1、BRITISH STANDARD BS 4185-7: 1973 Specification for Machine tool components Part 7: Wide range collets UDC 621.9229.322BS4185-7:1973 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee,was published underthe authorityof the Executive Board on 16October
2、1973 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for comment 71/37072 ISBN 0 580 07905 8 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, c
3、onsists of representatives from the following Government departments and scientific and industrial organizations: 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 committee
4、entrusted with the preparation of this British Standard: Associated Offices Technical Committee Electricity Council, the Central Electricity Association of Consulting Engineers Generating Board and the Area Boards in Association of Hydraulic Equipment England and Wales Manufacturers Ltd Engineering
5、Equipment Users Association Association of Mining Electrical and Gas Council Mechanical Engineers Institution of Civil Engineers British Compressed Air Society Institution of Gas Engineers British Electrical and Allied Manufacturers Institution of Heating and Ventilating Association* Engineers Briti
6、sh Gear Manufacturers Association Institution of Mechanical Engineers* British Internal Combustion Engine Institution of Mechanical Engineers Manufacturers Association (Automobile Division) British Mechanical Engineering Confederation Institution of Plant Engineers British Pump Manufacturers Associa
7、tion Institution of Production Engineers* British Steel Industry London Transport Executive Crown Agents for Oversea Governments and Machine Tool Trades Association* Administrations Ministry of Defence Department of Employment (H.M. Factory Ministry of Defence, Army Department* Inspectorate) Nationa
8、l Coal Board Department of the Environment* National Physical Laboratory (Department of Department of Trade and Industry Trade and Industry) Department of Trade and Industry (Marine Process Plant Association Division) Railway Industry Association of Great Britain Department of Trade and IndustryNati
9、onal Royal Institute of British Architects Engineering Laboratory Telecommunications Engineering Manufacturing Association Association of Scientific Technical and Society of Motor Manufacturers and Traders Managerial Staffs Standards Associates Gauge and Toolmakers Association Trades Union Congress
10、Machine Tool Industry Research Association University of Aston in Birmingham Ministry of Defence, Air Force Department University of Manchester Institute of National Federation of Engineers Tool Science Technology Manufacturers 9 individual experts Amendments issued since publication Amd. No. Date o
11、f issue CommentsBS4185-7:1973 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Terms and definitions 1 3 Collet series and sizes 1 4 Dimensions and accuracy 2 5 Designation 2 6 Marking 2 7 Second operation work 2 Appendix A Maximum wide range collet c
12、apacity obtainable for bars of round, hexagonal and square cross-section for each series and type 7 Figure 1 Wide range collets 4 Table 1 Wide range collet series and hole sizes for round, hexagonal and square bar 3 Table 2 Dimensions of wide range collets, Type A, B and C 5 Table 3 Tolerances on co
13、ncentricity 6BS4185-7:1973 ii BSI 11-1999 Foreword This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee. It is based on a draft prepared by the Machine Tool Trades Association. Wide range collets, sometimes known as “multisize”, “mult
14、ibore” of “flexible” collets, are capable of being used for working both bright and precision black bar. The standard covers three distinct types of dimensionally interchangeable wide range collets with30 cone angles, which are suitable for use on capstan and turret lathes. These types of wide range
15、 collet may also be used on single spindle automatic lathes but two operating sleeves may be required to obtain the full range. 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. Complia
16、nce 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 have h
17、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4185-7:1973 BSI 11-1999 1 1 Scope 1.1 This standard specifies a metric series of wide range collets. Three distinct types, designated TypeA, Type B and Type C, are detailed, the external dimensions
18、of which allow interchangeability of types with the various makes of capstan and turret lathes. 1.2 Wide range collets to this standard may be used in either dead length or draw-in collet chucks of suitable design. 1.3 Wide range collets to this standard may also be used on single spindle automatic
19、lathes. However, it may be necessary to provide the collet chuck with two operating sleeves in order to obtain the full collet range. 2 Terms and definitions For the purposes of this British Standard the following terms and definitions shall apply: 2.1 wide range collet a holding device comprising s
20、egments or blades held together in a flexible manner and designed for rapid closing onto the workpiece or tool for the purpose of gripping and locating it. Each type of collet is available in a wide range of sizes the three basic types of collets are described below: a) Type A (seeFigure 1). Compris
21、es wedge-shaped conical segments which are maintained at uniform separation from each other by compression springs. The segments are retained by circlips. b) Type B (seeFigure 1). Comprises a number of wedge-shaped blades bonded together with resilient synthetic rubber which also maintains the corre
22、ct tension and spacing. The rubber is oil and coolant resistant. c) Type C (seeFigure 1). Comprises a number of wedge-shaped blades free to slide in a uniformly slotted body. The blades are tensioned by coil springs. 2.2 range the difference between the maximum and minimum nominal bore sizes of a co
23、llet 2.3 major diameter the largest diameter of the external, coned head of the collet across the theoretical sharp edges 2.4 operating sleeve mouth diameter the major diameter of the mouth of the internal cone in the operating sleeve across the theoretical sharp edges 2.5 operating face the thrust
24、face of the collet through which the operating or clamping force is applied 2.6 cone angle the included angle of the cone 2.7 cone length the axial length from the operating face to the termination of the truncated cone 2.8 overall length (dimensions given for reference purposes only.) The full axia
25、l length of the collet 2.9 standout the axial distance from the operating face to the mouth of the operating sleeve 2.10 bore the internal gripping surface of the collet 2.11 nose the projection forwards from the operating face 3 Collet series and sizes 3.1 Three types of wide range collet as descri
26、bed in subclause2.1 are specified, and are designated as Types A, B and C. (SeeFigure 1 andTable 2.) NOTEAll three types of wide range collets are not currently available in all the series, sizes and configurations detailed inTable 1. Those series, sizes and configurations which are currently availa
27、ble are detailed inAppendix A. Six series of collets are detailed which are applicable to all three types of collet. (SeeTable 1.) 3.2 The size and capacity of individual collets provided for within each series are given inTable 1. 3.3 Table 1 also indicates the collet sizes which may be produced fo
28、r gripping round, hexagonal and square cross-sectional bar. 3.4 Each collet should accept0.25mm above and below the range quoted.BS4185-7:1973 2 BSI 11-1999 4 Dimensions and accuracy 4.1 Wide range collets shall, according to the type, conform to the dimensions and tolerances given inTable 2. 4.2 Wh
29、ere relevant, the dimensions given inTable 2 relate to wide range collets set to accept nominal maximum bore sizes plus0.25mm. 4.3 Concentricity tolerances for wide range collets are given inTable 3. The tolerances shall apply at any point along the full test length from the collet nose. The toleran
30、ces only apply to wide range collets for gripping round bar. 4.4 Concentricity tests shall be carried out with the collet mounted in a suitable test spindle and gripping a test bar. The tolerance values will not necessarily apply when the collet is subsequently mounted in a machine tool. 4.5 The tes
31、t bars shall conform to a tolerance on cylindricity of0.0001 L, where L is the length of the test bar. 4.6 Collets of greater accuracy than inTable 3 may be provided subject to agreement between the manufacturer and the customer. 4.7 The accuracy of collets for gripping hexagon and square bar shall
32、be agreed between the manufacturer and the purchaser. 4.8 Collets shall be free from sharp edges and burrs. 5 Designation Wide range collets conforming to this standard shall be designated by with type, series number, size range and number of this standard, e.g.: 6 Marking Wide range collets conform
33、ing to this standard shall be marked by the manufacturer with type, series number and size range and number of this standard, e.g.: 7 Second operation work For second operation work, where only a short length of the workpiece is gripped in the front of the collect, a suitable rear supporting device
34、will be necessary. Type A, series 40, size range 12 to 15 A 40 12/15 BS 4185-7 Type B, series 65, size range48 to51mm to BS4185-7: B6548/51 BS4185-7BS4185-7:1973 BSI 11-1999 3 Table 1 Wide range collet series and hole sizes for round, hexagonal and square bar All dimensions in mm. 1 2 3 4 5 6 7 Seri
35、es no. 12 25 40 50 65 75 Hole size range o o o o o o min. max. A/F A/F A/F A/F A/F A/F 1.5 3.0 3.0 4.5 4.5 6.0 6.0 7.5 7.5 9.0 9.0 10.5 10.5 12.0 12.0 13.5 * * * * * * * a * * * * * * * * * * * * * 36 69 9 12 12 15 15 18 18 21 21 24 24 27 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
36、 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 27 30 30 33 33 36 36 39 39 42 42 45 45 48 48 51 51 54 54 57 57 60 60 63 63 66 66 69 69 72 72 75 75 78 * * * * a * * * * * * * * * * * * * a * * * * * * * * * * * * * * * * *
37、 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * a * * * * * * * * * * * * * * * * * * * * * * * * a Non-preferred.BS 4185-7:1973 4 BSI 11-1999 Figure 1 Wide range colletsBS 4185-7:1973 BSI 11-1999 5 Table 2 Dimensions of wide range collets, Type A, B and C All dime
38、nsions in mm. NOTEAll dimensions relate to wide range collets set to accept nominal maximum bore size plus0.25mm.BS4185-7:1973 6 BSI 11-1999 Table 3 Tolerances on concentricity All dimensions in mm. 1 2 3 Capacity Test length Permissible F.I.M. 1.5 3 3 6 6 10.5 10.5 18 18 24 24 30 30 51 above 51 10
39、16 25 40 50 60 80 100 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.04 See also4.5.BS4185-7:1973 BSI 11-1999 7 Appendix A Maximum wide range collet capacity obtainable for bars of round, hexagonal and square cross-section for each series and type 1 2 3 4 5 6 7 8 9 10 Type A Type B Type C Series round hexagon
40、al square round hexagonal square round hexagonal square number 12 13.5 12 10.5 13.5 25 27 24 18 27 40 42 39 30 39 39 33 50 54 48 39 51 51 42 65 66 57 45 66 63 54 75 78 69 548 blankBS4185-7:1973 BSI 11-1999 BSI Certification Trade Mark The Kitemark The British Standards Institution is the owner of a
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