1、BRITISH STANDARD BS 4656-3: 1971 Incorporating Amendment Nos. 1 and 2 Specification for The accuracy of machine tools and methods of test Part 3: Milling machines, Knee and column type, horizontal or vertical spindle plainBS4656-3:1971 This British Standard, having been approved by the Mechanical En
2、gineering Industry Standards Committees was published underthe authority of the Executive Board on 23August1971 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for approval70/10671 ISBN 580 065146 Co-operating organizations The Mechanical
3、 Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with
4、 an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Associated Offices Technical Committee Engineering Equipment Users Association Association of Consulting Engineers Gas Council Association
5、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 Compressed Air Society Institution o
6、f Mechanical Engineers British Electrical and Allied Manufacturers (Automobile Division)* Association* Institution of Production Engineers* British Gear Manufacturers Association Locomotive and Allied Manufacturers British Internal Combustion Engine Association of Great Britain Manufacturers Associa
7、tion 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 Technology* Crown Agents for Oversea Go
8、vernments 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 (Ministry of Generating Board
9、 and the area Boards in Technology) England and Wales Royal Institute of British Architects 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 De
10、partment Traders Ltd. National Federation of Engineers Tool Trades Union Congress Manufacturers Amendments issued since publication Amd. No. Date Comments 3332 November 1980 5156 July1988 Indicated by a sideline in the marginBS4656-3:1971 BSI 09-1999 i Contents Page Co-operating organizations Inside
11、 front cover Foreword ii 1 Scope 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 15 Appendix C Terminology for milling machines, knee and column type, horizontalor vertical spindle plain
12、16 Figure 1 Slab milling operation 17 Figure 2 Face milling operation 17 Figure 3 End milling operation 17 Figure 4 Milling machine, knee and column type, horizontal spindle plain 18 Figure 5 Milling machine, knee and column type, vertical spindle plain and with a sliding vertical spindle head 19 Fi
13、gure 6 Milling machine, knee and column type, horizontal or vertical spindle plain with a movable head 20 Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain 2 Table 2 Details of practical test 14 Table 3 Nomenclature fo
14、r milling machine, knee and column type, horizontal spindle plain 18 Table 4 Nomenclature for milling machine, knee and column type, vertical spindle plain and with a sliding vertical spindle head 19 Table 5 Nomenclature for milling machine, knee and column type, horizontal or vertical spindle plain
15、 with a movable head 20 Table 6 Equivalent terms in German, Spanish, Italian, Dutch and Swedish, corresponding to Figure 4 21 Table 7 Equivalent terms in German, Spanish, Italian, Dutch and Swedish, corresponding to Figure 5 22 Table 8 Equivalent terms in German, Spanish, Italian, Dutch and Swedish,
16、 corresponding to Figure 6 23BS4656-3:1971 ii BSI 09-1999 Foreword This standard makes reference to the following British Standard: BS 3800, Methods for testing the accuracy of machine tools. This Part of this British Standard has been prepared under the authority of the Mechanical Engineering Indus
17、try Standards Committee under an accelerated procedure for implementing agreements of the International Organization for Standardization (ISO) in British Standards. This Part of the standard conforms to ISO1701, “Test conditions for milling machines with table of variable height, with horizontal or
18、vertical spindle Testing of the accuracy”, which has been prepared by Technical Committee39, Machine Tools, of ISO, except that the practical test is not recommended and is shown inAppendix A for information only. Certain additional alternative tests for Tests G15 and G16 in ISO1701 have been omitte
19、d as they were considered technically unsound and are not used by manufacturers in the United Kingdom. Appendix B contains comments relating to slideway straightness. Appendix C contains terminology that is technically equivalent to ISO1701-0, “Test conditions for milling machines with table of vari
20、able height, with horizontal or vertical spindle Part 0: 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 not purport to include all the necessary provisions of a contract.
21、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 front cover, pages i and ii, pages1 to 23 and a back cover. This s
22、tandard 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.BS4656-3:1971 BSI 09-1999 1 1 Scope This Part of this British Standard specifies requirements for the accuracy of knee and column type plain
23、 milling machines with horizontal or vertical spindle by establishing permissable 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 verify compliance with these requirements for mac
24、hines in general use and of normal precision. 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 tomachine characteristics (speeds, feeds etc.) whichshould
25、 generally 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 ofTable 1. The test
26、s to be made in order to verify these requirements shall be in accordance with the details given inTable 1 and the requirements specified in Clause3. 3 Application of test methods 3.1 In applying the tests detailed inTable 1, reference should be made to BS3800, especially concerning the installation
27、 of 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 sequ
28、ence in which the geometrical tests are listed inTable 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 of this type. 4 Abbreviations For the purposes of this standard, various methods of expressing permissable deviations are employed, each having a particular type of
31、application. The methods employed are as follows: -/- This type of 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 measur
32、ement length being obligatory. -per- This type of expression 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.BS4656-3:1971 2 BSI
33、09-1999 Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G1 Straightness of the vertical movement of the knee a) in the plane of symmetry of the
34、machine b) in the plane perpendicular to the preceding one G2 Squareness of the table surface to the column ways for knee (in three positions:in the middle and near the extremities of the travel): a) in the vertical plane of symmetry of the machine b) in the plane perpendicular to the preceding oneB
35、S4656-3:1971 BSI 09-1999 3Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observations and reference to the testcodeBS3800 a) 0.025
36、 for any length of300 Dial gauge and square 5.232.1 Instead of a straightedge, use the vertical arm of a square b) 0.025 for any length of300 Table in central position, table and saddle locked, knee not locked If the spindle can be locked the dial gauge may be mounted on it, if not, it should be pla
37、ced on a fixed part of the machine a) 0.025/300 with!u 90 Dial gauge and square 5.522.2 Table in central position, saddle and knee locked when taking measurements b) 0.025/300BS4656-3:1971 4 BSI 09-1999Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, hor
38、izontal or vertical spindle plain All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G3 Squareness of the table surface to the column ways for the spindle head slide (in three positions: in the middle and near the extremities of the travel): a) in the vertical plane of symmetry
39、of the machine b) in the plane perpendicular to the vertical plane of symmetry of the machine. G4 Flatness of the table surface G5 Parallelism of the table surface to its movement: a) transversely b) longitudinallyBS4656-3:1971 BSI 09-1999 5Table 1 Geometrical tests and accuracy requirements for mil
40、ling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observations and reference to the test code BS3800 a) !u 90 0.025/300 Dial gauge and square 5.522.2 Check with the knee, saddle and table lock
41、ed. Head locked when taking measurements b) 0.025/300 If the spindle can be locked, the dial gauge may be mounted on it, if not, it should be placed on a fixed part of the head 0.04 up to1000. For each1000 increase in table length add0.005 up to a maximum permissible tolerance of0.05 Precision level
42、 or straightedge and slip gauges 5.322 and 5.323 Table and saddle in central position, table not locked, knee and saddle locked Local tolerance0.02 for any length of300 a) 0.025 for any length of300 Straightedge and dial gauge 5.422.21 The stylus of the dial gauge to be placed approximately at the w
43、orking position of the tool b) 0.025 for any length of300 Maximum tolerance: 0.05 Knee locked The measurement may be made on a straightedge laid parallel to the table surface If the spindle can be locked the dial gauge may be mounted on it, if not, it should be placed on a fixed part of the machine
44、(a) Table and spindle head locked (b) Cross slide and spindle head lockedBS4656-3:1971 6 BSI 09-1999Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 1 2 3 No. Diagram Test to be appl
45、ied G6 Parallelism of the spindle axis to the table surface G7 Parallelism of the spindle axis to the transverse movement of the table: a) in the vertical plane b) in the horizontal plane G8 Straightness of the median or reference tee slot of the table G9 Squareness of the spindle axis to the median
46、 or reference T slot of the tableBS4656-3:1971 BSI 09-1999 7Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 4 5 6 Permissible deviation Measuring instruments Observations and refere
47、nce to the test code BS3800 0.025 for any length of300 (freeend of test mandrel inclined downwards) Dial gauge and test mandrel 5.412.4 Table and saddle not locked Knee locked a) 0.025 for any length of300 (free end of the test mandrel inclined downwards) Dial gauge and test mandrel 5.422.3 Table in
48、 central position b) 0.025 for any length of300 Knee locked 0.010 for any length of500 Straightedge and dial gauge or slip gauges, or taut wire and microscope 5.212, 5.212.1, 5.212.3 or 5.232 Maximum tolerance:0.03 The straightedge may be placed directly on the table 0.02/300 (Distance between the t
49、wo points touched) Dial gauge 5.512.1 and 5.512.52 Table in central position Table, saddle and knee lockedBS4656-3:1971 8 BSI 09-1999Table 1 Geometrical tests and accuracy requirements for milling machines knee and column type, horizontal or vertical spindle plain All dimensions are in millimetres. 1 2 3 No. Diagram Test to be applied G10 Parallelism of the median or reference T slot to the longitudinal movement of the table G11 Squareness of the movement of the table transversely to its longitudinal
