1、BRITISH STANDARD BS2697:1976 Specification for Rack type gear cutters, metric module UDC 621.914.6:621.833BS2697:1976 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee was published underthe authority of the Executive Board on 30 July197
2、6 BSI11-1999 First published January1956 First revision July1976 The following BSI references relate to the work on this standard: Committee reference MEE/127 Draft for comment74/75361DC ISBN 0 580 09274 7 Cooperating organizations The Mechanical Engineering Industry Standards Committee, under whose
3、 supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: Associated Offices Technical Committee Electricity Supply Industry in England Association of Consulting Engineers and Wales Associatio
4、n of Hydraulic Equipment Engineering Equipment Users Association Manufacturers Ltd. Federation of Manufacturers of Construction Association of Mining Electrical and Equipment and Cranes Mechanical Engineers Health and Safety Executive British Compressed Air Society (HM Factory Inspectorate) British
5、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 Plant Engineers Manufact
6、urers 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 National Coal Board Crown Agent
7、s for Oversea Governments and Process Plant Association Administrations Railway Industry Association of Great Britain Department of the Environment Royal Institute of British Architects Department of Industry Mechanical Society of Motor Manufacturers and Engineering Traders Ltd. Department of Indust
8、ry National Telecommunication Engineering and Engineering Laboratory* Manufacturing Association Department of Trade 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 Stan
9、dard: Gauge and Toolmakers Association Navy and Vickers Gearing Research Milling Cutter and Reamers Association Association National Federation of Engineers Tool North East Coast Institution of Engineers Manufacturers andShipbuilders Amendments issued since publication Amd. No. Date of issue Comment
10、sBS2697:1976 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Terminology 1 4 Tooth form 1 5 Dimensions 1 6 Accuracy requirements 1 7 Marking 2 8 Ordering instructions 2 Figure 1 Rack type gear cutter; terminology 2 Figure 2 Rectangular
11、mounted cutter 3 Figure 3 Inclined mounted cutter 3 Figure 4 Inclined mounted parallelogram cutter 3 Figure 5 20 pressure angle basic gear rack tooth profile in terms of unit normal metric module 3 Figure 6 Position of first tooth 6 Table 1 Dimensions of rack type cutters 4 Table 2 Dimensions of rac
12、k type cutters, inclined mounted parallelogram type 5 Table 3 Dimensions to position of first tooth on all types of cutters 6 Table 4 Accuracy requirements for rack type gear cutters 7 Publications referred to Inside back coverBS2697:1976 ii BSI 11-1999 Foreword This British Standard has been prepar
13、ed under the authority of the Mechanical Engineering Standards Committee and is one of a number dealing with gear cutting tools. This edition is a revision of BS2697:1956 but in accordance with the UK policy of metrication, diametral pitch cutters have been replaced with metric module cutters. It wa
14、s not considered practicable to include dimensions of backplates in this standard. But if these are ordered it is essential to state the thickness of backplate required and also the cutter type as the latter determines the depth of the backplate. A British Standard does not purport to include all th
15、e 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 document comprises a front cover, an inside front cover, pagesi andii, p
16、ages1 to10, 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.BS2697:1976 BSI 11-1999 1 1 Scope This British Standard specifies certain dimension
17、s and accuracy requirements for non-topping finishing rack type gear cutters in the range140metric module inclusive, which are used in gear planing machines intended for the generation of spur and single helical gears having an involute form. It does not relate to cutters for double helical gears. O
18、ne accuracy test also relates to backplates. These cutters are intended for use in the production of metric module gears with a20 pressure angle and which comply with the requirements of ISO53 and ISO/R54 and BS436-2. This British Standard2697 includes two additional modules,3.25 and3.75. This stand
19、ard specifies two grades of tolerance for cutters, grade A and grade B. The following types of cutter are covered by this standard: Rectangular mounted cutters. Inclined mounted cutters. Inclined mounted parallelogram cutters. Details of information to be marked on cutters and information which is r
20、ecommended to be given when ordering cutters are included. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Terminology For the purposes of this British Standard the following terms apply. 3.1 rectangular mounted cutter this is a cutter
21、which is mounted in the cutter box at right angles to the direction of cut (see Figure 2) 3.2 inclined mounted cutter (often called Maag type) this is a cutter which is mounted in the cutter box inclined at an angle of6“ to a plane at right angles to the direction of cut (see Figure 3) 3.3 inclined
22、mounted parallelogram cutter this is a cutter which is mounted in a tool holder at an angle of3 . It has the additional feature that the bottom datum face is ground parallel to the top face, i.e.at an angle equal to the cutter top clearance angle the advantage of this type of tool is that it may be
23、re-sharpened and then replaced in the tool-holder without the need for making subsequent adjustments to the machine set-up. These cutters are sharpened on the full face i.e.front datum face see Figure 1(d) and Figure 4 3.4 general the general terms and notations used, common to gears and gear making
24、 tools, are taken from BS2519 1) Figure 1 illustrates the terminology applied to typical cutters 4 Tooth form Rack type cutters shall have teeth of such a form that they will be capable of generating gear teeth corresponding to the British Standard basic rack tooth profile given in BS436-2. The basi
25、c rack may be modified to the extent of the modifications shown in Figure 5. This aspect is subject to agreement between the customer and the manufacturer. 5 Dimensions 5.1 General. Dimensions of cutters shall comply with those given in Table 1 and Table 2 as appropriate. Cutters are also manufactur
26、ed and used outside the ranges of pitches and dimensions indicated for each type but these are not covered by this standard. However, by agreement between the purchaser and the manufacturer, essential features of this standard e.g.tolerances, may be applied to such other designs. 5.2 Position of fir
27、st tooth. This shall comply with the dimensions given in Table 3. 6 Accuracy requirements Cutters shall comply with the values given in Table 4. Backing plates shall comply with Table 4 test1, otherwise backing plates have not been toleranced specifically and they can therefore be regarded generally
28、 as having open dimensions but they shall not cause interference with the function of the cutter when in use. 1) Under revision.BS2697:1976 2 BSI 11-1999 7 Marking Cutters shall be marked with the following information where applicable. 8 Ordering instructions It is recommended that the purchaser sh
29、ould state: a) Quantity of cutters required. b) Type of cutter; rectangular mounted, inclined mounted or inclined mounted parallelogram cutter. c) Normal module. d) Grade of accuracy of cutter. e) Finishing (only). f) Dimension H (see Figure 2 or Figure 4) when applicable(640m n ). g) whether a back
30、ing plate is required. h) Basic rack if not to the requirements of this standard. i) Backing plate thickness. (The depth is determined by the type of cutter with which it will be used.) j) Number of this British Standard i.e.BS2697. Example (for standard cutter): One: rack type gear cutter; rectangu
31、lar mounted10m ngrade A finishing. One: backing plate . . . . thick to suit the above cutter. To comply with the requirements of BS2697. a) Normal module X m n b) Normal pressure angle ! n c) Cutting depth X CD d) Grade of accuracy of cutter A or B e) Number of this British Standard i.e.BS2697 f) Cu
32、tting face rake angle. Sharpen at X Makers identification mark or number, and cutter material, may also be added if desired. Figure 1 Rack type gear cutter; terminologyBS2697:1976 BSI 11-1999 3 Figure 2 Rectangular mounted cutter Figure 3 Inclined mounted cutter Figure 4 Inclined mounted parallelogr
33、am cutter NOTEThe basic gear rack is consistent with that given in BS436-2. Figure 5 20 pressure angle basic gear racktooth profile in terms of unit normal metric moduleBS2697:1976 4 BSI 11-1999 Table 1 Dimensions of rack type cutters (See Figure 2 and Figure 3) All dimensions are in millimetres. 1
34、2 3 4 5 6 7 8 9 10 11 12 13 Module m n Rectangular mounted Dimension H =34 see Figure 2 Rectangular mounted Dimension H =46 see Figure 2 Inclined mounted No. of teeth Overall depth Thickness Overall length min. No. of teeth Overall depth Thickness Overall length min. No. of teeth Overall depth Thick
35、ness Overall length min. 1 1.125 1.25 18 16 14 55 55 55 25 25 25 60 60 60 24 24 24 48 48 48 20 20 20 76 85 94 1.375 1.5 1.75 13 12 10 55 55 55 25 25 25 60 60 60 24 24 24 48 48 48 20 20 20 104 113 132 2 2.25 2.5 10 9 9 55 55 55 25 25 25 62 64 70 21 19 19 48 48 48 20 20 20 132 135 150 2.75 3 3.25 9 9
36、8 55 55 55 25 25 25 77 85 81 18 18 17 48 48 48 20 20 20 156 170 174 3.5 3.75 4 8 8 8 55 55 55 25 25 25 88 94 99 16 15 14 48 48 48 20 20 20 176 177 176 4.5 5 5.5 7 7 7 55 55 55 25 25 25 97 108 120 12 11 10 48 48 48 20 20 20 170 173 174 6 6.5 7 7 7 7 60 60 60 25 25 25 129 140 151 10 10 9 70 80 80 25 3
37、8 38 186 201 196 8 8 8 58 58 58 20 20 20 153 165 176 8 9 10 7 7 7 60 70 70 25 25 25 172 194 216 8 7 7 80 80 80 38 38 38 197 194 216 7 6 6 70 70 70 23 23 23 176 169 187 11 12 14 6 6 6 70 80 80 25 25 25 202 221 260 6 6 6 80 90 90 38 38 38 202 221 260 7 6 5 80 90 90 23 23 23 241 224 216 16 18 20 5 5 5
38、80 90 90 25 25 25 244 273 304 6 5 5 100 100 100 38 38 38 294 273 304 5 4 4 100 100 110 23 23 23 246 219 243 22 25 28 4 4 105 105 25 25 264 302 5 5 4 115 115 130 38 38 38 334 380 337 4 3 3 130 130 150 23 23 23 266 225 249 32 36 40 4 4 4 130 150 150 38 50 50 385 434 481 BS2697:1976 BSI 11-1999 5 Table
39、 2 Dimensions of rack type cutters, inclined mounted parallelogram type (See Figure 4) All dimensions are in millimetres. 1 2 3 4 5 6 7 8 9 Module m n Inclined mounted parallelogram type Dimension H =34 see Figure 4 Inclined mounted parallelogram type Dimension H =46 see Figure 4 No. of teeth Overal
40、l depth Thickness Overall length min. No. of teeth Overall depth Thickness Overall length min. 1 1.125 1.25 18 16 14 60 60 60 25 25 25 60 60 60 1.375 1.5 1.75 13 12 10 60 60 60 25 25 25 60 60 60 2 2.25 2.5 10 9 9 60 60 60 25 25 25 62 64 70 2.75 3 3.25 9 9 8 60 60 60 25 25 25 77 85 81 3.5 3.75 4 8 8
41、8 60 60 60 25 25 25 88 94 99 4.5 5 5.5 7 7 7 60 60 60 25 25 25 97 108 120 6 6.5 7 7 7 7 60 70 70 25 25 25 129 140 151 10 10 9 70 80 80 25 38 38 186 201 196 8 9 10 7 7 7 70 70 70 25 25 25 172 194 216 8 7 7 80 80 80 38 38 38 197 194 216 11 12 14 6 6 6 80 80 80 25 25 25 202 221 260 6 6 6 90 90 90 38 38
42、 38 202 221 260 16 18 20 5 5 5 90 90 105 25 25 25 244 273 304 6 5 5 100 100 115 38 38 38 294 273 304 22 25 28 4 4 105 105 25 25 264 302 5 5 4 115 115 130 38 38 38 334 380 337 32 36 40 4 4 4 130 150 150 38 50 50 385 434 481BS2697:1976 6 BSI 11-1999 Table 3 Dimensions to position of first tooth on all
43、 types of cutters (See Figure 6) Figure 6 Position of first tooth All dimensions are in millimetres. Module m n Dimension “X” 0.04 Module m n Dimension “X” 0.04 1 1.125 1.25 3.0 4.0 4.0 6 6.5 7 8.0 9.0 10.0 1.375 1.5 1.75 4.0 6.0 5.0 8 9 10 11.0 12.0 14.0 2 2.25 2.5 3.0 4.0 4.0 11 12 14 15.0 16.0 20
44、.0 2.75 3 3.25 4.0 5.0 5.0 16 18 20 22.0 24.0 26.0 3.5 3.75 4 6.0 6.0 6.0 22 25 28 29.0 33.0 37.0 4.5 5 5.5 6.0 7.0 8.0 32 36 40 42.0 48.0 53.0BS 2697:1976 BSI 11-1999 7 Table 4 Accuracy requirements for rack type gear cutters 1 2 3 4 5 6 7 Test no. Diagram Element Object of test Tolerance (unit0.00
45、1mm) Pitch range module m n Grade Grade A Grade B 1 Outside faces Parallelism of front face to back datum face. This test also applies to backing plates. 12 23.5 3.56 610 1016 1625 2540 12 14 17 21 28 40 60 24 28 34 42 56 80 120 2 Squareness of bottom datum face to back datum face. 140 1504m/300mm 3
46、004m/300mm 3 This test only applies to rectangular mounted cutters. Cutting face variation from designed angle measured over cutting depth. 12 23.5 3.56 610 1016 1625 2540 12 14 17 21 28 40 60 24 28 34 42 56 80 120 4 This test only applies to inclined mounted parallelogram cutters. Parallelism of cl
47、earance angle to bottom datum face. 12 23.5 3.56 610 1016 1625 2540 12 14 17 21 28 40 60 24 28 34 42 56 80 120BS 2697:1976 8 BSI 11-1999 Table 4 Accuracy requirements for rack type gear cutters 1 2 3 4 5 6 7 Test no. Diagram Element Object of test Tolerance (unit0.001mm) Pitch range module m n Grade
48、 Grade A Grade B 5 Outside faces Parallelism of tips of teeth to bottom datum face. 12 23.5 3.56 610 1016 1625 2540 12 14 17 21 28 40 60 24 28 34 42 56 80 120 6 Tooth spacing Variation in spacing tooth to tooth. 12 23.5 3.56 610 1016 1625 2540 5 6 7 9 12 17 25 10 12 14 18 24 34 50 7 Variation in spa
49、cing over any3 consecutive teeth. 12 23.5 3.56 610 1016 1625 2540 7 8 9 11 15 21 32 14 16 18 22 30 42 64BS 2697:1976 BSI 11-1999 9 Table 4 Accuracy requirements for rack type gear cutters 1 2 3 4 5 6 7 Test no. Diagram Element Object of test Tolerance (unit0.001mm) 8 Pitch range module m n Grade Grade A Grade B Tooth Thickness. M
