Rotatable Extended Stylus for CMM Measurement Complexity
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Solution Overview
Problem
Coordinate measuring machines face challenges in accurately measuring components with higher order rotational symmetry, such as small gearwheels or blisks, due to deflections and complex geometric structures, leading to unpredictable path behavior and increased complexity with multiple probes.
Innovation Solution
An extended stylus with a rotatable extension element and a connection element, featuring a shaft portion aligned at an angle to the axis of rotation, allows for precise measurements by enabling controlled rotational movement and signal transmission, reducing system complexity through a 1-Wire bus interface and a probing contact element at the end of the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different probes are used for measurements on complex workpieces, then measurement coverage and functionality are improved, but system complexity and outlay increase considerably
Solution Approach 1:
The extended stylus with rotatable extension element serves multiple measurement functions that would otherwise require separate probes. The rotation mechanism allows the single stylus to access different measurement positions and orientations, replacing the need for multiple specialized probes while maintaining measurement coverage on complex workpieces with higher order rotational symmetry
2Adaptability or versatility
If gimbal-mounted sensors are used for measurements on components with high rotational symmetry, then measurement capability is improved, but deflections become difficult to control and path behavior becomes unpredictable
Solution Approach 1:
The extension element is designed to be rotatable about an axis of rotation, allowing dynamic adjustment of the stylus orientation during measurement. This rotational capability enables the system to adapt to different measurement positions on workpieces with rotational symmetry while maintaining predictable path behavior through controlled rotation rather than relying on gimbal-mounted sensors with difficult-to-control deflections
Data Source
AI summary
A coordinate measuring machine for measuring coordinates or properties of a workpiece includes an extended stylus. The extended stylus includes an extension element and a connection element. The extension element includes a carrier portion mounted at the connection element so as to be rotatable about an axis of rotation. The extension element includes, on a side remote from the connection element, a shaft portion that is aligned so as to deviate from the axis of rotation. The coordinate measuring machine includes a measurement head to which the extended stylus is attached. The measurement head is configured to measure deflections of the stylus resulting from contacts of the extended stylus to the workpiece.