GB/T 21948.1-2008 English PDF

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GB/T 21948.1-2008: Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21948.1-2008	579	Add to Cart	5 days	Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle	Valid

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Basic data

Standard ID: GB/T 21948.1-2008 (GB/T21948.1-2008)
Description (Translated English): Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J54
Classification of International Standard: 25.080.20
Word Count Estimation: 25,285
Date of Issue: 2008-06-03
Date of Implementation: 2009-01-01
Quoted Standard: GB/T 17421.1-1998; GB/T 17421.2-2000; GB/T 19660-2005
Regulation (derived from): National Standard Approval Announcement 2008 No.9 (Total No.122)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the CNC horizontal milling machine geometric accuracy test, requirements and test methods positioning accuracy and precision inspection work. This section applies to the work surface width of 200mm ~ 500mm general purpose CNC horizontal milling machine (including CNC universal milling machine).

GB/T 21948.1-2008: Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test conditions for CNC milling machines with table of variable height Testing of accuracy Part 1. Machines with horizontal spindle ICS 25.080.20 J54 National Standards of People's Republic of China Test conditions for CNC milling machine accuracy test Part 1. Horizontal Milling Machine Posted 2008-06-03 2009-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 General requirements 1 3.1 Units of measurement 1 3.2 Installation Level 1 3.3 Test sequence 1 3.4 Test Item 1 3.5 inspection tool 1 3.6 Working accuracy test 2 3.7 Minimum tolerance value 2 3.8 axis and the direction of movement named 2 Geometric tests 2 4 4.1 axis motion 2 4.2 table 4 4.3 spindle 9 4.4 spindle support 14 5 positioning accuracy test 16 6 18 accuracy test work

Foreword

GB/T 21948 "Test conditions for CNC milling machine accuracy test" is divided into two parts. --- Part 1. Horizontal milling machine; --- Part 2. Vertical Milling Machine. This section GB/T 21948 Part 1. This part is proposed by China Machinery Industry Federation. This part of the National Metal Cutting Machine Standardization Technical Committee (SAC/TC22) centralized. This section is drafted. Zigong Changzheng Machine Tool Co., Ltd., Beijing First Machine Tool Plant. The main drafters of this section. Wang Xiaohui, Hu Ruilin, Xu Bank of China. Test conditions for CNC milling machine accuracy test Part 1. Horizontal Milling Machine

1 Scope

This section GB/T 21948 specifies the CNC horizontal milling machine geometric accuracy testing, inspection and positioning accuracy and working accuracy inspection Requirements and methods of test. This section applies to the work surface width of 200mm ~ 500mm general purpose CNC horizontal milling machine (including CNC universal liters Lower milling machine).

2 Normative references

The following documents contain provisions which, through reference GB/T 21948 in this section constitute provisions of this section. For dated references, All subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encourage an agreement under this section Parties to study the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 17421.1-1998 Test code for machine tools - Part 1. under no-load or finishing conditions Geometric accuracy of machines (eqv ISO 230-1.1996) GB/T 17421.2-2000 Test code for machine tools - Part 2. CNC axis positioning accuracy and repeatability of determination (Eqv ISO 230-2.1997) GB/T 19660-2005 Industrial automation systems and integration - Numerical control of machines and motion coordinate system named (ISO 841. 2001, IDT)

3 General requirements

3.1 Units of measurement This section all linear dimensions are in millimeters (mm) represents; angle deviation is mainly used as a ratio; in some cases for clarity Also used microradians (μrad) or arcsec ( ") indicates its conversion relation formula below. 0.01/1000 = 10 × 10-6 = 10μrad≈2 " 3.2 Installation level When using this section shall GB/T 17421.1-1998, especially air transport machine testing before installation, spindles and other moving parts Turn heat up, measurement and inspection tools recommended accuracy. According to GB/T 17421.1-1998 adjust the machine to install the 3.1 level. The table in the middle position of travel. Workbench Place the central level meter. Levels in both vertical and horizontal readings are not more than 0.04/1000. 3.3 Test order Inspection order under this Part may not represent the actual test sequence. In order to make an inspection tool assembly and disassembly and inspection of convenience, can be arbitrary Order of inspection. 3.4 Test Project When the test machine, according to the structural characteristics must not test all of the items in this section. When testing requirements for acceptance purposes, can Select the manufacturer to obtain the consent of interested test items by the user, but these test items must be clearly stated at the time of ordering the machine. 3.5 inspection tool Test tools provided in this section is only an example, you can use the same amount of instructions or have other tools to test at least the same accuracy. Indicators should have a 0.001mm or higher resolution. ......

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