GB/T 34880.2: Evolution and historical versions
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Test conditions for 5-axis simultaneous machining centers - Part 2: Testing of the accuracy for vertical machine
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GB/T 34880.2-2025
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| GB/T 34880.2-2017 | English | 1239 |
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Test conditions for the 5-axis simultaneous machining centers -- Part 2: Testing of the accuracy for vertical machine
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GB/T 34880.2-2017
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Standard similar to GB/T 34880.2-2025 GB/T 34880.3 GB/T 34880.1 GB/T 34880.3 Basic data | Standard ID | GB/T 34880.2-2025 (GB/T34880.2-2025) | | Description (Translated English) | Test conditions for 5-axis simultaneous machining centers - Part 2: Testing of the accuracy for vertical machine | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J54 | | Classification of International Standard | 25.040.10 | | Word Count Estimation | 118,189 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2026-02-01 | | Older Standard (superseded by this standard) | GB/T 34880.2-2017 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 34880.2-2025: Test conditions for 5-axis simultaneous machining centers - Part 2: Testing of the accuracy for vertical machine
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ICS 25.040.10
CCSJ54
National Standard of the People's Republic of China
Replaces GB/T 34880.2-2017
Five-axis machining center inspection conditions
Part 2.Accuracy testing of vertical machine tools
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 General 1
4.1 Units of measurement 1
4.2 Implementation Standard 2
4.3 Inspection sequence 2
4.4 Inspection Item 2
4.5 Inspection Tools 2
4.6 Tool Center Point Following Function (RTCP) Accuracy Test 2
4.7 Type of test piece 2
4.8 Working accuracy inspection 3
4.9 Software Compensation 3
4.10 Position of non-test axis 3
4.11 Simplified Figure 3
4.12 Pallet 3
4.13 Inspection Environmental Conditions 3
4.14 Machine tool structure and motion axis naming 3
4.15 Mark 4
4.16 Minimum tolerance 4
5 Geometric accuracy inspection 6
5.1 Straightness Error of Linear Axis Motion 6
5.2 Angular Error in Linear Axis Motion 9
5.3 Perpendicularity Error Between Two Linear Axis Motions 12
5.4 Spindle Error 15
5.5 Flatness error of work table or pallet 20
6 Positioning accuracy and repeatability test of CNC axis 21
6.1 Positioning Accuracy and Repeatability of Linear Axis 21
6.2 Positioning accuracy and repeatability of the rotary axis 23
7 Working accuracy inspection 24
Appendix A (Normative) Additional Geometric Accuracy Test for AC Swing Rotary Table Machine Tools 40
Appendix B (Normative) Additional Geometric Accuracy Test for BC Swinging Rotary Table Machine Tools 69
Appendix C (Normative) Additional Geometric Accuracy Test for Swinging Spindle Head Machine Tools 96
Appendix D (Normative) Additional Geometric Accuracy Test for Rotary Swinging Spindle Head Machine Tools 103
Figure 1 Typical structure of five-axis linkage vertical machining center Figure 5
Figure 2 Specimen M1-80 (P grade) 24
Figure 3 Specimen M1-160 (P grade) 25
Figure 4 Specimen M1-320 (P grade) 26
Figure 5 Specimen M1-80 blank 27
Figure 6 Specimen M1-160 blank 27
Figure 7 Specimen M1-320 blank 28
Figure 8 Specimen M3 installation 32
Figure 9 Specimen M3 (P grade) 32
Figure 10 Specimen M4-80 (P grade) 34
Figure 11 Specimen M4-160 (P grade) 35
Figure 12 Specimen M4-320 (P grade) 35
Figure 13 Test piece M4 blank 36
Table 1 Type of test piece 2
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is part 2 of GB/T 34880 "Test conditions for five-axis machining centers". GB/T 34880 has published the following
part.
--- Part 1.Accuracy inspection of horizontal machine tools;
--- Part 2.Vertical machine tool accuracy inspection;
--- Part 3.Technical conditions.
This document replaces GB/T 34880.2-2017 "Test conditions for five-axis machining centers Part 2.Precision test conditions for vertical machine tools"
Compared with GB/T 34880.2-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The requirements of the implementation standard have been changed (see 4.2, 4.2 of the.2017 edition);
b) Changed the requirements for inspection tools (see 4.5, 4.5 of the.2017 edition);
c) Added the requirements for tool center point following function (RTCP) accuracy inspection (see 4.6);
d) The requirements for the type of test piece have been changed (see 4.7, 4.6 of the 2027 edition);
e) Changed the requirements for software compensation (see 4.9, 4.10 of the.2017 edition);
f) Added the position of non-test axis (see 4.10);
g) Changed the requirements for schematic drawings (see 4.11, 4.8 of the.2017 edition);
h) Changed the requirements for pallets (see 4.12, 4.9 of the.2017 edition);
i) Added requirements for inspection environmental conditions (see 4.13);
j) The minimum tolerance requirements have been changed (see 4.16, 4.13 of the.2017 edition);
k) Changed the straightness error inspection requirements for X-axis, Y-axis and Z-axis motion (see G1 to G3 in 5.1,.2017 edition).
G1~G3);
l) Changed the angular error inspection requirements for X-axis, Y-axis and Z-axis motion (see G4~G6 in 5.2,.2017 edition).
G4~G6);
m) Changed the relationship between Z axis movement and X axis movement, Z axis movement and Y axis movement, Y axis movement and X axis movement
Verticality error inspection requirements between (see G7 to G9 in 5.3, G7 to G9 in the.2017 edition);
n) Changed the spindle's axial error motion, the spindle taper's radial error motion, and the parallelism between the spindle axis and the Z axis motion
Error, perpendicularity error between spindle axis and X axis movement, perpendicularity error between spindle axis and Y axis movement
Requirements (see G10~G14 in 5.4, G10~G14 in the.2017 edition);
o) Changed the flatness error inspection requirements for the worktable (see G15 in 5.5, G15 in the.2017 edition);
p) Deleted the parallelism between the worktable and the X-axis and Y-axis motion, the runout between the worktable center hole and the worktable, and the worktable rotation.
Inspection requirements for the intersection and equidistance between the axis and the positioning datum (see G16 to G20 in the.2017 edition);
q) The requirement for perpendicularity inspection between the axis of rotation and the linear motion has been deleted (see G21 to G23 in the.2017 edition);
r) The requirement for the perpendicularity test between the rotation axes has been deleted (see G24 of the.2017 edition);
s) The intersection inspection requirement between rotation axes has been deleted (see G25 of the.2017 edition);
t) Deleted the parallelism test requirement between the rotation axis and the linear motion (see G26 in the.2017 edition);
u) Changed the positioning accuracy and repeatability test requirements for linear and rotary axes (see P1 and P2 in Chapter 6,.2017).
Versions 6.1 and 6.2);
v) Changed the working accuracy inspection requirements (see Chapter 7, Chapter 7 of the.2017 edition);
w) Added additional geometric accuracy inspection requirements for AC swing rotary table machine tools (see Appendix A);
x) Added additional geometric accuracy inspection requirements for BC swing rotary table machine tools (see Appendix B);
y) The additional geometric accuracy inspection requirements for oscillating spindle head machine tools have been changed (see Appendix C, Appendix A of the.2017 edition);
z) The additional geometric accuracy inspection requirements for rotary and swinging spindle head machine tools have been changed (see Appendix D, Appendix B of the.2017 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Metal Cutting Machine Tools (SAC/TC22).
This document was drafted by. General Technology Group Machine Tool Engineering Research Institute Co., Ltd., General Technology Group Kunming Machine Tool Co., Ltd.,
Shenyang Machine Tool Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute, Wuhan Heavy Machine Tool Group Co., Ltd., Kede CNC Co., Ltd.
Co., Ltd., National Machine Tool Quality Supervision and Inspection Center, Sichuan Pushiningjiang Machine Tool Co., Ltd., and Zhejiang Keda Machine Tool Co., Ltd.
The main drafters of this document are. Xue Ruijuan, Wang Jing, Guo Guoqiang, He Chunshu, Chen Hongjun, Li Chengyong, Yu Chunping, Chen Yanyan, Tan Zhi, Zhang Wei,
Huang Zuguang, Xu Haoli, Chen Wei, Zhang Ligang, Cai Minghui, Miao Dan, Zhou Zhigao, Wang Xiao, Jiang Erbiao
This document was first published in.2017 and this is the first revision.
introduction
The five-axis machining center has the advantages of processing complex surfaces, improving processing accuracy and efficiency, and its precision performance directly affects the product
Quality and processing capabilities. With the advancement of technology and the improvement of processing technology, the performance of five-axis linkage machining centers is also constantly improving. In order to meet our
This document has been revised to reflect the demand for technological advancement of five-axis machining centers driven by the high-end development of China's machine tools and the transformation and upgrading of its manufacturing industry.
GB/T 34880 consists of three parts.
--- Part 1.Horizontal machine tool precision inspection. The purpose is to establish the inspection requirements for the factory inspection of five-axis horizontal machining centers.
Projects and requirements.
--- Part 2.Vertical machine tool precision inspection. The purpose is to establish the inspection requirements for the five-axis linkage vertical machining center during factory inspection.
Projects and requirements.
--- Part 3.Technical conditions. The purpose is to establish the test to ensure the performance and quality of the five-axis linkage machining center during the manufacturing process
Projects and corresponding requirements.
This document is the second part of GB/T 34880, which mainly regulates the geometric accuracy, positioning accuracy and weight of five-axis vertical machining centers.
The inspection requirements, inspection methods and corresponding tolerances of positioning accuracy and working accuracy can be used for five-axis joint machining of ordinary and precision grades.
Provide basis and guidance for the design, manufacture, inspection and acceptance of automatic machining centers.
Five-axis machining center inspection conditions
Part 2.Accuracy testing of vertical machine tools
1 Scope
This document specifies the geometric accuracy, positioning accuracy and repeat positioning accuracy of the CNC axis, and working accuracy of the five-axis linkage vertical machining center.
Inspection requirements, inspection methods and corresponding tolerances.
This document is applicable to ordinary (P-level) and precision (M-level) five-axis linkage vertical machining centers with linear axis travel up to.2000mm
(hereinafter referred to as machine tools) design, manufacture, inspection and acceptance.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 17421.1-2023 General principles for inspection of machine tools Part 1.Geometric accuracy of machine tools under no-load or quasi-static conditions
GB/T 17421.2-2023 General rules for inspection of machine tools Part 2.Determination of positioning accuracy and repeatability of CNC axes
GB/T 17421.7-2016 General Rules for Inspection of Machine Tools Part 7.Geometric Accuracy of Rotary Axis
GB/T 19660-2005 Industrial automation systems and integrated machine tool numerical control coordinate systems and motion nomenclature
GB/T 25379.1-2010 General components for machine tools - Workpiece pallets - Part 1.Workpiece pallets with nominal dimensions up to 800 mm
Row pallet
GB/T 25379.2-2010 General machine tool components - Workpiece pallets - Part 2.Workpieces with nominal dimensions greater than 800 mm
Traveling pallet
GB/T 39953-2021 RTCP precision test for five-axis machining centers
GB/T 39967-2021 Accuracy test of S-shaped test pieces for five-axis machining centers
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
It has at least five CNC axes, including three linear axes (X, Y, Z) and two rotary axes (A, B, C in any combination), which can realize
A vertical machining center with five axes simultaneously participating in interpolation motion.
4 General
4.1 Units of measurement
All linear dimensions, errors and corresponding tolerances in this document are in millimeters (mm); angular dimensions are in degrees (°);
The error and the corresponding tolerance are expressed as a ratio, but in some cases, they can be expressed in microradians (μrad) or arc seconds (″). The conversion relationship is as follows.
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