore unnecessary.
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