1、BRITISH STANDARD BS 1296-4: 1978 Specification for Single point cutting tools Part 4: Ground high speed steel tool bits UDC 621.9.025:669.14.018.252.3BS1296-4:1978 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe
2、 authority of the Executive Board on 31January1978 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference MEE/83 Draft for comment 76/72749 ISBN 0 580 09898 2 Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction th
3、is British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Department of Trade (Marine Division) Association of Consulting Engineers Department of Transport Association of
4、 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 Electrical and
5、 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 Engineers
6、Manufacturers Association London Transport Executive British Pump Manufacturers Association Machine Tool Trades Association* British Steel Corporation* Ministry of Defence* Chartered Institution of Building Services National Coal Board Crown Agents for Oversea Governments and Process Plant Associati
7、on Administrations Railway Industry Association of Great Britain Department of the Environment Telecommunication Engineering and Department of Industry, Mechanical Manufacturing Association (TEMA) Engineering The Society of Motor Manufacturers and Department of Industry, National Engineering Traders
8、 Limited Laboratory Water-tube Boilermakers Association 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: High Speed Steel Tool Kit Association Welding Manufact
9、urers Association Welded Tool Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS1296-4:1978 BSI 02-2000 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Round section tool bits 1 4 Square section tool bit
10、s 1 5 Rectangular section tool bits 2 Publications referred to Inside back coverBS1296-4:1978 ii BSI 02-2000 Foreword This Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. It relates solely to dimensions and tolerances for ground
11、high speed steel tool bits and is essentially based on ISO5421:1977. It differs from ISO5421 with regard to tolerances for round sections, where the British Standard shows a tolerance of h12, when the ISO standard requirement is h9. It also differs with regard to the tolerance on the length of the t
12、hree types of tool bit inasmuch as the ISO standard shows 2mm against+0,3mm for the British Standard. Further differences occur where the British Standard permits square section tool bits to have slanted ends and does not include trapezoidal sections, which are dealt with in the ISO standard. A Brit
13、ish 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 document comprises a fron
14、t cover, an inside front cover, pagesi andii, pages1 and 2, 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.BS1296-4:1978 BSI 02-2000 1 1 Scope
15、 This Part of this British Standard relates to ground high speed steel tool bits and specifies dimensions and tolerances for tool bits with round, square or rectangular sections. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Round sec
16、tion tool bits The following are dimensions and tolerances for tool bits with round sections. 4 Square section tool bits The following are dimensions and tolerances for tool bits with square sections. d h12 a 63 80 100 160 200 4 X X X 5 X X X 6 X X X X 8 X X X 10 X X X X 12 X X X 16 X X X 20 X a See
17、 BS4500-1:1969 L +0 3 b h13 a h h13 a 63 80 100 160 200 4 4 X 5 5 X 6 6 X X X X X 8 8 X X X X X 10 10 X X X X X 12 12 X X X X X 16 16 X X X 20 20 X X 25 25 X NOTEThese tool bits may be supplied with slanted ends as indicated above. a See BS4500-1:1969 L +0 3BS1296-4:1978 2 BSI 02-2000 5 Rectangular
18、section tool bits The following are dimensions and tolerances for tool bits with rectangular sections. b h13 a h h13 a 100 160 200 4 6 X 8 X 5 8 X 10 X 6 10 X X 12 X X 8 12 X X 16 X X 10 16 X X 20 X X 12 20 X X 25 X 16 25 X Second choice dimensions are as follows. Dimensions are in millimetres. b h1
19、3 a h h13 a 6 4 14 10 140 120 a See BS4500-1:1969 L +0 3 L +0 3BS1296-4:1978 BSI 02-2000 Publications referred to BS4500, ISO limits and fits. BS4500-1, General, tolerances and deviations. ISO5421, Ground high speed steel tool bits. BS 1296-4: 1978 BSI 389 Chiswick High Road London W4 4AL BSIBritish
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