Form Measuring Machine Automatic Correction Filter Calibration
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Solution Overview
Problem
Form measuring machines with scanning probes face measurement errors due to quadrant projection errors, which are not adequately corrected by existing correction filters, especially when the stylus is replaced, requiring manual input of correction factors.
Innovation Solution
A form measuring machine and method that automatically calculate and set a correction filter using a calibration reference piece, determining a correction matrix diagonal component and factor to correct measurement errors, allowing for accurate measurements without manual input of correction factors, even when the stylus is changed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a correction filter is used to correct measurement errors due to quadrant projection, then measurement precision is improved, but device complexity increases and manual setting is required when stylus is replaced
Solution Approach 1:
The system automatically calculates and sets correction factors by itself without requiring manual intervention. The correction filter setting section automatically computes correction factors based on measured data from the calibration reference piece, eliminating the need for operators to manually input correction factors when replacing styli.
Solution Approach 2:
The system performs preliminary calibration by measuring a calibration reference piece with known dimensions before actual measurements. This preliminary measurement establishes the correction factors that will be used for subsequent measurements, preparing the system in advance for accurate measurement.
2Measurement precision
If a correction filter is manually set with correction factors, then measurement precision is improved, but ease of operation deteriorates due to troublesome manual input required when stylus is replaced
Solution Approach 1:
The system automatically calculates and sets correction factors by itself without requiring manual intervention. The correction filter setting section automatically computes correction factors based on measured data from the calibration reference piece, eliminating the need for operators to manually input correction factors when replacing styli.
3Measurement precision
If correction factors are manually input for each stylus replacement, then measurement precision is maintained, but productivity decreases due to time-consuming setup procedures
Solution Approach 1:
The system automatically calculates and sets correction factors by itself without requiring manual intervention. The correction filter setting section automatically computes correction factors based on measured data from the calibration reference piece, eliminating the need for operators to manually input correction factors when replacing styli.
Solution Approach 2:
The system performs preliminary calibration by measuring a calibration reference piece with known dimensions before actual measurements. This preliminary measurement establishes the correction factors that will be used for subsequent measurements, preparing the system in advance for accurate measurement.
4Measurement precision
If a correction filter is set with appropriate correction factors, then measurement precision is improved, but ease of manufacture deteriorates due to difficulty in setting up for different stylus types
Solution Approach 1:
The system uses a universal calibration procedure that works with any stylus type. By measuring a calibration reference piece and automatically calculating correction factors, the system adapts to different stylus configurations without requiring manual setup or reconfiguration, making the system universally applicable to various probe configurations.
Data Source
AI summary
A form measuring machine includes: a scanning probe including a stylus with a tip ball and a probe body attached with the stylus; a movable slider supporting the scanning probe; a scale detecting a slider displacement of the slider; a tip ball displacement detector detecting a tip ball displacement of the tip ball; and an arithmetic unit calculating a measurement value based on the slider displacement, the tip ball displacement and a correction filter and comprising a correction filter setting section that: calculates a correction matrix diagonal component from the slider displacement and the tip ball displacement detected by calibration of the scanning probe; and calculates a correction factor of the correction filter from the correction matrix diagonal component to set the correction filter.