Coordinate Measuring Machine Probe Scanning Speed Optimization
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Solution Overview
Problem
Coordinate measuring machines face challenges in minimizing measuring errors due to varying maximum speed magnitudes across different degrees of freedom during scanning, leading to inefficiencies and potential damage from speed changes.
Innovation Solution
A method is developed to determine the maximum permissible scanning speed by analyzing the scanning path and identifying extreme points, allowing for a constant scanning speed that respects the maximum speed limits of each degree of freedom, which can be adjusted to maintain a speed reserve for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning speed is increased to improve productivity, then the measuring period is shortened, but speed changes cause vibrations that produce measuring errors
Solution Approach 1:
The patent applies preliminary action by calculating the maximum scanning speed in advance based on the scanning path geometry and machine characteristics before actual scanning begins. This pre-calculated speed limit ensures that when scanning occurs, the probe element moves at a constant speed that prevents vibrations and measuring errors, while still maximizing productivity within safety constraints.
Solution Approach 2:
The patent implements dynamics by adapting the scanning speed to the specific scanning path configuration. Rather than using a fixed speed, the system dynamically determines the optimal constant scanning speed based on the relationship between the scanning path and the coordinate measuring machine's degrees of freedom, allowing the highest possible speed that maintains measurement precision.
2Loss of time
If the scanning speed varies to complete scanning faster, then productivity improves, but accelerations and decelerations cause vibrations leading to measuring errors
Solution Approach 1:
The system performs preliminary calculation of the optimal constant scanning speed before the scanning operation begins. This pre-determined speed allows the probe element to traverse the scanning path at maximum constant speed without accelerations or decelerations, eliminating vibrations while minimizing the measuring period.
Solution Approach 2:
The patent changes the speed parameter from a variable profile (with accelerations and decelerations) to a constant value optimized for the specific scanning path. This parameter change eliminates the harmful dynamic effects of speed variations while maintaining high scanning efficiency.
3Productivity
If the scanning speed is increased beyond certain limits, then productivity improves, but the maximum speed magnitudes for individual degrees of freedom are exceeded causing potential damage
Solution Approach 1:
The patent applies preliminary action by pre-calculating the maximum permissible scanning speed based on the scanning path geometry and the maximum speed magnitudes of individual degrees of freedom before scanning begins. This ensures that the probe element never exceeds safe speed limits for any degree of freedom during the scanning operation.
Solution Approach 2:
The system uses an intermediary calculation step that translates the maximum speed limits of individual degrees of freedom into a single maximum scanning speed value for the scanning path. This intermediary computation ensures that the scanning speed respects all safety constraints while maximizing productivity.
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 approach enables faster scanning while minimizing errors and maintaining safety, optimizing the scanning process for repeated measurements of identical work pieces in mass production by determining the highest possible scanning speed for a given scanning path configuration.
Implementation Method 1
the deflection gives rise to a restoring force that ensures the mechanical contact between the sphere and the object
Data Source
AI summary
A method for scanning a work piece surface uses a coordinate measurement device. A probe element is brought into contact with the surface and the probe element is moved along the surface. The coordinate measurement device has a plurality of degrees of freedom, which are independent of one another, in the possible movements of the probe element with respect to the work piece. Maximum speeds which describe the maximum of a movement speed component of the probe element based on the respective degree of freedom are defined for the degrees of freedom. An estimated path on which the probe element is intended to move during scanning is predefined. The actual scanning path can differ from the estimated scanning path. A maximum scanning speed at which the estimated scanning path can be traveled with a constant speed of the probe element is determined.