Method for compensating lobing behavior of a CMM touch probe
First Claim
1. A method for compensating a measurement error related to a measurement of a desired measuring point at an object to be measured with a coordinate measuring machine comprising a touch probe, the method comprising:
- providing a three dimensional reference body of known shape and dimension at a known position in a measuring volume of the coordinate measuring machine;
defining multiple reference points to be measured at the reference body;
touching the reference body with the touch probe in defined touching directions according to the multiple reference points and thereby determining positions for the multiple reference points;
deriving a lobing error information for the touch probe based on the known shape and dimensions of the reference body and the determined positions of the reference points, the lobing error information providing error values related to respective touching directions for the touch probe; and
compensating a measurement of the desired measuring point at the object to be measured performed with the touch probe by;
assigning a corresponding touching direction to a defined measuring direction, the measuring direction being defined by a direction of approaching the object with the touch probe, andconsidering the error value related to the assigned touching direction.
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Abstract
A method for compensating a measurement error related to a measurement of a desired measuring point at an object to be measured with a coordinate measuring machine is disclosed. Some embodiments include a touch probe. Some embodiments include a method that includes providing a three dimensional reference body of known shape and dimension at a known position in the measuring volume of the coordinate measuring machine, defining multiple reference points to be measured at the reference body, touching the reference body with the touch probe in defined touching directions according to the multiple reference points and thereby determining positions for the multiple reference points, and deriving a lobing error information for the touch probe based on the known shape and dimensions of the reference body and the determined positions of the reference points, the lobing error information providing error values related to respective touching directions for the touch probe.
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Citations
20 Claims
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1. A method for compensating a measurement error related to a measurement of a desired measuring point at an object to be measured with a coordinate measuring machine comprising a touch probe, the method comprising:
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providing a three dimensional reference body of known shape and dimension at a known position in a measuring volume of the coordinate measuring machine; defining multiple reference points to be measured at the reference body; touching the reference body with the touch probe in defined touching directions according to the multiple reference points and thereby determining positions for the multiple reference points; deriving a lobing error information for the touch probe based on the known shape and dimensions of the reference body and the determined positions of the reference points, the lobing error information providing error values related to respective touching directions for the touch probe; and compensating a measurement of the desired measuring point at the object to be measured performed with the touch probe by; assigning a corresponding touching direction to a defined measuring direction, the measuring direction being defined by a direction of approaching the object with the touch probe, and considering the error value related to the assigned touching direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A coordinate measuring machine comprising:
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a base; a probe head with a touch probe; a machine structure with structural components for linking the probe head to the base; at least one drive mechanism for providing movability of the probe head relative to the base; and a controlling unit adapted for controlling movement of the touch probe;
wherein;a processing unit comprising a compensation function, the compensation function being implemented so that a measurement—
performed with the touch probe—
of a desired measuring point at an object to be measured is compensated on execution of the compensation function and based on a provided lobing error information byassigning a corresponding touching direction of the lobing error information to a defined measuring direction, the measuring direction being defined by a direction of approaching the measuring point with the touch probe, and considering an error value related to the assigned touching direction by the lobing error information. - View Dependent Claims (19)
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20. A non-transitory computer program product having computer-executable instructions implemented for executing and processing the steps of:
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providing a three dimensional reference body of known shape and dimension at a known position in a measuring volume of the coordinate measuring machine; defining multiple reference points to be measured at the reference body; touching the reference body with the touch probe in defined touching directions according to the multiple reference points and thereby determining positions for the multiple reference points; deriving a lobing error information for the touch probe based on the known shape and dimensions of the reference body and the determined positions of the reference points, the lobing error information providing error values related to respective touching directions for the touch probe; and compensating a measurement of the desired measuring point at the object to be measured performed with the touch probe by; assigning a corresponding touching direction to a defined measuring direction, the measuring direction being defined by a direction of approaching the object with the touch probe, and considering the error value related to the assigned touching direction.
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Specification