1、BRITISH STANDARD BS2459:1974 Incorporating Amendment No.1 Specification for Set squares (fixedandadjustable) for drawing office use UDC 744.34:531.747.1BS2459:1974 This British Standard, having been approved by the Office Machines and Equipment IndustryStandards Committee,was published underthe auth
2、orityof the Executive Boardon 31 December 1974 BSI 09-1999 First published April 1954 First revision December 1974 The following BSI references relate to the work on this standard: Committee reference OME/8 Draft for comment 72/61393 ISBN 0 580 08159 1 Co-operating organizations The Office Machines
3、and Equipment Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and industrial organizations. Association of Certified and Corporate Accountants Business Equipment Trade Association Civil Se
4、rvice Department Confederation of British Industry Department of the Environment* Drawing Office Material Manufacturers and Dealers Association* HM Stationery Office Institute of Chartered Accountants in England and Wales Institute of Chartered Secretaries and Administrators Institute of Cost and Wo
5、rks Accountants Institute of Administrative Management Joint Advisory Committee on Local Authority Purchasing Office Machines and Equipment Federation The Government department and industrial organization marked with an asterisk in the above list, together with the following, were directly represent
6、ed on the committee entrusted with the preparation of this British Standard. County Surveyors Society Incorporated Association of Architects and Surveyors Institution of Professional Civil Servants Ministry of Defence (Navy) Ordnance Survey Royal Institute of Chartered Surveyors Society of Motor Man
7、ufacturers and Traders Ltd. Amendments issued since publication Amd. No. Date of issue Comments 2190 January1977 Indicated by a sideline in the marginBS2459:1974 BSI 09-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Materials 1 4 General req
8、uirements 1 5 Dimensions and tolerances 1 6 Marking 1 Figure1Typical markings oil graduated are of adjustable set squares 2 Table1Preferred sizes for set squares 2 Publications referred to Inside back coverBS2459:1974 ii BSI 09-1999 Foreword This British Standard has been prepared under the authorit
9、y of the Office Machines and Equipment Industry Standards Committee as one of a series in a specialized category needed to meet the requirements of drawing office equipment as distinct from general office equipment. In this revision the designation of sizes follows continental practice of referring
10、to the hypotenuse of 45 and adjustable set squares and to the long rectangular side of 60 set squares. A new, metric range of preferred sizes is specified. NOTEA sectional list of other British Standards in this field is published separately as SL37“Drawing practice”. Certification. Attention is dra
11、wn to the certification facilities described on the inside back cover of this standard. 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
12、itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1and2, 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 in
13、dicated in the amendment table on the inside front cover.BS2459:1974 BSI 09-1999 1 1 Scope This British Standard specifies requirements for set squares of the fixed angle(45 and60 ) and adjustable types, made from transparent plastics material, for drawing office use. 2 References The titles of the
14、British Standards referred to in this standard are listed on the inside back cover. 3 Materials 3.1 Set squares shall be made from transparent plastics material complying with the following requirements. 3.1.1 The change in any linear dimension shall not exceed1% for a variation in ambient temperatu
15、re from0Cto38 C and in relative humidity from0to100%. 3.1.2 The material shall possess toughness, hardness and flexibility sufficient to permit constant handling in use without a degree of deterioration of the surface, loss of transparency, distortion or damage to the working edge such as to render
16、it unserviceable. 3.2 The arc or quadrant of adjustable set squares shall be made from a plastics material meeting the requirements of3.1, or a corrosion resistant metal or a metal rendered corrosion resistant in accordance with BS1224, BS1706 or BS3597. 3.3 The hinge, clamping screw and nut shall b
17、e made from a corrosion resistant metal or a metal rendered corrosion resistant in accordance with BS1224, BS1706, BS3382 or BS3597. 4 General requirements 4.1 All set squares shall have working edges that are straight within a tolerance zone0.25mm wide per200mm of length. The edges may be relieved
18、by bevelling or other means to leave a vertical edge thickness of not less than1mm. 4.2 Set squares of the fixed angle type shall have a centre hole or holes or open centres. 4.3 In set squares of the adjustable type, the following requirements shall apply. 4.3.1 The adjustable arm shall have a work
19、ing movement of not less than 45 and when fully closed its working edge shall be at 45 to the base. 4.3.2 The graduated arc shall be rigidly secured to, or form an integral part of, the adjustable arm, and shall be graduated radially in degrees and half degrees with respect to the base. It shall be
20、figured at0 , 10 , 20 , 30 and40 in a clockwise direction, and at45 , 50 , 60 , 70 , 80 and90 in an anti-clockwise direction. All divisions shall be defined by fine clear lines of uniform depth and thickness, normal to the edge, with a difference in length between the degree and half-degree lines. L
21、ines shall extend to the edge of the are unless a hairline index acting over the division lines is used. All markings shall be filled with a material of strongly contrasting colour. Typical markings are shown inFigure 1. 4.3.3 Special care should be taken to avoid confusion between figures of simila
22、r form. Reference should be made to BS3693-1. 4.3.4 The set squares shall be provided with a datum and a suitable clamping screw and nut. 5 Dimensions and tolerances 5.1 Preferred dimensions are set out inTable 1. The sizes refer to the length of the hypotenuse of45 set squares and to the long recta
23、ngular side of60 set squares. 5.2 The maximum allowable tolerance on any fixed angle shall be 2. 5.3 The maximum allowable tolerance on any angle indicated by the graduations of the arc of an adjustable type shall be 4. 5.4 Set squares shall be flat within a tolerance zone1.0mm wide per300mm of leng
24、th. 6 Marking Where compliance with the requirements of this British Standard is claimed, the set square shall be legibly and indelibly marked with: a) the number of this British Standard, i.e. BS2459; b) the name or trade mark of the manufacturer.BS2459:1974 2 BSI 09-1999 Table 1 Preferred sizes fo
25、r set squares Figure 1 Typical markings on graduated arc of adjustable set squares Type Nominal size Minimum thickness mm mm 45 fixed angle 60e fixed angle 250 300 350 400 250 300 350 400 450 2.0 adjustable 250 300 350 3.0 BS2459:1974 BSI 09-1999 Publications referred to This standard makes referenc
26、e to the following British Standards: BS 1224, Electroplated coatings of nickel and chromium. BS 1706, Electroplated coatings of cadmium and zinc on iron and steel. BS 3382, Electroplated coatings on threaded components. BS 3382-1, Cadmium on steel components. BS 3382-2, Zinc on steel components. BS
27、 3382-3, Nickel or nickel plus chromium on steel components. BS 3382-4, Nickel or nickel plus chromium on copper and copper alloy (including brass) components. BS 3382-5, Tin on copper and copper alloy (including brass) components. BS 3597, Electroplated coatings of 65/35 tin-nickel alloy. BS 3693,
28、Recommendations for the design of scales and indexes. BS 3693-1, Instruments of bold presentation and for rapid reading. BSI Certification Trade Mark The Kitemark The Kitemark is the registered certification trade mark of the British Standards Institution. A licence to use the Kitemark on or in rela
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