CMM Environmental Sensor Integration for Thermal Expansion Compensation
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Solution Overview
Problem
Coordinate measuring machines (CMMs) face challenges in maintaining accuracy due to environmental fluctuations such as temperature, vibration, and humidity, which can lead to erroneous measurements as objects with thermal expansion coefficients change size, potentially causing parts to fail or pass specifications incorrectly.
Innovation Solution
Equipping CMMs with sensors for environmental and object condition monitoring, including temperature, vibration, humidity, and pressure sensors, to adjust measurements and generate alerts when conditions deviate from specified tolerances, ensuring accurate data collection by re-measuring or adjusting measurements based on real-time sensory data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CMM measures to the nearest micron or tens of microns, then measurement precision is improved, but measurement accuracy deteriorates due to thermal variations causing erroneous measurements
Solution Approach 1:
The system continuously monitors environmental conditions (temperature, humidity, vibration) during measurement and uses this feedback to dynamically adjust measurements or trigger re-measurements when conditions deviate from acceptable ranges, ensuring measurement accuracy is maintained despite environmental fluctuations
Solution Approach 2:
The system changes measurement parameters or re-measurement decisions based on environmental parameter changes. When temperature, humidity, or vibration exceed thresholds, the system adjusts by re-measuring the object or applying compensation based on the environmental data collected
2Reliability
If environmental monitoring sensors are added to CMM, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The system integrates multiple environmental monitoring functions (temperature, humidity, vibration sensing) into a unified control framework that manages all sensors and measurement operations through a single controller, reducing operational complexity despite adding multiple sensing capabilities
Solution Approach 2:
The system automatically monitors environmental conditions and self-adjusts measurement operations without external intervention. The controller autonomously decides when to re-measure or apply corrections based on sensor data, eliminating the need for manual environmental monitoring and adjustment
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 solution enhances measurement accuracy by accounting for environmental and object conditions, reducing errors and ensuring compliance with specifications by adjusting for thermal expansion and other environmental factors in real-time, thereby improving the reliability of CMM readings.
Implementation Method 1
a CMM may measure a metal object having a high coefficient of thermal expansion within a thermally changing environment
Implementation Method 2
sensing information includes information relating to at least one of temperature, vibration, humidity, pressure, light, and composition of fluid
Implementation Method 3
sensing information includes information relating to at least one of temperature, vibration, humidity, pressure, light, and composition of fluid
Data Source
AI summary
A method of measuring an object uses a coordinate measuring machine, which is positioned within an environment (e.g., a clean room). The method receives sensing information relating to the coordinate measuring machine, the environment, or both the coordinate measuring machine and the environment. Next, the method controls the coordinate measuring machine to perform, based on the sensing information, a specified mechanical action.