GB/T 39518-2020 in English

VALID

Geometrical product specifications (GPS)—Guidelines for the evaluation of coordinate measuring machine (CMM) test uncertainty for CMMs using single and multiple stylus contacting probing systems

Issued on:2020-11-19
Implemented on:2021-06-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $150.00
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Standard No:	GB/T 39518-2020
Document status:	VALID
Title in English:	Geometrical product specifications (GPS)—Guidelines for the evaluation of coordinate measuring machine (CMM) test uncertainty for CMMs using single and multiple stylus contacting probing systems
Title in Chinese:	产品几何技术规范（GPS）使用单探针和多探针接触式探测系统坐标测量机的检测不确定度评估指南
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-11-19
Implemented on:	2021-06-01
Professional Classification:	GB-National Standard
Related Keywords:	test uncertainty test ball temperature complete detection uncertainty evaluation framework test ball test environment temperature
Related Topics:	military probe probe Probe pyrene u6 probe multi-mode detection microprobe technology Methods using probe detection multi-probe Multiplex PCR and probes southern probe u6 probe function The role of the probe Test probe use Probe Probe Test System touch probe Probe Sampling System Probe series Novel Chemical Probe Technology dose probe Dual Probe System Probe series colocalization probe Various probes probe density Probe type Probe station probe probe flow Explore Probe Test Technology How to use the probe Probe application unit probe detection system probe measurement technique detect a single afm probe and Probe sheet thickness Pneumatic Probe Series Four-probe measurement system probe action Probes do not touch degree test probe uncertain formula Probe Measurement System How to use the electronic probe The purpose of the probe probe action How to use the probe Probe station probe monitoring probe Probe+Application+ probe multiplex pcr How much is the afm probe in grams multiplex pcr probe Probe use Probe products needle probe stepped probe Detector Index Uncertainty of detection dual probe technique probe sample rod Mechanical probe measurement Probe Sample Booklet low-dimensional probe positioning probe GBT39518 GB/T 39518-2020 Oxygen probe function Liquid phase system applicability Heavy duty contact detector detection range Uncertainty detection method Probe qualitative detection method Compass product execution standards are Probe detection concentration Light touch detection Probe Correlation Bed of Nails Test Probes

《GB/T 39518-2020产品几何技术规范（GPS）使用单探针和多探针接触式探测系统坐标测量机的检测不确定度评估指南》由TC240（全国产品几何技术规范标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Analysis of the core content of the standard

This standard establishes a complete detection uncertainty evaluation framework for coordinate measuring machines (CMM) equipped with contact probing systems, which mainly includes quantification methods for three major types of errors:

Error type	Evaluation formula	Key influencing factors
Form error (P_F)	u(P_F)=√[(F_SPHERE/2)²+u²(F_SPHERE)+(d_FIXTURING/2)²]	Detection ball shape, clamping displacement
Dimension error (P_S)	Compound formula includes thermal expansion term	Temperature, material expansion coefficient
Position error (P_L)	u(P_L)=√[(F_SPHERE/2)²+u²(F_SPHERE)+d_FIXTURING²]	Displacement caused by detection force

Key technical points

1. Detection ball selection specifications

The standard emphasizes that form error (sphericity) rather than roundness should be used as the evaluation basis. When using circularity approximation, an adjustment factor is required according to the number of measurement tracks:

3 orthogonal great circles: adjustment factor 1.25
5 specifically distributed great circles: adjustment factor 1.1
Single great circle: prohibited (risk of underestimation of error)

2. Fixture error control

The effect of fixture is quantified by the d_FIXTURING parameter. Two evaluation methods are recommended:

Use a displacement sensor to directly measure the displacement caused by the detection force
Comparative tests are performed with different measurement forces

Implementation recommendations

Temperature compensation scheme

For high-precision measurements (such as aerospace component testing), it is recommended to:

Maintain the test environment temperature at 20℃±1℃
Use a low expansion material test ball with α≤1.5×10^-6/K
Real-time monitoring of the test ball temperature and correction

Establishment of acceptance criteria

When the shape error of the test ball is close to the allowable error limit, it is recommended to:

Negotiate special acceptance rules with reference to GB/T 18779.6
Use the Monte Carlo method for uncertainty simulation

More samples: GB 50021-2001(2009) GB 18306-2015 JGJ 94-2008

Sample only — not a preview of GB/T 39518-2020

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