1、BRITISH STANDARD BS 4656-5: 1979 Specification for The accuracy of machine tools and methods of test Part 5: Milling machines, knee and column type, horizontal spindle, universal UDC 621.9.01187.001.4:621.914.31BS4656-5:1979 This British Standard, having been prepared under the directionof the Mecha
2、nical Engineering Standards Committee, was published underthe authority of the Executive Board and comesintoeffect on 31October1979 BSI 11-1999 First published September 1973 First revision October 1979 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft
3、 for comment 76/73681 DC ISBN 0 580 10932 1 Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associate
4、d Offices Technical Committee Department of Trade (Marine Division) Association of Consulting Engineers Electricity Supply Industry in England and Association of Hydraulic Equipment Wales Manufacturers Engineering Equipment Users Association Association of Mining Electrical and Federation of Manufac
5、turers of Construction Mechanical Engineers Equipment and Cranes British Compressed Air Society Health and Safety Executive British Electrical and Allied Manufacturers Institution of Gas Engineers Association (BEAMA) Institution of Mechanical Engineers* British Gas Corporation Institution of Plant E
6、ngineers British Gear Manufacturers Association Institution of Production Engineers* British Internal Combustion Engine Lloyds Register of Shipping Manufacturers Association London Transport Executive British Pump Manufacturers Association Machine Tool Industry Research Association* British Steel Co
7、rporation Ministry of Defence* British Steel Industry National Coal Board British Valve Manufacturers Association Oil Companies Materials Association Chartered Institution of Building Services Process Plant Association Crown Agents for Oversea Governments and Railway Industry Association of Great Br
8、itain Administrations Society of Motor Manufacturers and Traders Department of the Environment Limited Department of Industry (Mechanical Telecommunication Engineering and Engineering)* Manufacturing Association (TEMA) Department of Industry (National Engineering Water-tube Boilermakers Association
9、Laboratory) The organizations 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: Ball and Roller Bearing Manufacturers University of Aston in Birmingham Association University of
10、Manchester, Institute of Science Department of the Environment (PSA) and Technology Federation of British Engineers Tool Manufacturers Amendments issued since publication Amd. No. Date of issue CommentsBS4656-5:1979 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii
11、 1 Scope 1 2 References 1 3 Application of test methods 1 4 Abbreviations 1 5 Diagrams 1 Table 1 Geometrical tests and accuracy requirements for milling machines, knee and column type, horizontal spindle, universal 2 Publications referred to Inside back coverBS4656-5:1979 ii BSI 11-1999 Foreword Thi
12、s Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and implements agreements of the International Organization for Standardization (ISO). This edition supersedes the1973 edition of BS4656-5 which will be withdrawn on publication of
13、 this revised edition. This Part of BS4656 is generally in accordance with ISO1701 “Test conditions for milling machines with table of variable height, with horizontal or vertical spindle Addendum1 Annex Universal milling machines with a swivelling table”. This Part of this British Standard varies f
14、rom ISO1701 Addendum1 in the following respects. Clauses. Clauses1, 3 and5 contain the same information that is given in ISO1701 Addendum1 but they are expressed in accordance with an accepted format that has been adopted for the BS4656 series of standards. Clause4 has been added. Inch dimensions. I
15、n accordance with the United Kingdom policy of metrication, inch dimensions given in ISO1701 Addendum1 have not been included in this British Standard. Tables and tests. In column6 ofTable 1, a reference to ISO/R230 “Machine tool test code”, has been replaced by reference to BS3800. Test G0, column2
16、 and column5. Reference to precision level has been excluded because camming cannot be checked by such a means. Test G0, column5. Reference to test mandrel and slip gauges has been deleted because this is not a particularly convenient method of checking. Reference to dial gauge has been added of nec
17、essity. Test G0, column6. Paragraph2 has been added. Test G2, column2. In diagram b) the drawing has been corrected to show only the one particular dial gauge position concerned. Test G2, column6. A statement has been added, viz.: “The angle rotated through shall be either90 or120 . It is important
18、that the amount of movement is the same each side of the centreline.” Test G3, column5. Reference to the length bar, angle plate has been substituted for reference to gauge blocks. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
19、re 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, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard ha
20、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4656-5:1979 BSI 11-1999 1 1 Scope This Part of this British Standard specifies, with reference to BS3800, geometrical tests for milling machines of
21、knee and column type, horizontal spindle, universal, and gives corresponding permissible deviations which apply. The tests in this standard are supplementary to those in BS4656-3. This standard is applicable to machines of general purpose use and normal accuracy. It deals only with the verification
22、of accuracy of the machine. It does not apply to the testing of the running of the machine (vibrations, abnormal noises, stick-slip motion of components, etc.) nor to its characteristics (speeds, feeds, etc.) which should generally be checked before testing accuracy. 2 References The titles of the p
23、ublications referred to in this standard are listed on the inside back cover. 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 of the machine before testing, warming up of spindles and other moving
24、 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 sequence in which the geometrical tests are listed in Table 1 is related to
25、 the sub-assemblies of the machine and it is not intended to impose the practical order in which the tests are to be done. 3.3 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, t
26、hose tests relating to the properties that are of interest to him. The appropriate 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 standard (see2.311 of BS3800:1964), it should be taken into consi
27、deration that the minimum value of tolerance is0.01mm for geometrical tests. 3.5 Unless otherwise specified, geometrical tests are carried out with the knee set at mid-travel on the column. 4 Abbreviations For the purpose of this standard, various methods of expressing permissible deviations are emp
28、loyed, each having a particular type of application. The methods employed are as follows. 5 Diagrams 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. This type of expression
29、 applies to deviations of straightness and parallelism, and is used in fact for local permissible deviations, the measurement length being obligatory. This type of expression applies to deviations of straightness and parallelism and is used to recommend a measurement length, but in this case the pro
30、portionality rule comes into operation if the measurement length differs from that indicated.BS 4656-5:1979 2 BSI 11-1999 Table 1 Geometrical tests and accuracy requirements for milling machines, knee and column type, horizontal spindle, universal All dimensions are in millimetres. 1 2 3 4 5 6 No. D
31、iagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800 G0 Measurement of camming of the table surface when the table is rotated 0.03 for a measuring diameter, D, of1000 Dial gauge Clauses5.632 and5.633 This measurement is to be taken over the to
32、tal usable angular rotation of the table. The error is the difference between readings taken at the extreme swivelled positions of the table, the readings being taken on a radius of500mm from the swivel axis ( D 2 -) =BS 4656-5:1979 BSI 11-1999 3Table 1 Geometrical tests and accuracy requirements fo
33、r milling machines, knee and column type, horizontal spindle, universal All dimensions are in millimetres. 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800 G1 Checking that the table swivel axis and the spindle axis are in
34、 the same vertical plane 0.08 For ! = 120 : actual deviation between the two axes = (A B) For ! = 90 : actual deviation between the two axes= Dial gauge, and special test mandrel fitted with a conical end as shown below: Knee, saddle and housing locked when taking measurements Method of testing 1 Wi
35、th the table set approximately parallel to one of the conical faces of the test mandrel, bring the dial gauge into contact with this face and adjust the table height so that the dial gauge is in a horizontal plane passing through the axis of the test mandrel. 2 Set the table accurately in a vertical
36、 plane parallel to the chosen conical face of the test mandrel by moving the table on its slides, the dial gauge being continuously in contact with the conical face of the test mandrel. 3 Note the dial gauge reading (readingA). 4 Without changing the position of the dial gauge, rotate the table thro
37、ugh angle !. Turn the test mandrel through180 by rotating the spindle, and adjust the table accurately in a vertical plane parallel to the conical face of the test mandrel, as before. 5 Note the new dial gauge reading (reading B).BS 4656-5:1979 4 BSI 11-1999Table 1 Geometrical tests and accuracy req
38、uirements for milling machines, knee and column type, horizontal spindle, universal All dimensions are in millimetres 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the testcodeBS3800 G2 (a) Checking the deviation of the centre line of the c
39、entral or median T-slot from the table swivel axis (a) This is a setting operation only. See column6. For (b): 0.05 For ! = 120 : the deviation between the centre line of the central or median T-slot and the table swivel axis is equal to the difference between the two dial gauge readings. For ! = 90
40、 : the deviation between the centre line of the central or median T-slot and the table swivel axis is equal to the difference between the two dial gauge readings, divided by Dial gauges and special test disc as shown below: D = 80mmmin. d =width of the table T-slot Saddle and knee locked Method of t
41、esting (a) Place the disc on the table, as near as possible to the swivel axis, its spigot d being placed in the median reference slot. Set the table in one of its extreme positions corresponding, for instance, to ! = 120 or ! = 90 . Mount the dial gauge on a fixed part of the machine, and place the
42、 stylus in contact with the edge of the disc in a vertical plane roughly containing the spindle axis and note the dial gauge reading. Rotate the table to its other corresponding terminal position, symmetrical to the previous one, and note the new dial gauge reading. Move the disc or the table in the
43、 longitudinal direction in order to obtain the same dial gauge readings for the two extreme positions of the table. Clamp the disc on the table. (b) Move the dial gauge, always on a fixed part of the machine, but this time in contact with the disc in a plane perpendicular to the previous one. Rotate
44、 the table alternately in its two chosen terminal positions, as in (a), and note the dial gauge readings for each of these two positions. The angle rotated through shall be either90 or120 . It is important that the amount of movement is the same each side of the centre line. (b) 2BS 4656-5:1979 BSI
45、11-1999 5Table 1 Geometrical tests and accuracy requirements for milling machines, knee and column type, horizontal spindle, universal All dimensions are in millimetres 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800 G3 M
46、easurement of the cumulative error in the effective lead of the feed screws: (a) longitudinal feed screw; (b) transverse feed screw. (a) and (b): 0.035 where l=300 Dial gauge andlength bar, angle plate 6.114 The displacement of the table or of the saddle shall be made by a number of full revolutions
47、 of the driving wheel or of the screw, taking care not to disturb the gauging set-up. Test in three positions along the table and in three positions across the table. If the feed screw has been tested by more stringent methods prior to assembly, this test may be dispensed with by producing a test ce
48、rtificate6 blankBS4656-5:1979 BSI 11-1999 Publications referred to BS3800, Methods for testing the accuracy of machine tools. BS4656, The accuracy of machine tools and methods of test. BS4656-3, Milling machines, knee and column type, horizontal or vertical spindle plain. BS4656-5: 1979 BSI 389 Chis
49、wick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding
