ASME B1.25 2019
$98.04
ASME B1.25 – 2019: Measurement Uncertainty Factors in the Calibration of Screw Thread Gages
| Published By | Publication Date | Number of Pages |
| ASME | 2019 | 17 |
This Standard has been prepared as a guide to the factors that contribute to uncertainty in the calibration of screw thread gaging devices. The reference section at the end of this Standard provides sources on how to compute uncertainty values. This Standard is intended to provide the following: (a) an explanation of measurement uncertainty and the factors that contribute to it (b) characteristics of the equipment required for thread gage calibration (c) guidance in the application of measurement uncertainty (d) methods to resolve measurement disputes This standard supersedes, replaces, and renders obsolete the B1-1993 Technical Report.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 5 | FOREWORD |
| 6 | ASME B1 COMMITTEE Screw Threads |
| 7 | CORRESPONDENCE WITH THE B1 COMMITTEE |
| 8 | 1 INTRODUCTION 2 SCOPE 3 DEFINITIONS 3.1 General Definitions 3.2 Dimensional Calibration Definitions |
| 9 | 4 CALIBRATION EQUIPMENT CONSIDERATIONS 4.1 Bench Micrometers and Similar Devices 4.2 High-Resolution Comparators |
| 10 | 4.3 Thread-Measuring Wires 4.4 Thread-Measuring Balls/Probes 4.5 Optical Comparators 4.6 Toolmakers’ Microscopes 4.7 Linear Pitch-Measuring Devices |
| 11 | 5 FACTORS TO BE INCLUDED IN UNCERTAINTY BUDGETS 5.1 Common Factors 5.2 Uncertainty Factors for Pitch (Groove) Diameter Calibration |
| 12 | 5.3 Uncertainty Factors for Major and Minor Diameter Calibrations 5.4 Uncertainty Factors for Angle Calibration 5.5 Uncertainty Factors for Linear Pitch Calibration 5.6 Uncertainty Factors for Functional Lead Calibration |
| 13 | 6 MEASUREMENT UNCERTAINTY EXAMPLES 7 DISPUTE RESOLUTION 7.1 Human Factors Figures Figure 6-1 One Measurement Showing Its Associated Range of Uncertainty Figure 6-2 Two Measurements With Differing Uncertainties |
| 14 | 7.2 Checks to Resolve Disputes 8 HOW MEASUREMENT UNCERTAINTY AFFECTS ACCEPTANCE 8.1 Acceptable Measurements That Ignore Uncertainty 8.2 Acceptable Measurements That Include Uncertainty Figure 6-3 Identical Measurements With Different Uncertainties Figure 6-4 Different Measurements With Different Uncertainties |
| 15 | 8.3 Measurements With Unacceptable Uncertainties 9 UNCERTAINTY/TOLERANCE RULES 10 REPORTING UNCERTAINTY Figure 8-1 Effect of Uncertainty on an At-Limit Measurement Figure 8.1-1 Acceptable Measurements That Ignore Uncertainty Figure 8.2-1 Acceptable Measurements That Include Uncertainty |
| 16 | 11 SPECIAL REQUIREMENTS 12 REFERENCES Figure 8.3-1 Two Measurements With Unacceptable Uncertainties |
