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GB/Z 18620.5-2025Code of inspection practice - Part 5: Recommendations relative to evaluation of gear measuring instruments (English PDF)

检验实施规范第5部分：齿轮测量仪器评价

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 3, 2025

Implementation date

December 3, 2025

Scope

GB/Z 18620.5-2025 is the English-translated version of 检验实施规范第5部分：齿轮测量仪器评价.

GB/Z 18620.5-2025 is the Chinese standard "Code of inspection practice - Part 5: Recommendations relative to evaluation of gear measuring instruments". Its scope clause reads: This document provides further support information and examples for using ISO 18653, offering guidance on gear involute curves, helical curves, pitch, and radial direction.

Evaluation and calibration procedures for runout and tooth thickness measurement processes. This document describes methods for assessing and aligning instrument units such as the top, guide rails, and probe system, and also provides guidelines for establishing a suitable environment.

Recommendations for statistical data evaluation procedures. This document also covers the application of gear templates in uncertainty assessment during U95 measurements.

This document provides a method for serving the measurement process... Guidelines for product gear inspection, including applicability and recommended limits for U95 uncertainty based on the precision tolerance of the gears in the product to be inspected.

Many of the recommendations in this document can also be applied to the measurement of worms, worm gears, bevel gears, and gear cutting tools.

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Document preview — GB/Z 18620.5-2025

National Standard of the People's Republic of China

ICS: 21.200
Classification: J 17

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1.Scope
2 Normative References
3.Terms and Definitions
4.Equipment Environment
4.1 Environment
4.2 The Influence of Temperature on Gears and Templates
5.Measurement System
5.1 Evaluation Procedure for Generating Measuring Instruments
5.2 Evaluation Procedure for CMM-type Measuring Instruments
5.3 Measurement System
5.4 Filtering
5.5 Assessment of Uncertainty
6 Sample
6.1 Installation Standard
6.2 Recommendations for Code Templates
6.3 Inspection of the modified base circle involute template
6.4 Non-involute templates. Pin (cylindrical), Plane (toothed), and Ball (spherical) templates
6.5 Spiral Pattern Sample Inspection
6.6 Correction of Eccentric Tooth Pitch Template Inspection
7.Uncertainty Assessment Guidelines
7.1 Uncertainty Assessment Method
7.2 Calculation of Measurement Uncertainty for U95
7.3 Measurement Parameters
8 Measurement Procedure
8.1 Traceability
8.2 Operating Conditions
8.3 Measurement
8.4 Calibration Procedure
9.Guidelines for assessing measurement uncertainty using the comparison method
9.1 Example A of Direct Comparison Method
9.2 Comparative Method. Extending the Application to the Influence of Workpiece Characteristics
9.3 Comparison method, extended to address the influence of workpiece characteristics and geometric similarity
10 Statistical Process Control
10.1 Definition
10.2 Constructing X and MR Figures
10.3 Criteria for Data Out of Control
11.Applicability of the instrument
11.1 Limitations of Measurement Uncertainty
11.2 Sources of Measurement Uncertainty
11.3 Reducing Measurement Uncertainty
12.Correlation of the measurement process (instrument)
12.1 Basis of Comparison
12.2 Correlation of Measurements
Appendix A (Informative) The Effect of Temperature on Gears and Templates
Appendix B (Informative) Inspection of Modified Involute, Helix, and Tooth Pitch Templates
Appendix C (Informative). Detailed Explanation of Non-Involute Pins, Balls, and Flat Templates
References

1 Scope

This document provides further support information and examples for using ISO 18653, offering guidance on gear involute curves, helical curves, pitch, and radial direction.

Evaluation and calibration procedures for runout and tooth thickness measurement processes.

This document describes methods for assessing and aligning instrument units such as the top, guide rails, and probe system, and also provides guidelines for establishing a suitable environment.

Recommendations for statistical data evaluation procedures.

This document also covers the application of gear templates in uncertainty assessment during U95 measurements. This document provides a method for serving the measurement process...

Guidelines for product gear inspection, including applicability and recommended limits for U95 uncertainty based on the precision tolerance of the gears in the product to be inspected.

Many of the recommendations in this document can also be applied to the measurement of worms, worm gears, bevel gears, and gear cutting tools.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

Note. GB/T 3374.1-2010 Gears - Terminology and Definitions - Part 1.Geometric Definitions (ISO 1122-1.1998, IDT)

ISO 1328-1 Cylindrical gears - ISO tooth surface tolerance classification system - Part 1.Definition and permissible values of tooth surface deviations (Cylindrical)

Note. GB/T 10095.1-2022 Cylindrical gears - ISO tooth surface tolerance classification system - Part 1.Definition and permissible values of tooth surface deviations (ISO 1328-1.

2013, IDT)

ISO 1328-2 Cylindrical gears - ISO tooth surface tolerance classification system - Part 2.Definition and permissible values of radial composite deviation (Cylin-

Note. GB/T 10095.2-2023 Cylindrical gears - ISO tooth surface tolerance classification system - Part 2.Definition and permissible values of radial composite deviation (ISO 1328-2.

2020, IDT).

Note. GB /Z 18620.1-2008 Standard for Inspection of Cylindrical Gears - Part 1.Inspection of Tooth Surfaces on the Same Side (ISO /T R10064-1.1992)

IDT).

ISO /T R10064-2 Standard for Inspection of Cylindrical Gears - Part 2.Combined Radial Deviation, Radial Runout, Tooth Thickness and Backlash

Note. GB /Z 18620.2-2008 Standard for Inspection of Cylindrical Gears Part 2.Inspection of Radial Composite Deviation, Radial Runout, Tooth Thickness and Backlash (ISO /T R10064-2.1996, IDT)

ISO /T R10064-3 Standard for Inspection of Cylindrical Gears - Part 3.Inspection of Gear Blanks, Center Distance of Shafts and Parallelism of Shafts […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 78 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 1328-1 · ISO 1328-2 · ISO/TR 10064-2 · ISO/TR 10064-3

Similar standards

GB/T 10224-2025|GB/T 10225-2025|GB/T 10227-2025|GB/T 11366-2025|GB/T 12370-2025|GB/T 12371-2025

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