Articulating Arm Laser Scanner Mounting for Precision
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Solution Overview
Problem
Conventional coordinate measurement machines (CMMs) with laser scanners face inefficiencies due to generic mounts that place the laser scanner in non-optimal locations, leading to less accurate scanning performance.
Innovation Solution
An optical position acquisition member with a base plate that allows a laser and optical sensor to mount collinearly with the CMM measuring probe, and an articulated arm CMM with a rotatable laser scanner assembly that positions the laser and image sensor on opposite sides of the last axis of rotation, optimizing the scanner's placement for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a generic mount is used to allow easy removal and replacement of the laser scanner, then the adaptability and ease of operation are improved, but the laser scanner is placed in non-optimal locations resulting in reduced measurement precision
Solution Approach 1:
The coordinate acquisition member is divided into separate functional components: a base plate that mounts to the articulated arm, and a scanner mounting plate that holds the laser scanner. This segmentation allows the scanner to be positioned optimally on the mounting plate while maintaining the ability to easily remove and replace the scanner through the kinematic mounting interface.
Solution Approach 2:
A specialized mounting plate with kinematic mounting features serves as an intermediary between the generic arm interface and the laser scanner. This intermediary component provides both the ease of removal/replacement and the optimal positioning of the scanner, resolving the contradiction between adaptability and measurement precision.
2Ease of operation
If the laser scanner is mounted on a generic interface, then the ease of operation and adaptability are improved, but the various locations for mounting result in less accurate laser scanning performance
Solution Approach 1:
The mounting plate is designed with specific local features including a precisely positioned opening for the probe axis and optimized locations for the laser and optical sensor. These local quality enhancements ensure that while the overall mounting interface remains generic and easy to use, the critical scanning components are positioned in optimal locations for accurate measurement.
3Ease of manufacture
If the laser and optical sensor are positioned away from the probe axis, then the ease of manufacture and assembly are improved, but the measurement precision and accuracy are reduced
Solution Approach 1:
The base plate design integrates multiple functions: it provides the mounting interface for the articulated arm, positions the probe through a central opening, and simultaneously positions the laser and optical sensor in optimal locations. This multi-functional design achieves both ease of manufacture and high measurement precision through a unified structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the accuracy of laser scanning by minimizing errors associated with the last three axes of rotation and balances the weight of the coordinate acquisition member, reducing deflection and enhancing maneuverability while maintaining a compact design.
Implementation Method 1
an optical or laser scanner. In such applications the optical or laser scanner typically includes an optics system, a laser or light source, sensors and electronics
Data Source
AI summary
A coordinate measurement device comprises an articulated arm having a first end, a second end, and a plurality of jointed arm segments therebetween. Each arm segment defines at least one axis of rotation. A laser scanner assembly is coupled to the second end of the arm and is rotatable about a last axis of rotation of the articulated arm. The laser scanner assembly comprises a laser and an image sensor. The laser is positioned on an opposite side of the last axis of rotation from the image sensor.