1、BRITISH STANDARD BS4656-4: 1971 Incorporating Amendment Nos.1 and2 Specification for The accuracy of machine tools and methods of test Part4: Milling machines, bed type, horizontal or vertical spindleBS4656-4:1971 This British Standard, having been approved by the MechanicalEngineering IndustryStand
2、ards Committee,was published underthe authorityof the ExecutiveBoardon 23 August1971 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for approval 70/21639 ISBN 580 06524 3 Co-operating organizations The Mechanical Engineering Industry Sta
3、ndards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Engineering Equipment Users Association Association of Consulting En
4、gineers Gas Council Association of Mining Electrical and Institution of Civil Engineers Mechanical Engineers Institution of Gas Engineers Board of Trade Institution of Heating and Ventilating British Chemical Plant Manufacturers Engineers Association Institution of Mechanical Engineers* British Comp
5、ressed Air Society Institution of Mechanical British Electrical and Allied Manufacturers Engineers(Automobile Division)* Association* Institution of Production Engineers* British Gear Manufacturers Association Locomotive and Allied Manufacturers British Internal Combustion Engine Association of Grea
6、t Britain Manufacturers Association London Transport Executive British Steel Industry Machine Tool Trades Association* British Mechanical Engineering Ministry of Defence, Army Department* Confederation Ministry of Public Building and Works* British Pump Manufacturers Association Ministry of Technolo
7、gy* Crown Agents for Oversea Governments and Ministry of Technology National Administrations Engineering Laboratory Department of Employment and Ministry of Transport Productivity(H.M. Factory Inspectorate) National Coal Board Electricity Council, the Central Electricity National Physical Laboratory
8、(Ministry of Generating Board and the Area Boards in Technology) England and Wales Royal Institute of British Architects The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the com
9、mittee entrusted with the preparation of this British Standard. Association of Scientific, Technical and Production Engineering Research Managerial Staffs Association Ministry of Defence, Air Force Department Society of Motor Manufacturers and Ministry of Defence, Navy Department Traders Ltd. Nation
10、al Federation of Engineers Tool Trades Union Congress Manufacturers Amendments issued since publication Amd. No. Date Comments 4185 February1983 5157 July1988 Indicated by a sideline in the marginBS4656-4:1971 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Sc
11、ope 1 2 Accuracy requirements 1 3 Application of test methods 1 4 Abbreviations 1 Appendix A Practical test 14 Appendix B Comments relating to slideway straightness 16 Appendix C Terminology for milling machines, bed type, horizontal or verticalspindle 16 Figure 1 Slab milling operation 17 Figure 2
12、Face milling operation 17 Figure 3 End milling operation 18 Figure 4 Milling machine, bed type, horizontal spindle 19 Figure 5 Milling machine, bed type, vertical spindle 20 Table 1 Geometrical tests for milling machines of bed type with horizontalorvertical spindles 2 Table 2 Practical test 14 Tabl
13、e 3 Nomenclature for milling machine, bed type, horizontal spindle 19 Table 4 Nomenclature for milling machine, bed type, vertical spindle 20 Table 5 Equivalent terms in German, Spanish, Italian, Dutch and Swedish, corresponding to Figure 4 21 Table 6 Equivalent terms in German, Spanish, Italian, Du
14、tch and Swedish, corresponding to Figure 5 22BS4656-4:1971 ii BSI 10-1999 Foreword This standard makes reference to the following British Standard: BS3800, Methods for testing the accuracy of machine tools. This Part of this British Standard has been prepared under the authority of the Mechanical En
15、gineering Industry Standards Committee under an accelerated procedure for implementing agreements of the International Organization for Standardization(ISO) in British Standards. This Part of the standard is compatible with ISO1984, “Test conditions for milling machines with table of fixed height, w
16、ith horizontal or vertical spindle, testing of accuracy”, which has been prepared by Technical Committee39, Machine Tools, of ISO, except that the practical test is not recommended and is shown in Appendix A for information only. Appendix B contains comments relating to slideway straightness. This P
17、art of this standard whilst based on ISO1984 incorporates slight alterations so that it is applicable to the type of machine manufactured in the United Kingdom. The modifications, principally to drawings, to the ISO agreements have not affected tolerances or the nature of tests carried out. These ha
18、ve been solely concerned with ensuring that the tests are not only applicable to machines with transverse table movement, which are manufactured in Europe, but also to machines with transverse movement achieved by moving columns or quill type cutter spindles as manufactured in the United Kingdom. Ce
19、rtain additional alternative test methods for tests GI4 and GI5 included in the ISO agreements have also been omitted as they were considered technically unsound and are not used by manufacturers in the United Kingdom. Appendix C gives terminology that is technically equivalent to ISO1984-0, “Test c
20、onditions for milling machines with table of fixed height with horizontal or vertical spindle, testing of accuracy Part0: General introduction”. Reference to side and face milling, slot milling using end mills and profile milling using the side of end mills has been added. A British Standard does no
21、t purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside f
22、ront cover, pagesi andii, pages1 to22 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4656-4:1971 BSI 10-1999 1 1 Scope This Part of this British Standard specifi
23、es requirements for the accuracy of milling machines of bed type with horizontal or vertical spindle by establishing permissible deviations from certain essential dimensional and geometrical characteristics, and by prescribing, by reference to BS3800, the details of the tests to be carried out to ve
24、rify compliance with these requirements. The standard deals only with the verification of accuracy, and does not apply to the testing of the running of the machine(vibrations, abnormal noises, stick-slip motion of components etc.) nor to machine characteristics(speeds, feeds etc.) which should gener
25、ally be checked before testing accuracy. Definitions and terminology are given in Appendix C. NOTEThe title of the British Standard referred to in this standard is given on pageii. 2 Accuracy requirements Machines shall comply with the accuracy requirements given in column4 of Table 1. The tests to
26、be made in order to verify these requirements shall be in accordance with the details given in Table 1, and the requirements specified in Clause3. 3 Application of test methods 3.1 In applying the tests detailed in Table 1, reference should be made to BS3800, especially concerning the installation o
27、f the machine before testing, warming up of spindles and other moving parts, the description of measuring methods and the recommended accuracy of testing equipment. 3.2 The tests may be applied in any order that is practicable and that makes for ease of mounting of instruments or gauging. The sequen
28、ce in which the geometrical tests are listed in Table 1 relates to the sub-assemblies of the machine, and it is not intended to impose the practical order in which the tests are to be made. 3.3 It is not always necessary for all the tests specified in this standard to be carried out. The purchaser s
29、hall be at liberty to select, in agreement with the manufacturer, those tests relating to the properties that are of interest to him, and these tests are to be clearly stated when the machine is ordered. 3.4 When establishing the tolerance for a measuring range different from that given in this stan
30、dard(see2.311 in BS3800:1964) it should be taken into consideration that the minimum value of tolerance is0.01mm for milling machines. 3.5 These tests may be applied not only to machines which have transverse table movement but also those with moving columns or quill shaft units. Those tests which a
31、re applicable to a particular type of machine are indicated where appropriate. 4 Abbreviations For the purposes of this standard, various methods of expressing permissible deviations are employed, each having a particular type of application. The methods employed are as follows: - - -/- This type of
32、 expression applies to deviations of perpendicularity that are ratios. - - - for any length of - This type of expression applies to deviations of straightness and parallelism, and is used in fact for local permissible deviations, the measurement length being obligatory. -per - This type of expressio
33、n applies to deviations of straightness and parallelism, and is used to recommend a measurement length, but in this case the proportionality rule comes into operation if the measurement length differs from that indicated.BS4656-4:1971 2 BSI 10-1999 Table 1 Geometrical tests for milling machines of b
34、ed type with horizontal or verticalspindles All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G1 Verification of straightness of the vertical movement of the spindle head slide: (a) in the vertical plane of symmetry of the machine or transverse vertical plane (b) in the plane p
35、erpendicular to the plane of symmetry of the machine or transverse vertical plane G2 Verification of squareness of the table surface to the column ways for the spindle head slide(inthree positions in the middle and near the extremities of the travel) (a) in the vertical plane of symmetry of the mach
36、ine (b) in the plane perpendicular to the vertical plane of symmetry of the machineBS4656-4:1971 BSI 10-1999 3Table 1 Geometrical tests for milling machines of bed type with horizontal or verticalspindles All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observatio
37、ns and references to the test code BS3800 (a)0.025 for a measuring length of300 (b)0.025 for a measuring length of300 Dial gauge and straightedge set upright 5.232.1 Instead of a straightedge use the vertical arm of a square Table in central position, all longitudinal and transverse movements locked
38、 If the spindle can be locked the dial gauge may be mounted on it. If the spindle cannot be locked, it should be placed on the spindle head of the machine (a)0.025/300 with!u 90 (b)0.025/300 Dial gauge and square 5.522.2 Table in central position, all longitudinal and transverse movements locked Spi
39、ndle head slide locked when taking measurements If the spindle can be locked, the dial gauge may be mounted on it. If the spindle cannot be locked, the dial gauge should be placed on the spindle head of the machineBS4656-4:1971 4 BSI 10-1999Table 1 Geometrical tests for milling machines of bed type
40、with horizontal or verticalspindles All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G3 Verification of flatness of the table surface G4 (a) Verification of the parallelism of the table surface to the longitudinal movement (b) Verification of the parallelism of the table surfa
41、ce to the transverse movement G5 (a) Measurement of vertical run-out of the external centring surface on the spindle nose(for machines having this feature) (b) Measurement of axial run-out(camming) of the face of the spindle nose(including periodic axial slip) (c) Measurement of periodic axial slipB
42、S4656-4:1971 BSI 10-1999 5Table 1 Geometrical tests for milling machines of bed type with horizontal or verticalspindles All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observations and references to the test code BS3800 0.04 up to1000 For each1000 increase in ta
43、ble length, add0.005 up to a maximum permissible deviation of0.05 Local tolerance: 0.02 for any300 length Precision level or straightedge and slip gauges 5.322 and 5.323 Table and cross slide in central position, table not locked, cross slide locked (a)0.025 for any300 length Maximum permissible dev
44、iation0.05 (b)0.025 for any300 length Straightedge and dial gauge 5.422.21 The stylus of the dial gauge to be placed approximately at the working position of the tool The measurement may be made on a straightedge laid parallel to the table surface If the table length is greater than1600mm the inspec
45、tion shall be carried out by successive movements of the straightedge If the spindle can be locked, then after locking the spindle head slide, the dial gauge may be mounted on it If the spindle cannot be locked, then the dial gauge should be placed on a fixed part of the machine (a) Cross slide and
46、spindle head slide locked (b) Table and spindle head slide locked (a)0.01 (b) 0.02 (c) 0.01 Dial gauge (a) 5.612.2 (b) 5.632 The distance A of dial gauge (b) from the spindle axis should be as large as possible (c) 5.622.1 and 5.622.2 A force F, specified by the manufacturer of the machine should be
47、 exerted by pressing towards the housing for tests(b) and (c)BS4656-4:1971 6 BSI 10-1999Table 1 Geometrical tests for milling machines of bed type with horizontal or verticalspindles All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G6 Measurement of radial run-out of the inter
48、nal taper of the spindle: (a) close to the spindle nose (b) at a distance of300 from the spindle nose G7 Verification of parallelism of the spindle axis to the table surface G8 Verification of squareness of the spindle axis to the table surface (a) in the vertical plane of symmetry of the machine (b
49、) in the plane perpendicular to the vertical plane of symmetry of the machineBS4656-4:1971 BSI 10-1999 7Table 1 Geometrical tests for milling machines of bed type with horizontal or verticalspindles All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observations and references to the test code BS3800 (a)0.01 (b)0.02 Dial gauge and test mandrel 5.612.3 0.025 for any300 length (free end of the test mandrel inclined downwards) Dial gauge and test mandrel 5.412.4 Table and cross slide unlocke
