GB/T 24635.1-2020Geometrical product specifications (GPS). Coordinate measuring machines (CMM): Technique for determining the uncertainty of measurement - Part 1: Overview and metrological characteristics (English PDF)

1 Scope

This part of GB/T 24635 is an overview of the GB/T 24635 series, which specifies the metrological characteristics and specific tasks of coordinate measuring machines (CMM):

The source of uncertainty for the service, gives the relationship between the GB/T 16857 series of standards and the GB/T 24635 series of standards (see Appendix A):

This section is suitable for evaluating the measurement uncertainty of a specific task when using a coordinate measuring machine:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 16857:1 Technical Specification for Product Geometrical Quantities (GPS) Acceptance Testing and Re-inspection Testing of Coordinate Measuring Machines Part 1: Words

Exchange (GB/T 16857:1-2002, eqvISO 10360-1:2000)

GB/T 18779:1 Technical Specification for Product Geometrical Quantity (GPS) Measurement Inspection of Workpieces and Measuring Equipment Part 1: Inspection According to Specifications

Rules for determining qualified or unqualified inspection (GB/T 18779:1-2002, eqvISO 14253-1:1998)

GB/T 18779:2-2004 Product Geometrical Technical Specifications (GPS) Measurement and Inspection of Workpieces and Measuring Equipment Part 2: Measurement

Guidelines for the Evaluation of Uncertainty of GPS Measurement in Calibration of Measuring Equipment and Product Inspection (ISO /T S14253-2:1999, IDT)

GB/T 24634 Product Geometric Technical Specification (GPS) General concepts and requirements for GPS measuring equipment (GB/T 24634-2009,

ISO 14978:2006, IDT)

JJF1001 General measurement terms and definitions

JJF1059:1 Evaluation and expression of measurement uncertainty

3 Terms and definitions

GB/T 16857:1, GB/T 18779:1, GB/T 18779:2, GB/T 24634, JJF1059:1, JJF1001 and the following

Terms and definitions apply to this document:

3:1

Task-specificmeasurementuncertainty

The expanded uncertainty of a specific measurement result (including factor k=2) evaluated according to JJF1059:1:

Note 1: The measurement uncertainty of a specific task includes all sources of uncertainty related to the details of the measurement process, including coordinate measuring machines, detection systems, and sampling

Strategy, workpiece location and orientation, fixtures, contaminants, and ambient temperature:

Note 2: Generally speaking, different parameters of features have different uncertainties, for example: the center of a circle, the uncertainty of its X and Y coordinates may be different:

Note 3: Changing the amount of influence, such as changing the position of the workpiece in the measurement area of the coordinate measuring machine, may cause a change in the measurement uncertainty of a specific task:

GB/T 23901.4 | GB/T 23901.5 | GB/T 23906 | GB/T 24635.3 | GB/T 24630.1 | GB/T 24635.4 | […]