GB/T 17421.2-2023 in English

VALID

Test code for machine tools—Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes

Issued on:2023-08-06
Implemented on:2024-03-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $640.00
$621.00

Standard No:	GB/T 17421.2-2023
Document status:	VALID
Title in English:	Test code for machine tools—Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes
Title in Chinese:	机床检验通则第2部分：数控轴线的定位精度和重复定位精度的确定
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2023-08-06
Implemented on:	2024-03-01
Superseding:	GB/T 17421.2-2016 Test code for machine tools-Part 2:Determination of accuracy and repeatability positioning numerically controlled axes
ICS Classification:	25.040.20-Numerically controlled machines
Chinese Classification:	J50-Machine tool in general
Professional Classification:	GB-National Standard
Related Keywords:	one-way/two-way positioning system error positioning error a=system accuracy parameter system system error temperature compensation error
Related Topics:	iso positioning accuracy Precision Repeatability Accuracy Repeat uncertainty how to identify duplicates Repeatability and Precision GB/T17421.2-2016 repeatability test repeatability imprecision repeatability of precision Precision and Repeatability speed accuracy colocalization coefficient axis Precision and Precision Repeatability GB/T17421.2-2000 Repeatability Repeatability gb t17421.2 Uncertainty unit gb/t17421.2 gb+t17421.2 Check repeatability Repeatability and Accuracy GB/T 17421.2-2016 Repeatability repeatability imprecision how many digits Repeatability and precision line accuracy Repeatability degree of colocalization Accuracy Precision Repeatability Repeatability Repeatability Accuracy Accurate to a few digits positioning accuracy GB/T 17421.2 GB/T 17421.2-2000 GB/T 17421.2-2016 Measurement accuracy and repeatability vdi3441 standard positioning accuracy iso230-2 standard repeated positioning accuracy GB/T17421.2—2000 Accurate quantification of organic matter Indoor positioning accuracy test High-precision positioning group Module repeat positioning accuracy measurement position Positioning repeatability detection method

《GB/T 17421.2-2023机床检验通则第2部分：数控轴线的定位精度和重复定位精度的确定》由TC22（全国金属切削机床标准化技术委员会）归口，主管部门为中国机械工业联合会。

Introduction

Analysis of the core content of the standard

Inspection items	2016 version	Main changes in the 2023 version
Definition of terms	23 items	9 new terms such as action point and sampling point
Environmental requirements	Temperature gradient is not specified	New minimum/maximum ambient temperature requirements
Measuring stroke	≤2000mm	Inspection specifications extended to axes above 4000mm

Key technical points

Positioning accuracy parameter system

The standard constructs a complete error evaluation system:

System error: including one-way/two-way positioning system error (E↑, E↓, E)
Random error: repeated positioning accuracy (R↑, R↓, R)
Comprehensive index: positioning error A=system error±2×random error

Measurement uncertainty assessment

Appendix A provides the quantification method of four types of uncertainty components:

Measuring device error (U_a)
Temperature compensation error (U_w)
Error in coefficient of thermal expansion (U_ε)
Environmental change error (U_eve)

Expanded uncertainty of a typical 1.75m axis under industrial conditions is U=15μm (k=2)

Implementation suggestions

Preparation before inspection

Thermal stabilization time of the machine tool ≥12 hours
Ambient temperature gradient ≤2℃/m
Verification of the validity period of calibration of the measuring device

Acceptance dispute handling

When the measurement result is close to the tolerance limit, you should:

Check whether the installation position of the temperature sensor meets the requirements of 4.1
Re-evaluate the contribution of each component of the measurement uncertainty
Perform a step cycle comparison test according to Appendix B

More samples: JGJ 94-2008 YD/T 3934-2021 NB/T 47013.2-2015

Sample only — not a preview of GB/T 17421.2-2023

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