Multi-Axis Assembly Positioning for 3D Coordinate Measuring Machines
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Solution Overview
Problem
Existing positional tracking systems for three-dimensional measuring or machining machines are restrictive when the machine needs to be frequently moved relative to the measured object, requiring repeated initialization of the identification process.
Innovation Solution
A multi-axis assembly with two coupled articulated arms, equipped with integrated angular encoders, allows the machine to be positioned in a fixed frame of reference, enabling flexible movement by automatically calculating displacements and maintaining precision without the need for repeated initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed reference frame system is used for positional tracking, then measurement precision is maintained, but the system becomes restrictive when the machine needs to be moved frequently
Solution Approach 1:
The system transitions from a static reference frame to a dynamic one by making the reference frame movable with the machine. The reference frame is now attached to or moves with the machine base, allowing the machine to be repositioned freely while maintaining continuous positional tracking through the multi-axis assembly and angular encoders that follow the machine's movement.
Solution Approach 2:
The multi-axis assembly with two coupled articulated arms acts as an intermediary between the machine base and the fixed frame of reference. This intermediary structure, equipped with angular encoders, continuously tracks the machine's position and orientation changes, enabling both mobility and precise positioning measurement.
2Adaptability or versatility
If the machine base is moved frequently, then adaptability is improved, but repeated initialization of the identification process is required
Solution Approach 1:
The angular encoders on the multi-axis assembly continuously track the machine's position and orientation without interruption. As the machine moves, the encoders continuously measure the angles of the articulated arms, maintaining an unbroken chain of positional data that eliminates the need to stop and reinitialize the tracking system.
Solution Approach 2:
The system incorporates continuous feedback through angular encoders that measure the positions of all articulated joints in real-time. This feedback mechanism automatically updates the machine's position in the reference frame as it moves, eliminating the need for manual reinitialization after each relocation.
3Extent of automation
If a multi-axis assembly with angular encoders is used, then automatic displacement calculation is achieved, but device complexity increases
Solution Approach 1:
The system divides the tracking function into segmented components: two coupled articulated arms with multiple joints, each equipped with angular encoders. This segmentation allows each component to perform a specific measurement function while collectively achieving complete positional tracking, making the complex system manageable and modular.
Data Source
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AI summary
The device has a base (101) resting in a fixed point of a support wall (11) associated to a machine stand (12) and equipped with a support platform. Another base (102) rests in a fixed point of a support surface (21). A multi-axes assembly (110) has end bases (111, 117) coupled to articulated arms (113, 115). The end bases have respective main axes (X1, X7) each joined with a central axis of the concerned base when the end bases are in place. The assembly is equipped with angle coders measuring respective angles of rotation around each one of the axes of the assembly.