Screw Thread Inspection System Multi-Axis Measurement
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Solution Overview
Problem
Existing screw thread inspection systems are limited in their ability to measure dimensions accurately across multiple locations on wedge thread systems, relying on manual measurements at a single 'sweet spot' and failing to detect errors in thread lead or taper, which can result in incomplete assessment of dimensional accuracy.
Innovation Solution
A digital screw thread inspection system that measures along the Z-axis at various positions between 0° and 360°, calculates groove and root widths based on stab and load flank measurements, and reports errors relative to design parameters, capable of wireless data transmission and storage, and provides a graphical representation of thread system parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurements are taken at a single 'sweet spot' location, then the inspection process is simple and quick, but the measurement accuracy and completeness are insufficient as errors in thread lead or taper cannot be detected
Solution Approach 1:
The inspection system divides the thread measurement into multiple discrete locations along the thread length and circumferential positions (0° to 360°). Instead of a single measurement, the system segments the thread into multiple measurement points including the sweet spot and additional locations, allowing comprehensive detection of lead and taper errors while maintaining manageable inspection complexity through systematic data collection at each segment
Solution Approach 2:
The system transitions from single-point measurement to multi-dimensional measurement by adding circumferential positioning (0° to 360°) and axial position variations. This dimensional expansion allows the inspection system to detect three-dimensional thread errors including lead deviations and taper variations that cannot be identified through conventional single-location measurement alone
2Reliability
If multiple measurement locations are inspected, then comprehensive thread accuracy is achieved, but the inspection time and operational complexity increase
Solution Approach 1:
The inspection system implements continuous measurement capability by rotating the thread or measurement probe to capture data at multiple circumferential positions (0° to 360°) without interrupting the inspection process. This continuous action allows comprehensive coverage of all thread locations including multiple sweet spots and intermediate positions, ensuring complete detection of thread errors while maintaining efficient inspection flow
Solution Approach 2:
The system replaces manual repositioning and repeated measurement operations with automated mechanical rotation and electronic data capture. The automated rotation mechanism systematically positions the measurement probe at multiple locations and angles, eliminating the need for manual intervention at each measurement point and significantly reducing total inspection time while maintaining comprehensive coverage
3Measurement precision
If comprehensive multi-location measurements are performed, then complete thread system accuracy is assessed, but the data processing and reporting complexity increases
Solution Approach 1:
The inspection system implements automated feedback processing where measurement data from multiple locations is immediately compared against specified tolerances. The system provides real-time feedback on thread lead and taper accuracy, automatically identifying deviations and generating pass/fail determinations. This feedback mechanism simplifies data processing by systematically organizing multi-location measurements and providing immediate interpretation of results
Solution Approach 2:
The system creates digital copies and representations of the thread geometry from physical measurements taken at multiple locations. These digital models include calculated parameters such as thread lead, taper, and dimensional deviations that are derived from the raw measurement data. By working with these calculated copies rather than raw measurements, the system simplifies analysis and reporting while maintaining complete traceability to the original multi-location measurement data
Data Source
AI summary
A screw thread measurement system and methods may comprise a frame having a reference surface, a carrier coupled to the frame and configured to translate relative to the frame, a dimension measurement system coupled to the carrier and having a thread contact element configured to translate relative to the frame and orthogonally the translation axis of the carrier. The dimension measurement system configured to determine thread dimensions relative to the frame reference surface.