1、BS 4311:2007Gauge blocks manufactured to imperial specification Specification, validation and accessoriesICS 17.040.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c)
2、BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007ISBN 978 0 580 53872 8The following BSI references relate to the work on this standard:Committee reference TDW/4Draft for comment 03/101273 DCPublication hi
3、storyPart 2 first published July 1977Part 2 second edition, February 1994Part 3 first published April 1993First published as BS 4311 (combined revision of Parts 2 and 3) August 2007Amendments issued since publicationAmd. no. Date Text affectedBS 4311:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA S
4、TANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 iBS 4311:2007ContentsForeword ii1 Scope 12 Normative references 13 Definitions 14 Nomenclature of faces 25 Basis of measurement, traceability, reference condition 26 General dimensions, material properties, marking 37 Metrological requi
5、rements 48 Calibration of gauge blocks 7AnnexesAnnex A (informative) Frequency of calibration 8Annex B (informative) Care of gauge blocks 8Annex C (informative) Wear in use and maintenance of gauge blocks 9Annex D (informative) Selecting grade of gauge blocks 10List of figuresFigure 1 Nomenclature o
6、f faces 2Figure 2 Perpendicularity deviation of side faces with a measuring face as a datum 6List of tablesTable 1 Cross-section 3Table 2 Dimensional stability 4Table 3 Flatness tolerances for new inch gauge blocks 5Table 4 Perpendicularity tolerance 6Table 5 Limit deviation, leof the length at any
7、point of the measuring face from nominal length and tolerance, for the variation in length 7Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iii, a blank page, pages 1 to 11 and a back cover.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:
8、02, Uncontrolled Copy, (c) BSIBS 4311:2007ii BSI 2007ForewordPublishing informationThis British Standard is published by BSI and came into effect on 31 August 2007. It was prepared by Technical Committee TDW/4, Technical product specification Methodology, presentation and verification under the dire
9、ction of the Consumer products and services business sector. TDW/4 has, within its scope, responsibility for “metrology and precision measurement” with resulting access to appropriate technical expertise. A list of organizations represented on this committee can be obtained on request to its secreta
10、ry.SupersessionThis British Standard supersedes BS 4311-2:1994 and BS 4311-3:1993, which are withdrawn.Information about this documentThis new version of BS 4311 has been prepared in response to a requirement for the ongoing support for gauge blocks manufactured to the imperial system, following the
11、 publication of BS EN ISO 3650:1999, which provides for gauge blocks manufactured to the metric system, and the consequent withdrawal of BS 4311-1:1993.Throughout this revision, the principles and practices specified in BS EN ISO 3650:1999 have been given precedence and have been cross-referenced wh
12、erever appropriate. The main function of this new version of BS 4311 is to provide for the application of the requirements of BS EN ISO 3650:1999 to the many gauge blocks manufactured to the imperial system, which remain in use and which will continue to be in use for the foreseeable future.The effe
13、cts of uncertainty of measurement continue to be taken into account in that the method of measurement is clearly stated for each grade and the line of traceability to internationally recognized, universal standards of length is established.As with BS EN ISO 3650:1999, and unlike the former BS 4311-1
14、:1993 and BS 4311-3:1993, this standard does not make any distinction between new and used gauge blocks. However, the fact that during use gauge blocks wear and consequently fall outside their original specification is still recognized. To preserve the required standards of accuracy during use, gaug
15、e blocks should be carefully maintained and regularly calibrated. Guidance on these aspects is provided in Annex A, Annex B, Annex C and Annex D. Because of their inclusion in this standard, the contents of these annexes relate specifically to gauge blocks manufactured to the imperial system, but it
16、 should be recognized that the principles and recommendations presented here, apply equally to gauge blocks manufactured to the metric system.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 iiiBS 4311:2007Presentational conventionsThe prov
17、isions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.A
18、 comma, rather than a full point, has been used as the decimal indicator throughout this British Standard in order to align it with the Geometrical Product Specifications listed in Clause 2. Care should be taken when using this publication in conjunction with other British Standards.Contractual and
19、legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12
20、/2007 03:02, Uncontrolled Copy, (c) BSIiv BSI 2007 This page deliberately left blankBS 4311:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 1BS 4311:20071 ScopeThis British Standard specifies the most important design and metrological
21、characteristics of gauge blocks with a rectangular cross-section and a nominal length ln of not more than 4 in.Limit deviations and tolerances are stated for the calibration grade K and for the grades 0, 1 and 2 for various measuring purposes.2 Normative referencesThe following referenced documents
22、are indispensable for the application of this document. For dated references, only the cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS EN ISO 1, Geometrical Product Specifications (GPS) Standard reference temperature for geom
23、etrical product specification and verificationBS EN ISO 3650:1999, Geometrical Product Specifications (GPS) Length standards Gauge blocksBS EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodBS EN ISO 14253-1, Geometrical Product Specifications (GPS) Inspection by measurement
24、 of workpieces and measuring equipment Part 1: Decision rules for proving conformance or non-conformance with specificationsBS ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out3 DefinitionsFor the purposes of this British
25、 Standard, the definitions given in BS EN ISO 3650 apply.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSIBS 4311:20072 BSI 20074 Nomenclature of facesThe nomenclature used to describe the faces of a gauge block shall be as identified in Figure 1.5 B
26、asis of measurement, traceability, reference conditionNOTE For the purposes of relating measurements made on gauge blocks manufactured to imperial specifications to the SI unit of length, the metre, the following conversion may be used: 1 in = 25,4 mm exactly. The abbreviated form of inch, as used i
27、n this document is “in”.5.1 Traceability of the length of a gauge blockThe measured length of a gauge block shall be traceable to national or international length standards if the measurement result can be related by an unbroken chain of comparison measurements, each with stated uncertainties, to a
28、gauge block which has been calibrated by interferometry using appropriate wavelength standards.Figure 1 Nomenclature of facesa) for nominal lengths ln= 0,19 inKeyABCDEFLeft hand measuring faceRight hand measuring faceUnmarked measuring faceMarked measuring faceSide facesMarked side faceNOTE For the
29、complete marking, see 6.3.CDEABF0,11Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 3BS 4311:20075.2 Reference temperature and standard pressureThe nominal length and the measured lengths of a gauge block shall apply at the reference tempe
30、rature of 20 C (see BS EN ISO 1) and the standard pressure 101 325 Pa = 1,013 25 bar.NOTE The effect on the length of a gauge block caused by deviations from the standard pressure can be ignored under normal atmospheric conditions.5.3 Reference orientation of gauge blocksThe length of a gauge block
31、up to and including 4 in nominal length refers to the vertical orientation with the measuring faces horizontal.6 General dimensions, material properties, marking6.1 General dimensionsThe nominal dimensions of the cross-section and their limit deviations shall be as given in Table 1.6.2 Material prop
32、erties6.2.1 MaterialGauge blocks shall be made of high grade steel or of other similarly wear-resistant material capable of being finished with surfaces that will wring readily, and which will be stable for length within the tolerances in Table 2.6.2.2 Coefficient of thermal expansionThe coefficient
33、 of thermal expansion of steel gauge blocks in the temperature range 10 C to 30 C shall be (11,5 1,0) 106K1.The coefficient of expansion with its estimated uncertainty of determination shall be supplied with steel grade K gauge blocks, and also for all gauge blocks of all grades made of materials ot
34、her than hardened steel.Table 1 Cross-sectionCross-section Nominal length inLength a mmLength b mmnominallimit deviation nominallimit deviation0 u lnu 0,19 3000,3090,050,200,19 lnu 4,0 35abLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSIBS 4311:2007
35、4 BSI 20076.2.3 HardnessThe measuring faces of steel gauge blocks shall have a Vickers hardness of not less than 800 HV 0,5 (see BS EN ISO 6507-1).6.2.4 Dimensional stabilityThe maximum permissible changes in length per year of gauge blocks shall be as stated in Table 2. They apply when the gauge bl
36、ocks are not exposed to exceptional temperature, vibrations, shocks, magnetic fields or mechanical forces6.3 MarkingEach gauge block shall be permanently marked with its nominal length in inches and shall be permanently and individually identifiable in characters not less than 1,5 mm high. Gauge blo
37、cks smaller than 0,19 in nominal length can be marked on a measuring face, but an area of 9 mm 12 mm at the centre of the measuring face and an area of 2,5 mm 2,5 mm in each of the four corners shall be left clear of any marking.If the grade is indicated on the gauge block, the following markings sh
38、all be used:a) calibration grade K: Kb) grade 0: 0c) grade 1: d) grade 2: =7 Metrological requirements7.1 GeneralEach gauge block shall conform to the requirements of its grade, as indicated below.Conformance to specifications shall be proved:a) in accordance with BS EN ISO 14253-1; orb) in accordan
39、ce with a prior agreement with the customer.The requirements of Table 3 and Table 4 shall apply to the measuring faces of the gauge block omitting a border zone with a maximum width of 0,8 mm as measured from the plane of the side faces. In this border zone the surface shall not lie above the plane
40、of the measuring face.Table 2 Dimensional stabilityGrade Maximum permissible change in length per yearK0 (0,8 in + 0,25 106 ln)12 (2 in + 0,5 106 ln)NOTE lnis expressed in inches.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 5BS 4311:200
41、7Grade K blocks shall comply with the tolerance tefor limit deviations from nominal length as grade 1. Very close tolerances for flatness and variation in length for grade K blocks shall be as given in Table 3 and Table 4. These gauge blocks are intended for calibrating other gauge blocks and shall
42、always be used in connection with a calibration certificate.Limit deviations for length and for variation in length applicable to all grades of gauges shall be as given in Table 5.7.2 Flatness tolerance, tf7.2.1 Gauge blocks with nominal lengths exceeding 0,1 inThe deviation fdfrom flatness of each
43、measuring face of a gauge block of nominal length greater than 0,1 in shall not exceed the appropriate tolerance in Table 3, whether the gauge block is wrung to an auxiliary plate or is in the unwrung state.7.2.2 Gauge blocks with nominal lengths up to 0,1 inThe deviation fdfrom flatness of each mea
44、suring face of a gauge block of nominal length up to 0,1 in shall not exceed the appropriate tolerance in Table 3 when the gauge block is wrung to an auxiliary plate with a thickness of not less than 11 mm.With the gauge block in the unwrung state, each measuring face shall be flat to within 150 in.
45、7.3 Measuring facesThe measuring faces of all gauge blocks shall wring readily.NOTE Fine scratches without burrs can be accepted when they do not impair the wringing property.The edges of the measuring faces shall be rounded to a radius not exceeding 0,3 mm or provided with a chamfer not exceeding 0
46、,3 mm. The transition between the chamfer and the measuring face shall be such that the wringing property of the measuring faces is not impaired.7.4 Side faces7.4.1 FlatnessThe side face shall have a flatness tolerance (see BS ISO 1101) of 0,001 5 in for nominal lengths up to 4 in.Table 3 Flatness t
47、olerances for new inch gauge blocksGrade ToleranceK20416210Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSIBS 4311:20076 BSI 20077.4.2 ParallelismThe deviation from parallelism (see BS ISO 1101) of a side face with the opposing side face as a datum
48、shall not exceed 0,003 in for nominal lengths up to 4 in.7.4.3 Perpendicularity7.4.3.1 The perpendicularity tolerance (see BS ISO 1101) of a side face with a measuring face as a datum shall be as given in Table 4 (see Figure 2).7.4.3.2 The angle between adjacent side faces shall be 90 0 10.Table 4 P
49、erpendicularity toleranceNominal length, lninPerpendicularity tolerance m0 u lnu 1501 lnu 272 lnu 41Figure 2 Perpendicularity deviation of side faces with a measuring face as a datumKeyABCSide faceMeasuring faceDeviation from perpendicularityCB90C90ALicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 11/12/2007 03:02, Uncontrolled Copy, (c) BSI BSI 2007 7BS 4311:20077.4.4 EdgesThe edges between the side faces shall have a radius or chamfer of not greater than 0,
