Method for determining information about one or more recesses in a part

By using a combination of two contact probes on a coordinate positioning device, the problem of accurately measuring small thread features was solved, enabling efficient and accurate determination of the pitch diameter or pitch radius of thread features.

CN122396896APending Publication Date: 2026-07-14RENISHAW PLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
RENISHAW PLC
Filing Date
2024-11-27
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies are inefficient and economical in measuring information about small thread characteristics, such as thread pitch as small as 0.5 mm, pitch diameter as small as 2.65 mm, and depth as small as 0.27 mm, especially in accurately measuring the pitch diameter or pitch radius of the thread.

Method used

Two different types of contact probes are installed on the coordinate positioning device. The first probe is used to obtain measurement data with high absolute position accuracy, and the second probe is used to measure deeper into the recess. The two sets of data are combined to determine the information of the thread characteristics.

Benefits of technology

It enables efficient and accurate measurement of the pitch diameter or pitch radius of small thread features on coordinate positioning equipment, avoiding the need to transfer parts to special equipment and improving measurement accuracy and efficiency.

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Abstract

A method of determining information about one or more recesses in a part, the method comprising: obtaining a first set of measurement data for the part, the first set of measurement data being obtained by a probe mounted on a coordinate positioning apparatus via a probe mount of the coordinate positioning apparatus traversing the one or more recesses; obtaining a second set of measurement data for the part, the second set of measurement data being obtained by the probe mounted on the coordinate positioning apparatus via the probe mount of the coordinate positioning apparatus traversing the one or more recesses; the second set of measurement data having a lower absolute positional accuracy within a measurement volume of the coordinate positioning machine than the first set of measurement data, but wherein the second set of measurement data extends further into the one or more recesses than the first set of measurement data; using the first set of measurement data and the second set of measurement data to determine information about the one or more recesses.
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