Method of error compensation in a coordinate measuring machine
First Claim
1. An articulating probe head comprising a first mount for mounting on a support and a second mount onto which a surface sensing device may be mounted, the second mount being rotatable relative to the first mount about one or more axis, wherein the articulated probe head is provided with at leak one mechanical brake to lock the position of the second mount relative to the first mount about at least one axis and whereby at least one position measuring device is provided to determine the position of the second mount relative to the first mount about said at least one axis in the locked position.
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Abstract
A method of calibrating an articulating probe head comprising the steps of measuring an artefact of known dimensions with the workpiece sensing probe mounted on the articulating probe head, in which the articulating probe head is unlocked. An error functional map is generated corresponding to the difference between the measured and known dimensions of the artefact. Subsequent workpieces are measured with the articulating probe head unlocked and the corresponding correction applied. The true dimensions of the artefact may be determined by measuring it with a probe mounted on an articulating probe head in which the axes of the articulating probe head are locked. A mechanical lock is provided to lock the axes of the articulating probe head.
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Citations
14 Claims
- 1. An articulating probe head comprising a first mount for mounting on a support and a second mount onto which a surface sensing device may be mounted, the second mount being rotatable relative to the first mount about one or more axis, wherein the articulated probe head is provided with at leak one mechanical brake to lock the position of the second mount relative to the first mount about at least one axis and whereby at least one position measuring device is provided to determine the position of the second mount relative to the first mount about said at least one axis in the locked position.
Specification