1、BRITISH STANDARD BS 4656-29: 1981 Accuracy of machine tools and methods of test Part 29: Specification for automatic lathes, multi-spindle (indexing drum) type UDC 621.9.01 187.001.4:621.941.235.3BS4656-29:1981 This British Standard, having been prepared under the directionof the Mechanical Engineer
2、ing Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 30 September 1981 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for comment 80/77908 DC ISBN 0 580 12320 0 Cooperating organization
3、s The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Department of Trade (Marine Division) Association of Consulting Engineers Department of Transport Associa
4、tion of Hydraulic Equipment Electricity Supply Industry in England and Manufacturers Wales Association of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction British Compressed Air Society Equipment and Cranes British Electri
5、cal and Allied Manufacturers Health and Safety Executive Association (BEAMA) Institution of Gas Engineers British Gas Corporation Institution of Mechanical Engineers* British Gear Manufacturers Association Institution of Plant Engineers British Internal Combustion Engine Institution of Production En
6、gineers* Manufacturers Association Lloyds Register of Shipping British Pump Manufacturers Association London Transport Executive British Steel Corporation Machine Tool Industry Research Association* British Steel Industry Ministry of Defence* British Valve Manufacturers Association National Coal Boa
7、rd Cbmpe Oil Companies Materials Association Chartered Institution of Building Services Process Plant Association Crown Agents for Oversea Governments and Railway Industry Association of Great Britain Administrations Society of Motor Manufacturers and Traders Department of Industry Limited (Mechanic
8、al Engineering)* Telecommunication Engineering and Department of Industry Manufacturing Association (TEMA) (National Engineering Laboratory) Water-tube Boilermakers Association Department of the Environment (PSA)* The organizations marked with an asterisk in the above list, together with the followi
9、ng, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Ball and Roller Bearing University of Aston in Birmingham Manufacturers Association University of Manchester, Institute of Federation of British Engineers Tool Science and Technology Man
10、ufacturers Amendments issued since publication Amd. No. Date of issue CommentsBS4656-29:1981 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Application of test methods 1 4 Abbreviations 1 5 Diagrams 1 6 Machine size ranges 1 Table 1 Ma
11、chine size ranges 1 Table 2 Geometrical tests for automatic lathes multi-spindle (indexing drum) type 2 Table 3 Practical tests for automatic lathes multi-spindle (indexing drum) type 9 Publications referred to Inside back coverBS4656-29:1981 ii BSI 10-1999 Foreword This Part of this British Standar
12、d has been prepared under the direction of the Mechanical Engineering Standards Committee and is based upon a draft prepared by the Machine Tool Industry Research Association. It is one of a series dealing with accuracy tests for various types of machine tools. Multi-spindle automatic lathes are man
13、ufactured usually with 4, 6 or 8 spindles for both bar and chuck work. There are variations in the layout of the machines but the series of tests in this standard are intended, however, to cover all machine configurations and layouts whether for bar or chuck work unless otherwise stated under the pa
14、rticular test. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This docu
15、ment comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, an inside back cover 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.BS4656-29:1
16、981 BSI 10-1999 1 1 Scope This Part of this British Standard specifies, with reference to BS3800, geometrical tests for automatic lathes of multi-spindle indexing drum type and gives corresponding permissible deviations which apply. This standard is applicable to machines of general purpose use and
17、normal accuracy. It deals only with the verification 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 befo
18、re testing accuracy. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Application of test methods 3.1 In applying the tests detailed inTable 2 andTable 3, reference should be made to BS3800, especially concerning the installation of the
19、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 sequence in
20、which the geometrical tests are listed inTable 2 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 done. 3.3 It is not always necessary for all the tests specified in this standard to be carried out. The purchaser shall
21、be at liberty to select, in agreement with the manufacturer, those tests relating to the properties that are of interest to him. The appropriate tests are to be clearly stated when the machine is ordered. If the results of practical tests differ from those of geometric tests having the same object,
22、the results of the practical tests shall be accepted as the only valid ones (see4.3 of BS3800:1964). 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 consideration that the minimum value of toleran
23、ce is0.01mm for geometrical and practical tests. 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. 5 Diagrams For reasons of simplicity the diagrams
24、in this standard illustrate only one type of machine. 6 Machine size ranges For the purposes of this standard machines are divided into size ranges. In general, tolerances are applied according to the machine size, particular note is taken of the fact that machines of a given capacity having more th
25、an6 spindles are generally constructed using a larger machine frame than those of the same capacity having6or fewer spindles. Three machine size ranges based on maximum bar capacity and three corresponding machine size ranges based on nominal chuck capacity are included (seeTable 1). Table 1 Machine
26、 size ranges -/- 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 measurement length being obligatory. -per-
27、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. Range Machines with 6 or fewer spindles Machines with mor
28、e than 6 spindles Bar machines Chucking machines Bar machines Chucking machines mm mm mm mm 1 0 up to 25 0 up to 129 0 up to 19.9 0 up to 99.9 2 25.1 up to 62.9 130 up to 179 20 up to 40.9 100 up to 149 3 63 and over 180 and over 41 and over 150 and overBS 4656-29:1981 2 BSI 10-1999 Table 2 Geometri
29、cal tests for automatic lathes, multi-spindle (indexing drum) type 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 BS 3800:1964 Range 1 Range 2 Range 3 G1 This test applies to both bar and chuc
30、king machines Measurement of periodic axial slip 0.012 0.015 0.020 Dial gauge and special device 5.622.1 and 5.622.2 The value of force F to be applied for the test shall be specified by the manufacturer Dial gauge mounted on the spindle carrier front face or other relevant fixed part of the machine
31、 The test shall be repeated for each spindle G2.1 This test applies to bar machines with work spindles for drawback collets Measurement of radial run-out of the collet internal seating diameter(s) 0.012 0.016 0.025 Dial gauge 5.612.3 Dial gauge is mounted on the spindle carrier front face or other r
32、elevant part of the machine The stylus at right angles to the surface being checked The test shall be repeated for each spindle G2.2 Alternative Using a special test mandrel: (a) at the spindle nose (b) at a distance of 100 from the spindle nose (a) 0.016 (b) 0.030 0.020 0.030 0.030 0.030 Special te
33、st mandrel and dial gaugeBS 4656-29:1981 BSI 10-1999 3 Table 2 Geometrical tests for automatic lathes, multi-spindle (indexing drum) type 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 BS 3800
34、:1964 Range 1 Range 2 Range 3 G3 This test applies to bar machines with work spindles for closing sleeve (dead length) type collets Measurement of radial run-out of the collet internal seating cone of the closing sleeves when mounted in the spindles: (a) at the spindle nose (b) at a distance of 100
35、from the spindle nose (a) 0.020 (b) 0.040 0.025 0.040 0.030 0.040 Test mandrel and dial gauge 5.612.3 Dial gauge is mounted on the spindle carrier front face or other relevant fixed part of the machine The test shall be repeated for each spindle G4 This test applies to chucking machines Measurement
36、of camming of the spindle noses (adjacent to the periphery) 0.015 0.020 0.025 Dial gauge 5.632 and 5.622.2 The value of the force F shall be specified by the manufacturer Dial gauge is mounted on front face of spindle carrier or other relevant fixed part of the machine The test shall be repeated for
37、 each spindleBS 4656-29:1981 4 BSI 10-1999 Table 2 Geometrical tests for automatic lathes, multi-spindle (indexing drum) type 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 BS 3800:1964 Range
38、1 Range 2 Range 3 G5 This test applies to chucking machines Measurement of the radial run-out of the chuck locating diameters of the spindle noses 0.012 0.015 0.020 Dial gauge 5.612.2 Dial gauge is mounted on the spindle carrier front face or other relevant fixed part of the machine with the stylus
39、at right angles to the surface being checked The test shall be repeated for each spindle G6 This test applies to chucking machines Checking of relative position of chuck locating faces; all faces in the same plane 0.040 0.050 0.060 Dial gauge Dial gauge stylus registers on chuck locating face. Spind
40、le carrier rotated through three complete revolutions and the dial gauge readings noted for each spindle after it indexes into position. Deviation is the difference between maximum and minimum readings. Dial gauge is mounted on a suitable fixed part of the machineBS 4656-29:1981 BSI 10-1999 5 Table
41、2 Geometrical tests for automatic lathes, multi-spindle (indexing drum) type 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 BS 3800:1964 Range 1 Range 2 Range 3 G7 Checking of repeatability of
42、 indexing of spindles NOTEPractical test P2 is more suitable and may be used as an alternative to this test 0.020 0.025 0.032 Dial gauge and test mandrels 5.412.1 and 5.432.1 Dial gauge stylus registers on the spindle nose or test mandrel but account shall be taken of diametral variations Rotate spi
43、ndle and take reading at the mean point of the run-out Spindle carrier is rotated through three complete revolutions and the dial gauge readings noted for each spindle after it indexes into position. Deviation is the difference between maximum and minimum readings Dial gauge is mounted on a suitable
44、 part of the machine, e.g. the cross slide so as to allow the gauge to be retracted before each index G8 Checking of radial alignment of spindles All spindles on the same PCD (pitch circle diameter) NOTEPractical test P4 is more suitable and may be used as an alternative to this test 0.016 0.020 0.0
45、25 Dial gauge and test mandrel 5.412.1 and 5.432.1 Dial gauge stylus registers on the spindle or test mandrel, but account shall be taken of diametral variations Rotate spindle and take reading at the mean point of the run-out Spindle carrier is rotated through three complete revolutions and the dia
46、l gauge readings noted for each spindle after it indexes into position. Deviation is the difference between maximum and minimum readings Dial gauge is mounted on a suitable fixed part of the machineBS 4656-29:1981 6 BSI 10-1999 Table 2 Geometrical tests for automatic lathes, multi-spindle (indexing
47、drum) type 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 BS 3800:1964 Range 1 Range 2 Range 3 G9 Checking the parallelism of all longitudinal slide movements with the spindle axes in two mutu
48、ally perpendicular planes (a) and (b) over0.8 maximum cutting stroke or 100 whichever is the shorter NOTEThe practical tests P1(b) and P3(b) are more suitable and may be used as alternatives to this test 0.010 per 100 0.015 per 100 0.020 per 100 Dial gauges and test mandrels 5.412.1 and 5.422.3 Dial
49、 gauges are mounted on the tool slide, which is traversed Account shall be taken of the run-out of the test mandrels The test shall be repeated for each spindle G10 Checking the parallelism of longitudinal slide tenon slots with the tool slide movement 0.015 per 100 0.020 per 100 0.025 per 100 Dial gauge 5.422.2 Dial gauge is mounted on a suitable fixed part of the machine and the tool slide is traversedBS 4656-29:1981 BSI 10-1999 7 Table 2 Geometrical tests for automatic lathes, multi-spindle (indexing drum) type All dimension
