Rotary Table Calibration via Relative Coordinate Storage
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Solution Overview
Problem
The existing methods for setting and registering a rotary-table coordinate system in shape measuring apparatuses are time-consuming and labor-intensive, hindering measurement efficiency due to the need for frequent recalibration of the rotation center, especially when the coordinate measuring machine is turned on and off.
Innovation Solution
A control method that includes an origin-point relative-value registration step and a rotary-table origin-point re-registration step, where the rotation center of the rotary table is calculated relative to a main reference point, allowing for efficient recalibration by adding a relative coordinate value to the current reference point coordinates, thereby quickly recalibrating the rotary-table coordinate system without requiring extensive measurement of the rotation center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a master ball or gauge is used to measure the locus while the rotary table is rotated to obtain the rotation center, then the rotary-table coordinate system can be properly registered, but the process takes considerable time and labor
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relative coordinate values between the main reference point and the rotation center in a storage unit. These pre-computed values are then retrieved and applied during actual measurement operations, eliminating the need to perform time-consuming locus measurements each time the rotary table needs to be calibrated.
Solution Approach 2:
The patent creates a computational copy of the coordinate transformation relationship by storing the relative coordinate values as data. Instead of physically measuring the rotation center locus each time, the system uses the stored numerical representation of the spatial relationship between the main reference point and rotation center to quickly determine the current rotation center position.
2Measurement precision
If the rotary-table coordinate system is registered frequently to maintain accuracy after machine power on/off, then measurement accuracy is maintained, but measurement efficiency is reduced
Solution Approach 1:
The system performs self-service by automatically retrieving and applying the pre-stored relative coordinate values when the rotary table needs to be calibrated. The control unit automatically executes the coordinate transformation calculation using the stored data, eliminating the need for manual intervention and time-consuming measurement procedures, thus maintaining both accuracy and efficiency.
Solution Approach 2:
The relative coordinate values are pre-calculated and stored in advance, so that when calibration is needed, the system can immediately retrieve and apply these pre-computed values rather than performing new measurements. This preliminary preparation of calibration data enables rapid recalibration without sacrificing accuracy.
Data Source
AI summary
A main reference point PM is provided to a base portion of a shape measuring apparatus including a rotary table. An origin-point relative-value registration includes measuring a main reference point with a probe to acquire a coordinate value of the main reference point and registering as a calibration-reference-point coordinate value Pp, registering a rotation center point of the rotary table as a calibration-rotation-center coordinate value Rp, and calculating a relative coordinate value of the calibration-rotation-center coordinate value Rp with respect to the calibration-reference-point coordinate value Pp and registering as a rotary-table origin-point relative coordinate value ΔD1. A rotary-table origin-point re-registration step includes the steps of measuring the main reference point with the probe to acquire a coordinate value the main reference point and registering as a current-reference-point coordinate value Pc, and adding the rotary-table origin-point relative coordinate value ΔD1 to the current-reference-point coordinate value Pc to calculate a rotary-table origin-point current coordinate value Rc.