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SAE J2666-2018: A Standardized Hose Gauge Evaluation Procedure
🔍 SAE J2666-2018 provides a standardized procedure for evaluating the capability of gauges used in non-hydraulic hose measurement. Developed by the SAE Non-Hydraulic Hose Committee, this standard enables users to compare equipment capability across different manufacturers and methods. The procedure is based on the methodologies used in SAE J1759 and J2605 and follows the AIAG Measurement Systems Analysis (MSA) manual.
Stabilized Standard: SAE J2666 has been declared stabilized, meaning it contains basic and stable technology. Users are responsible for verifying references and continued suitability of its technical requirements.
Key Requirements of the Procedure
The procedure outlines specific requirements for conducting a Gauge Repeatability and Reproducibility (GR&R) study. These parameters ensure consistency and comparability of results across different testing environments.
| Parameter | Requirement |
|---|---|
| Measurement Unit | Metric (millimeters) |
| Hose Types | Include a range: straight, curved, different materials |
| Dimensions | Inside diameter, outside diameter, wall thickness, variation, etc. |
| Operators | 3 |
| Test Locations | 3 |
| Gauges | 3 (one per location) |
| Part Sets | 3 sets of 10 samples each |
| Data Recording | Electronic or manual |
Parts are transferred between locations, and each test must clearly mark which hose end is used and the measurement depth. The study requires a detailed test script so that any trained operator can replicate the process. Previous or similar gauge studies should be referenced when available.
⚠️ Important: Metric measurement is mandatory. Always ensure that all recorded data uses millimeters to maintain consistency across studies.
Performing the GR&R Calculations
The standard prescribes the AIAG ANOVA method for GR&R analysis. Each test location calculates a separate GR&R using three operators and the same ten parts. The overall gauge capability is reported as the average GR&R across the three locations. Additionally, a composite GR&R is computed using only the first operator from each location. This composite is a more stringent measure because it includes any gauge offsets that may exist between the three test systems.
Engineering Design Insight: The composite GR&R calculation is particularly valuable for comparing gauges from different manufacturers. By isolating operator-induced variation and capturing system-to-system offsets, it provides a realistic assessment of how the measurement equipment will perform in production.
Frequently Asked Questions
1. What hose types should be included in the study?
The standard recommends including a representative range of parts, such as straight, curved, and different material hoses, to cover the expected variation in production.
2. How many operators and test locations are required?
The study must include exactly 3 operators, 3 test locations, and 3 gauges (one per location). Each location performs a full GR&R study with the 3 operators on the same 10 parts.
3. Can I use manual data recording methods?
Yes, the standard allows both electronic and manual recording of data, as long as the procedure is documented clearly and can be replicated by trained operators.
4. Why is the composite GR&R more stringent than the average GR&R?
The composite GR&R uses only the first operator’s results from each location, removing operator variation within a location but including gauge-to-gauge offsets. This simulates a scenario where different gauges are used at different times, making it a stricter capability check.
