1、BRITISH STANDARD BS 4656-9: 1974 Incorporating Amendment No. 1 Specification for The accuracy of machinetools and methods of test Part 9: External cylindrical grinding machines with reciprocating table UDC 621.9.01-187.001.4:621.924.56BS4656-9:1974 This British Standard, having been approved by the
2、MechanicalEngineering IndustryStandards Committee,was published underthe authority of the Executive Board on 30September1974 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for approval 73/36143 ISBN 0 580 08376 4 Co-operating organizatio
3、ns The Mechanical 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 organiza
4、tions marked with 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 Department of Trade and Industry National Association of Consulting Engineers Engin
5、eering Laboratory* Association of Hydraulic Equipment Electricity Supply Industry in England and Manufacturers Ltd. Wales Association of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction British Compressed Air Society Equip
6、ment and Cranes British Electrical and Allied Manufacturers Institution of Gas Engineers Association Institution of Heating and Ventilating British Gas Corporation Engineers British Gear Manufacturers Association Institution of Mechanical Engineers* British Internal Combustion Engine Institution of
7、Plant Engineers Manufacturers Association Institution of Production Engineers* British Mechanical Engineering Confederation London Transport Executive British Pump Manufacturers Association Machine Tool Trades Association* British Steel Corporation Ministry of Defence British Steel Industry Ministry
8、 of Defence, Army Department* Crown Agents for Oversea Governments and National Coal Board Administrations Process Plant Association Department of Employment (HM Factory Railway Industry Association of Great Britain Inspectorate) Royal Institute of British Architects Department of the Environment* T
9、elecommunications Engineering Department of Trade and Industry ENT Manufacturing Association Department of Trade and Industry (Marine Division) Association of Scientific Technical and Society of Motor Manufacturers and Traders Managerial Staffs Ltd. Department of Trade and Industry Trades Union Cong
10、ress Mechanical Engineering University of Aston in Birmingham Gauge and Toolmakers Association University of Manchester Institute of Science Machine Tool Industry Research Association and Technology Ministry of Defence, Air Force Department Five individual experts National Federation of Engineers To
11、ol Manufacturers Amendments issued since publication Amd. No. Date of issue Comments 5372 March 1987 Indicated by a sideline in the marginBS4656-9:1974 BSI 03-2000 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Application of test methods 1 3 Abbreviations 1 4
12、Diagrams 1 Table 1 Geometrical tests 2 Table 2 Practical tests 8 Publication referred to Inside back coverBS4656-9:1974 ii BSI 03-2000 Foreword This Part of this British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and implements agreement
13、s of the International Organization for Standardization (ISO). This Part of the standard is generally in accordance with ISO2433 “Test conditions for external, cylindrical grinding machines with a movable table testing of accuracy” but varies from it in the following respects: Test G2. An alternativ
14、e test permitted by ISO has been deleted. This test was one where the straightness of the longitudinal movement of the table in the horizontal plane was checked by means of a microscope and taut wire. This test is not considered necessary for UK practice. Test P1(a) and P2. The references to diamete
15、r in respect of the definition for circularity in ISO2433 has been replaced by reference to radius. This is in accordance with Resolution 2 taken by ISO/TC39/SC2, Acceptance conditions, in Stockholm in June1973 when it was agreed that this series of International Standards should be in conformity wi
16、th ISO/R1101 “Tolerances of form and of position” Part 1 “Generalities, symbols, indications on drawings”. This reference to radius has made it necessary to correct the values for permissible deviations in tests P1(a) and P2 by dividing the values quoted in ISO2433 by two. A note applicable to tests
17、 P1 and P2 of ISO2433 stating that any taper should be such that the major diameter is near the work head has not been included as this is considered inappropriate for cylindrical grinding machines. Clauses 1 and 5 contain the same information as is given in ISO2433 but have been expressed more in a
18、ccordance with accepted English usage. In accordance with the UK policy of metrication, inch dimensions given in ISO2433 have not been included in this British Standard. In Table 1 the reference to spindle has in many cases been clarified by the addition of the word “workhead”. Throughout the text o
19、f the table there have been minor changes in wording to achieve greater compliance with English usage but no alteration in substance. In addition examples of precise measuring instruments have been included in tests P1 and P2. In certain tests superfluous headings denoting sub-units of the machine h
20、ave been deleted from the object column. The headings concerned are “Bed” TestG1; “Tailstock” Test G7; “Grinding wheel head” Test G9. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. C
21、ompliance 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 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
22、have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4656-9:1974 BSI 03-2000 1 1 Scope This Part of this British Standard specifies requirements for the accuracy of external cylindrical grinding machines with reciprocating table, by establishing
23、 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 verify compliance with these requirements. It applies to machines of which the swing diameter does not exceed800mm and
24、 the distance between centres does not exceed4000mm. This standard is applicable to machines of general purpose use and normal accuracy. 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
25、 motion of components etc.) nor to machine characteristics (speeds, feeds etc.) which should generally be checked before testing accuracy. NOTEThe title of the British Standard referred to in this standard is given on the inside back cover. 2 Application of test methods 2.1 In applying the tests det
26、ailed inTable 1 andTable 2, reference should be made to BS3800, especially concerning the installation 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. 2.2 The tests may be applied in
27、 any order that is practicable and that makes for ease of mounting of instruments or gauging. The sequence in which the geometrical tests are listed inTable 1 is related 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. 2.3
28、It is not always necessary for all the tests specified in this standard to be carried out. The purchaser shall 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
29、 ordered. 2.4 Practical tests shall be made with finishing cuts and not with roughing cuts which are liable to generate appreciable cutting forces. 2.5 When establishing the tolerance for a measuring range different from that given in this standard (see2.311 in BS3800:1964) it should be taken into c
30、onsideration that the minimum value of tolerance is0.001mm for geometrical and practical tests. 3 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: 4 D
31、iagrams For reasons of simplicity, the diagrams in this standard illustrate only one type of machine. / 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 f
32、act for local permissible deviations, the measurement 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 di
33、ffers from that indicated.BS 4656-9:1974 2 BSI 03-2000 Table 1 Geometrical tests for external cylindrical grinding machines with reciprocating table All dimensions are in millimetres 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test co
34、de BS 3800:1964 G 1a Levelling of the slideways a) Longitudinal inspection: Straightness of the slideways in the vertical plane 0.02 up to 1 000 For each 1 000 increase in length, add: 0.015 Maximum permissible deviation: 0.05 Local tolerance: 0.005 over any length of 250 Precision level, optical or
35、 other methods a) 3.11, 3.21, 5.212.21 and 5.212.22 Measurements shall be made at a number of positions equally spaced along the length of the bed. For machines standing on three support points or having a distance between centres less than1 000mm the table need not be removed. In this case the leve
36、l shall be placed successively on the exposed portions of the slideways and on the table. The table should preferably be in its central position G 1b b) Transverse inspection: Parallelism of the slideways in the vertical plane Variation of level: DC au 500:0.02/1 000 DC a500:0.04/1 000 Precision lev
37、el b) 5.412.7 A level shall be placed transversely on the slideways, and measurements shall be taken at a number of positions equally spaced along the length of the bed. The variation of level measured at any position shall not exceed the permissible deviation G 2 Checking of straightness of the sli
38、deways in a horizontal plane 0.02 up to 1 000 For each 1 000 increase in length, add: 0.02 Maximum permissible deviation: 0.05 Local tolerance: 0.006 over any length of 300 Straightedge, support and dial gauge 5.232.1 The dial gauge shall be fixed on a support A of a suitable form such that it can s
39、lide in the slideways with the stylus touching a straightedge laid parallel to the slideways Alternative (This alternative is for small machines where the table is not to be dismantled) Checking of straightness of the longitudinal movement of the table in the horizontal plane 0.01 up to 1 000 For ea
40、ch 1 000 increase in length, add: 0.01 Maximum permissible deviation: 0.025 5.232.1 or use the following method: For alternative test the dial gauge support shall be placed on a fixed part of the machine, the stylus shall touch a straightedge laid parallel to the general direction of the longitudina
41、l movement of the table a DC = Distance between centres.BS 4656-9:1974 BSI 03-2000 3 Table 1 Geometrical tests for external cylindrical grinding machines with reciprocating table All dimensions are in millimetres 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations
42、 and references to the test code BS 3800:1964 G3 Checking of parallelism of the location surfaces for the workhead and tailstock to the longitudinal movement of the table 0.01 up to 1 000 For each 1 000 increase in length, add: 0.01 Maximum permissible deviation: 0.03 Local tolerance: 0.003 over any
43、 length of 300 Dial gauge(s) 5.422.22 Place a dial gauge(s) on a fixed part of the machine and take measurements successively on the location surfaces for the workhead and the tailstock. The table setting carried out during this test shall not be modified for performing testsG6, G 7 and G 8 G4 (Test
44、s G 4 and G 5 apply only to machines having a rotating workhead spindle) a) Measurement of run-out of the external register diameter of the workhead spindle b) Measurement of periodic axial slip of the workhead spindle c) Measurement of camming of the register face of the workhead spindle (including
45、 periodic axial slip) a) 0.005 b) 0.005 c) 0.01 Dial gauge a) 5.612.2 In the case of a tapered spindle nose the stylus of the dial gauge shall be set normal to the surface which is to be checked b) and c) 5.62, 5.621.2, 5.622.1, 5.622.2 and 5.632 For the dial gauge position, see Figures 59 to 64 and
46、 67, Clauses 5.62, 5.622 and 5.632. The value of force F to be applied for the tests a), b) and c) shall be specified by the manufacturerBS 4656-9:1974 4 BSI 03-2000 Table 1 Geometrical tests for external cylindrical grinding machines with reciprocating table All dimensions are in millimetres 1 2 3
47、4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS 3800:1964 G 5 1) Measurement of run-out of the axis of the workhead spindle taper: a) near the spindle nose b) at a distance from the spindle nose equal to aor not more than 300 mm 1)
48、 a) 0.005 b) 0.015 for a measuring length of 300 Dial gauge and test mandrel 5.612.3 2) Measurement of run-out of the workhead spindle centre nose 2) 0.005 Dial gauge 5.612.2 The dial gauge being set normal to the nose of the centre, and tolerance being given in a plane perpendicular to the spindle
49、axis, the readings observed shall therefore be divided by cos , being the semi-cone angle of the taper. The value of force F to be applied shall be specified by the manufacturer G 6 1) Dead spindle Checking of parallelism of the taper bore of the workhead spindle to the table movement: a) in a horizontal plane b) in a vertical plane 0.025 for a measuring length of 300 (end of the test mandrel directed towards wheel and upwards) Dial gauge and test mandrel 5.412.1 and 5.422.3 The table setting established for
