Dual-Limb Coordinate Measurement for Precision With Lower Weight
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Solution Overview
Problem
Conventional Coordinate Measuring Machines (CMMs) are heavy, inflexible, and often require dedicated metrology laboratories, limiting their mobility and ability to perform in-line quality control with high precision.
Innovation Solution
A lightweight CMM design featuring a first and second limb with probing and coupling elements, respectively, which allows for flexible installation and operation. The CMM uses sensors and metrology chains to determine the spatial coordinates of object points with high precision, and can be mounted on mobile platforms for increased mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CMM designs are used to ensure high measurement precision, then measurement precision is improved, but weight increases and mobility deteriorates
Solution Approach 1:
The CMM is divided into multiple independent limbs (first limb with probing element, second limb with coupling interface), each contributing to the overall measurement capability while reducing the weight burden on any single component. The segmented structure allows distributed sensing and measurement functions.
Solution Approach 2:
The coupling interface on the second limb serves multiple functions: it provides a reference point for coordinate system definition, enables mechanical coupling to the workpiece, and acts as a measurement target. This multi-functionality reduces the need for separate heavy components.
2Measurement precision
If conventional CMM designs are used to ensure stability for precise measurements, then measurement precision is improved, but ease of operation deteriorates due to limited mobility
Solution Approach 1:
The CMM transitions from a static, fixed installation to a dynamic, mobile system. The lightweight limbs enable the device to be moved and repositioned easily while maintaining measurement precision through the coordinated operation of sensors and metrology chains.
Solution Approach 2:
The coupling interface acts as an intermediary between the CMM and the workpiece, enabling flexible attachment and reference establishment. This intermediary allows the lightweight CMM to achieve stable measurements by creating a rigid connection point without requiring heavy structural support.
3Measurement precision
If conventional CMM designs are used to achieve high measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measurement function is segmented across two independent limbs, each with its own sensor system and metrology chain. This segmentation simplifies the overall system architecture by distributing complexity across modular components rather than requiring a single complex measurement mechanism.
Solution Approach 2:
The second limb with the coupling interface provides self-reference capability by establishing its own coordinate system through the coupling point. This self-service approach reduces the need for external reference systems and complex calibration mechanisms.
Data Source
AI summary
A coordinate measuring machine (CMM) for determining spatial coordinate data of an object point on a workpiece. The CMM comprising, a first limb, a probing element, a second limb, and a coupling interface. The probing element provides probing data regarding an interaction between a sensing area and the object point. The first limb connects the sensing area to a first proximal end. The coupling interface is configured to provide coupling data regarding an interaction between a coupling area and a reference point having a defined spatial relationship to the object point. The second limb connects the sensing area to a second proximal end mechanically constrained to the first proximal end.