1、BRITISH STANDARD BS5246:1976 Incorporating Amendment No.1 Specification for Pinion type cutters for spur gears 1 to8 metric module UDC621.914.6:621.833BS5246:1976 This British Standard, having been approved by the MechanicalIndustry StandardsCommittee, was published under the authority ofthe Executi
2、ve Board on 27February1976 BSI12-1999 First published as BS2887 August1957 First revision as BS5246 February1976 The following BSI references relate to the work on this standard: Committee reference MEE/127 Draft for comment73/32531 DC ISBN 0 580 08576 7 Co-operating organizations The Mechanical Eng
3、ineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: Associated Offices Technical Committee Department of Trade Association of Consulting
4、 Engineers Electricity Supply Industry in England and Association of Hydraulic Equipment Wales Manufacturers Ltd. Engineering Equipment Users Association Association of Mining Electrical and Federation of Manufacturers of Construction Mechanical Engineers Equipment and Cranes British Compressed Air
5、Society Institution of Gas Engineers British Electrical and Allied Manufacturers Institution of Heating and Ventilating Association Engineers British Gas Corporation Institution of Mechanical Engineers British Gear Manufacturers Association* Institution of Plant Engineers British Internal Combustion
6、 Engine Institution of Production Engineers* Manufacturers Association London Transport Executive British Mechanical Engineering Confederation Machine Tool Trades Association* British Pump Manufacturers Association Ministry of Defence* British Steel Corporation National Coal Board British Steel Indu
7、stry Process Plant Association Crown Agents for Oversea Governments and Railway Industry Association of Great Britain Administrations Royal Institute of British Architects Department of Employment (HM Factory Society of Motor Manufacturers and Inspectorate) Traders Ltd. Department of the Environment
8、 Telecommunication Engineering and Department of Industry Mechanical Manufacturing Association Engineering Department of Industry National Engineering Laboratory* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the follo
9、wing, were directly represented on the committee entrusted with the preparation of this British Standard: 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 Engine
10、ering Manufacturers and Shipbuilders Amendments issued since publication Amd. No. Date of issue Comments 2100 September 1976 Indicated by a sideline in the marginBS5246:1976 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Terminology 1
11、 4 Tooth form 1 5 Dimensions 1 6 Bore 2 7 Provision of datum cylinders 2 8 Tolerances 2 9 Marking 2 10 Instructions for ordering 2 Appendix A Incorrect gear action 12 Figure 1 Cutter terms 1 Figure 2 Disc gear cutter 2 Figure 3 Extended hub gear cutter 5 Figure 4 Screwed hub gear cutter 6 Figure 5(a
12、) Parallel shank gear cutter 6 Figure 5(b) Large stub taper shank gear cutter 6 Figure 5(c) No.2 Morse stub taper shank gear cutter 7 Table 1(a) Disc gear cutter dimensions (31.75 mm and 44.45 mm diameter bore) 3 Table 1(b) Disc gear cutter dimensions (58.738 mm diameter bore, 10 mm nominal size, wi
13、th optional keyway) 4 Table 2 Extended hub gear cutter dimensions (31.75 mm and 44.45 mm diameter bore) 5 Table 3 Screwed hub gear cutter dimensions 6 Table 4 Dimensions of parallel and large stub and No.2Morsestubtapershank gear cutters 7 Table 5 Dimensions of bore 7 Table 6 Accuracy tests 8 Public
14、ations referred to Inside back coverBS5246:1976 ii BSI 12-1999 Foreword This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and is one of a number dealing with gear cutting tools. This edition is a revision of the1957 edition of BS28
15、87 but in accordance with the UK policy of metrication, diametral pitch cutters have been replaced by metric module cutters. BS2887 is therefore withdrawn. It should be noted that, due to established world wide usage, nominal bore sizes in inch units of1 1 / 4 , 1 3 / 4 and2 5 / 16 have been directl
16、y converted into millimetres. 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
17、pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to12, 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.
18、BS5246:1976 BSI 12-1999 1 1 Scope This British Standard specifies certain dimensions and accuracy requirements for non-topping pinion type finishing cutters for generating involute spur gear teeth of1 to8 metric module. The following types of cutter are covered by this standard. Disc see Table 1(a)
19、and Table 1(b). Extended hub (see Table 2). Screwed hub (see Table 3). Parallel shank (see Table 4). Large stub taper shank (see Table 4). No.2 Morse stub taper shank (see Table 4). These cutters are generally intended for the production of metric module gears which comply with the requirements of I
20、SO53 and ISO54 and BS436-2. This standard, BS5246, includes two additional modules,3.25 and3.75. Two tolerance grades are given. Grade AA. Cutters for the production of gears to fine tolerances. Grade A. Cutters for the production of gears for general purposes. NOTEGrade AA is applicable to all the
21、cutters illustrated except the screwed hub type shown in Figure 5. Details of the markings recommended for pinion type cutters and information to be given when ordering standard cutters are included. 2 References The titles of the British Standard and International Standards referred to in this stan
22、dard are listed on the inside back cover. 3 Terminology 3.1 normal module, m n the quotient of the normal pitch, expressed in mm, by the number ; 3.2 General. The general terms used, common to gears and gear forming tools, are taken from BS2519 1) . Notations are as given in BS2519 1) . Figure 1 ill
23、ustrates the terminology applied to a typical disc type cutter. 4 Tooth form Pinion 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 shown in BS436-2 except that slight changes in profile, r
24、oot fillet and root clearance of the gear teeth will occur during the life of the cutter. The actual dimensions of the following elements of the cutter shall be so related that when cutting a basic rack to the standard tooth thickness, the standard root clearance will be maintained as a minimum over
25、 the first75% of the useful face width of the cutter teeth: a) outside diameter, b) tooth thickness, c) side relief angle, d) top relief angle. NOTEWith certain combinations of gear and cutter sizes, gears produced by this process will give rise to incorrect tooth action. See Appendix A. 5 Dimension
26、s Dimensions for the cutters listed shall comply with those given in Table 1 to Table 4 as appropriate. Cutters are also manufactured and used outside the range of pitches indicated for each type but these are not covered by this standard. However, by agreement between the purchaser and manufacturer
27、, essential features of this standard, e.g.tolerances, may be applied to such other designs. For bore dimensions see clause6. 1) Under revision. Will also embody notations given in ISO/R701. Figure 1 Cutter termsBS5246:1976 2 BSI 12-1999 6 Bore Each end of the bore shall be broken with a small chamf
28、er or radius not exceeding1mm and the bore shall be finished parallel. The dimensions of the bore shall comply with those given in Table 5. 7 Provision of datum cylinders 7.1 For grade AA cutters. All grade AA cutters shall have a datum cylinder as shown in Figure 1, Figure 2, Figure 3 and Figure 5.
29、 7.2 For grade A disc cutters. A datum cylinder as in7.1 above may be incorporated by arrangement between the purchaser and the manufacturer. Other grade A cutters do not normally have a datum cylinder. 8 Tolerances The tolerances appropriate to each type and grade of pinion cutter are given in Tabl
30、e 6. In general, the tolerances for grade AA cutters apply only to the types referred to in Table 1(a), Table 1(b), Table 2 and Table 4. 9 Marking Recommendations for the information to be marked on pinion type gear cutters are given below. Makers identification mark or number, and cutter material m
31、ay also be added if desired. 10 Instructions for ordering Information required by the suppliers of pinion cutters, which should be stated when ordering, is tabulated below. Quantity required. Type of cutter. Normal module. Grade of accuracy of cutter. Nominal cutter size. Diameter of bore or size an
32、d type of shank. Number of this British Standard. Example One: Pinion type disc cutter,3 metric module, Grade A,100mm nominal size,31.75mm bore, BS5246. Normal module xm n Normal pressure angle at reference cylinder n Number of teeth xz Grade of accuracy of cutter . . . Cutting depth x CD Number and
33、 year of this British Standard BS5246:1975 Figure 2 Disc gear cutterBS5246:1976 BSI 12-1999 3 Table 1(a) Disc gear cutter dimensions (see Figure 2) (31.75mm and44.45mmdiameterbore) All dimensions are in mm. 1 2 3 4 5 6 7 Module m n 75mm nominal cutter size 100mm nominal cutter size Web thickness Cha
34、mfer Number of teeth z Width W (without datum cylinder) (Seenote1) Number of teeth z Width W (without datum cylinder) (Seenote1) T C 1 1.125 1.25 1.375 1.5 1.75 76 68 61 56 51 43 16 16 16 17.5 17.5 19 100 88 80 72 66 58 16 16 16 19 19 19 8 1.5 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.5 5 38 34 30 28 25 2
35、3 22 20 19 17 22 22 22 22 22 25 25 25 25 25 50 44 40 36 33 31 29 27 25 22 20 22 22 22 22 22 25 25 25 25 25 25 10 3 5.5 6 6.5 7 8 18 17 16 15 13 29 29 29 29 29 12 Diameter of bore B 31.75 31.75 or44.45 Counterbore diameter d min. (See note2) 53 67 See also Appendix A. NOTE 1When a datum cylinder is p
36、rovided this dimension will need to be increased by3mm. NOTE 2The counterbore may be tapered or parallel.BS5246:1976 4 BSI 12-1999 Table 1(b) Disc gear cutter dimensions (see Figure 2) (58.738mm diameter bore,100mm nominal size, with optional keyway) All dimensions are in mm. 1 2 3 4 5 6 7 Module m
37、n No. of teeth z Width W (without datum cylinder) (Seenote1) Web thickness Counterbore diameter d min. (Seenote2) Size of optional keyway in bore Chamfer C 1 1.125 1.25 1.375 1.50 1.75 100 88 80 72 66 58 25 1.5 2 2.25 2.5 2.75 3 50 44 40 36 33 13 3.25 3.5 3.75 4 4.5 31 29 27 25 23 29 78mm min. 9.6wi
38、deo 3.2deep 3.0 5 5.5 21 19 6 6.5 7 8 18 17 16 14 30.5 30.5 32 33.5 15 See also Appendix A. NOTE 1When a datum cylinder is provided this dimension will need to be increased by3mm. NOTE 2The counterbore may be tapered or parallel.BS5246:1976 BSI 12-1999 5 Table 2 Extended hub gear cutter dimensions (
39、see Figure 3) Figure 3 Extended hub gear cutter (31.75mm and44.45mm diameter bore) All dimensions are in mm. 1 2 3 4 5 6 7 Module m n 75mm nominal cutter size 100mm nominal cutter size Web thickness Chamfer Number of teeth z Width W Number of teeth z Width W T C 1 1.125 1.25 1.375 1.5 1.75 76 68 61
40、56 51 43 16 16 16 17.5 17.5 19 100 88 80 72 66 68 16 16 16 19 19 19 9 1.5 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.5 5 38 34 30 28 25 23 22 20 19 17 22 22 22 22 22 25 25 25 25 25 50 44 40 36 33 31 29 27 25 22 20 22 22 22 22 22 25 25 25 25 25 25 11 3 5.5 6 6.5 7 8 18 17 16 15 13 29 29 29 29 29 13 Diameter
41、 of bore B 31.75 31.75 or44.45 Counterbore diameter d min. (See note) 53 67 See also Appendix A. NOTEThe counterbore may be tapered or parallel.BS5246:1976 6 BSI 12-1999 Table 3 Screwed hub gear cutter dimensions (see Figure 4) Figure 4 Screwed hub gear cutter All dimensions are in mm. 1 2 3 4 5 Mod
42、ule m n No. of teeth z Reference circle diameter Width W Chamfer C 1 1.125 1.25 1.375 1.50 1.75 50 45 40 38 35 30 50 50.625 50 52.25 52.5 52.5 16 16 16 19 19 19 1.5 2 2.25 2.50 2.75 3 28 25 25 23 21 56 56.25 62.5 63.25 63 22 22 22 22 22 3 NOTEThe counterbore may be tapered or parallel. Figure 5(a) P
43、arallel shank gear cutter Figure 5(b) Large stub taper shank gear cutterBS5246:1976 BSI 12-1999 7 Table 4 Dimensions of parallel and large stub and No.2 Morse stub taper shank gear cutters (see Figure 5) Table 5 Dimensions of bore Figure 5(c) No.2 Morse stub taper shankgear cutter All dimensions are
44、 in mm. 1 2 3 4 Module m n Reference circle diameter Width W min. Number of teeth z 1 1.125 1.25 1.375 1.50 1.75 25 22.5 20 24.75 30 28 8 25 20 16 18 20 16 2 2.25 2.50 2.75 3 28 29.25 30 33 36 10 14 13 12 12 12 All dimensions are in mm. 1 2 3 Nominal diameter Limits of size Tolerance H4 min. max. 31
45、.75 44.45 58.738 31.750 44.450 58.738 31.757 44.457 58.746BS 5246:1976 8 BSI 12-1999 Table 6 Accuracy tests Tolerance unit0.001mm unless otherwise stated. 1 2 3 4 5 6 7 8 9 10 Test Typical test arrangement (Seenotes4 and7) Element Test Nominal cutter size Grade of cutter Tolerance Module W 1u 2 2u 3
46、.5 3.5u 6 6u 8 mm G1 Datum face (Seenote2) Flatness of datum face (concave only) Up to75 AA 3 A 5 100 AA 3 A 5 G2 Datum face (See note2) Axial run-out Up to75 AA 3 A 5 100 AA 5 A 8 G3 Inner face (See note2) Parallelism of inner face with datum face All sizes AA 3 A 5 G4 Cutting face Accuracy of cutt
47、ing rake angle(5 nominal) All sizes AA and A +0 0.25 G5 Cutting face Axial run-out Up to75 AA and A 8 100 AA and A 10 BS 5246:1976 BSI 12-1999 9Table 6 Accuracy tests Tolerance unit0.001mm unless otherwise stated. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Test Typical test arrangement
48、 (See notes4 and7) Element Test Nominal cutter size Grade of cutter Tolerance Module W 1u 2 2u 3.5 3.5u 6 6u 8 Reference diameter u 32 32 u 50 50 u 80 80 u 125 u 32 32 u 50 50 u 80 80 u 125 50 u 80 80 u 125 80 u 125 G6 Outside diameter Run-out, relative to bore All sizes AA 8 8 8 8 8 8 8 8 8 8 8 A 1
49、3 13 13 13 13 13 13 13 13 13 13 G7 Datum cylinder of disc type cutter Run-out, relative to bore All sizes AA 5 5 6 6 5 5 6 6 6 6 6 A 5 5 6 6 5 5 6 6 6 6 6 G8 Tooth (seenotes 3,5 and6) Profile error All sizes AA A 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6BS 5246:1976 10 BSI 12-1999Table 6 Accuracy tests Tolerance unit0.001mm unless otherwise stated. 1 2 3 4 5 6 7 8 9 10 11
