Calibration of a contact probe
First Claim
1. A method of calibrating a contact probe having a contact element, the method comprising:
- measuring with the contact probe a first geometric property of a calibrated artefact and a second geometric property of the or a further calibrated artefact, the first and second geometric properties being such that a deviation between a measured value and the expected value, resulting from a difference between an effective diameter of the contact element and an assumed diameter used for determining the measured value, has the opposite sign for each of the first and second geometric properties;
identifying a difference in the effective diameter of the contact element from the assumed diameter comprising comparing deviations of the measured value to the expected value for each of the first and second geometric properties to determine whether there is a difference in the deviations; and
determining an effective diameter of the contact probe from the measurements of the first and second geometric property.
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Accused Products
Abstract
A method of calibrating a contact probe having a contact element includes measuring with the contact probe a first geometric property of a calibrated artifact and a second geometric property of the or a further calibrated artifact. The first and second geometric properties are such that a deviation between a measured value and the expected value, resulting from a difference between an effective diameter of the contact element and an assumed diameter used for determining the measured value, has the opposite sign for each of the first and second geometric properties. The method further includes identifying a difference in the effective diameter of the contact element from the assumed diameter including comparing deviations of the measured value to the expected value for each of the first and second geometric properties to determine whether there is a difference in the deviations.
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Citations
16 Claims
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1. A method of calibrating a contact probe having a contact element, the method comprising:
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measuring with the contact probe a first geometric property of a calibrated artefact and a second geometric property of the or a further calibrated artefact, the first and second geometric properties being such that a deviation between a measured value and the expected value, resulting from a difference between an effective diameter of the contact element and an assumed diameter used for determining the measured value, has the opposite sign for each of the first and second geometric properties; identifying a difference in the effective diameter of the contact element from the assumed diameter comprising comparing deviations of the measured value to the expected value for each of the first and second geometric properties to determine whether there is a difference in the deviations; and determining an effective diameter of the contact probe from the measurements of the first and second geometric property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of calibrating a contact probe having a contact element, the method comprising:
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measuring with the contact probe a first geometric property of a calibrated artefact and a second geometric property of the or a further calibrated artefact, the first and second geometric properties being such that a deviation between a measured value and the expected value, resulting from a difference between an effective diameter of the contact element and an assumed diameter used for determining the measured value, has the opposite sign for each of the first and second geometric properties; and identifying a difference in the effective diameter of the contact element from the assumed diameter comprising comparing deviations of the measured value to the expected value for each of the first and second geometric properties to determine whether there is a difference in the deviations, wherein the expected value is a known dimension for the geometric property and/or known relative location of first and second surfaces.
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16. A method of calibrating a contact probe having a contact element having an assumed diameter, the method comprising:
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measuring with the contact probe a plurality of points on a surface of a male artefact and a plurality of points on a surface defining an aperture in a corresponding female artifact; identifying a difference in a diameter of the contact element from the assumed diameter by comparison of the measured points for each of the male and female artefacts; and determining an effective diameter of the contact probe from the measurements of the plurality of points.
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Specification