1、BRITISH STANDARD BS3322:1981 Specification for Carpenters squares and bevels UDC 674.051:531.747BS3322:1981 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 30 N
2、ovember1981 BSI 11-1999 First published December1960 First revision November1981 The following BSI reference relates to the work on this standard: Committee reference MEE/120 Draft for comment 80/76917 DC ISBN 0 580 12392 8 Cooperating organizations The Mechanical Engineering Standards Committee, un
3、der whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Department of Trade(Marine Division) Association of Consulting Engineers Department of Transport Association of Hydraulic Equipment Electricity Supply Indust
4、ry 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 Allied Manufacturers Health and Safety Execut
5、ive 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* Manufacturers Association Lloyds Register of S
6、hipping British Pump Manufacturers Association London Transport Executive British Steel Corporation Machine Tool Industry Research Association British Steel Industry Ministry of Defence* Cbmpe National Coal Board* Chartered Institution of Building Services Oil Companies Materials Association Crown A
7、gents for Oversea Governments and Process Plant Association Administrations Society of Motor Manufacturers and Department of Industry(Mechanical Traders Limited Engineering) Telecommunication Engineering and Department of Industry(National Manufacturing Association(TEMA) Engineering Laboratory) Wate
8、r-tube Boilermakers Association Department of the Environment(PSA) The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Institute of Certified Ca
9、rpenters Furniture, Timber and Allied Trades Union Federation of British Hand Tool Post Office Manufacturers Amendments issued since publication Amd. No. Date of issue CommentsBS3322:1981 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3
10、Definitions 1 4 Materials 1 5 Heat treatment and hardness 1 6 Manufacture 1 7 Accuracy 1 8 Dimensions 2 9 Finish 2 10 Marking 2 11 Performance tests 2 Appendix A Recommended materials for carpenters squares and bevels 7 Appendix B Methods of testing accuracy 7 Figure 1 Error in lateral squareness 2
11、Figure 2 Carpenters squares 3 Figure 3 Carpenters sliding bevels 4 Figure 4 Test for blade security of carpenters squares 5 Figure 5 Test for blade security of carpenters bevels 6 Table 1 Nominal dimensions of carpenters squares 3 Table 2 Nominal dimensions of carpenters sliding bevels 3 Table 3 Pos
12、ition of load application for blade security of carpenters squares 4 Publications referred to Inside back coverBS3322:1981 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. This standard is a revision of the1960edit
13、ion, which is withdrawn. It has been metricated and its object is to ensure that each tool capable of passing the tests given in clause11 will give accurate service and satisfactory life under normal conditions of use. A British Standard does not purport to include all the necessary provisions of a
14、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, pages1 to8, an inside back co
15、ver 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.BS3322:1981 BSI 11-1999 1 1 Scope This British Standard specifies the materials, nominal sizes, dimensions, qual
16、ity, finish and testing of carpenters squares and carpenters sliding bevels. Recommended materials are shown in Appendix A and methods of testing accuracy are given in Appendix B. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definiti
17、ons For the purposes of this British Standard the following definitions apply. 3.1 polished the smooth finish produced by coating with polish or a lacquer applied by hand, by spraying or by dipping to seal the wood against moisture content change 3.2 error in parallelism the difference between the m
18、aximum and minimum widths NOTEGeneral layout and terminology are shown in Figure 2 andFigure 3. 4 Materials The components of carpenters squares and bevels shall be manufactured from materials that are capable of complying with the requirements of clauses5 and11. NOTERecommended materials are given
19、in Appendix A. 5 Heat treatment and hardness Blades shall be hardened and tempered, (seeclause4), to have a hardness in the range418 HV5 to460 HV5, when tested in accordance with BS427-1, using a machine which has been verified in accordance with BS427-2. 6 Manufacture 6.1 General 6.1.1 All working
20、faces and edges, together with components, shall be smoothly finished. When plates, tips and spacers are used they shall be smoothly finished, and flush with adjacent surfaces. 6.2 Squares 6.2.1 Facing plates on wooden stocks shall be positively secured to the stock. 6.2.2 No permanent set shall res
21、ult on any square when tested in accordance with11.1. 6.2.3 The blade and stock of a square shall remain positively and permanently fixed when tested in accordance with11.2. NOTEBlades may be graduated on the working edge(s). 6.2.4 The blade of a square shall be set back from the outer face of the s
22、tock by0.4mm to4mm, (seeFigure 2). 6.3 Bevels 6.3.1 Tips and spacers on wooden stocks for bevels shall be positively secured to the stock. 6.3.2 No permanent set shall result on any bevel blade when tested in accordance with11.1. 6.3.3 Means shall be provided for positively locking the bevel blade i
23、n any position. The major diameter of the screw used for this purpose shall be not less than that for an M5 screw thread,(seeBS3643-1). The locking screw shall not protrude beyond the stock working face on at least one side. Locking of the blade shall be verified by carrying out the test in11.3, whe
24、n, after removal of the mass, (seeFigure 5), the blade shall have remained at90 to the stock. 7 Accuracy 7.1 Straightness of working faces and working edges 7.1.1 Squares. The difference between the highest and lowest points of a working face shall not exceed an amount equal to0.01mm per10mm of stoc
25、k length. The difference between the highest and lowest points of a working edge shall not exceed0.05mm. 7.1.2 Bevels. The difference between the highest and lowest points of a stock working edge shall not exceed0.25mm. The difference between the highest and lowest points of a blade working edge sha
26、ll not exceed0.125mm. NOTEAn optional test for checking the straightness of working faces and working edges of carpenters squares and bevels is given inB.1. 7.2 Parallelism of working faces and working edges 7.2.1 Squares. The maximum error in parallelism between the working and outer face shall not
27、 exceed0.38mm and between working edges shall not exceed0.1mm. When the blade is graduated the tolerance on the nominal length shall be 1mm at a temperature of20 C. The positional error of the whole scale relative to the selected face shall be1mm at a temperature of20 C.BS3322:1981 2 BSI 11-1999 7.2
28、.2 Bevels. The maximum error in parallelism between the stock working edges shall not exceed0.38mm and between the blade working edges shall not exceed0.18mm. NOTEAn optional test for checking the parallelism of working faces and working edges of carpenters squares and bevels is given inB.2. 7.3 Squ
29、areness 7.3.1 The inner working edge of the blade of each square shall be square to the working face of the stock, subject to a maximum tolerance equal to0.01mm per10mm of blade length when measured at the tip of the blade. NOTEAn optional test for checking the squareness of carpenters squares is gi
30、ven inB.3. 7.3.2 The maximum departure from lateral squareness(seeFigure 1) of the blade of each square, with reference to the working face of the stock, shall not exceed an amount equal to0.05mm per10mm of blade length when measured at the tip of the blade. 8 Dimensions The nominal dimensions of ca
31、rpenters squares and bevels shall be as shown in Figure 2 andFigure 3 and Table 1 and Table 2. 9 Finish 9.1 Blades. The blades shall be smoothly finished and shall be chemically blued or blacked or protected in a similar manner. 9.2 Stocks. The stocks shall be smoothly finished and if made of wood s
32、hall be polished. 9.3 Other metal parts. Other metal parts shall be given suitable anti-corrosion treatment. 10 Marking Carpenters squares and bevels shall be legibly and indelibly marked with the manufacturers or suppliers name or trademark. NOTETools may be additionally marked with the number of t
33、his British Standard, i.e.BS3322 1) . 11 Performance tests 11.1 Permanent set. Secure the stock firmly and flex the tip of the blade through an angle of15 in either lateral direction for a115mm square, and30 in either lateral direction for all other sizes of squares and bevels. The blade of each bev
34、el shall be fully extended and in line with the stock when conducting this test. 1) Marking BS3322 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solel
35、y the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, British Standards Institution, Maylands Avenue, Hemel Hempstead, Herts HP24SQ in the case of certification marks administered by BSI or to the
36、 appropriate authority for other certification marks. Figure 1 Error in lateral squarenessBS3322:1981 BSI 11-1999 3 Table 1 Nominal dimensions of carpenters squares Table 2 Nominal dimensions of carpenters sliding bevels A B C D E F G mm 115 150 190 230 305 mm 50 50 55 55 65 mm 110 135 145 170 215 m
37、m 40 40 45 45 50 mm 15 20 20 20 20 mm 100 130 140 160 205 mm 3 3 3 3 3 A B C D E F G H (min) J (min) mm 190 230 265 305 mm 25 25 25 25 mm 85 105 125 145 mm 7 7 7 7 mm 125 145 165 185 mm 27 27 27 27 mm 17 17 17 17 mm 25 25 25 25 mm 16 16 16 16 Figure 2 Carpenters squaresBS3322:1981 4 BSI 11-1999 11.2
38、 Blade security of carpenters squares. Apply a metal mass of4kg onto the edge of the blade at a distance of110mm from the stock for squares of115mm blade length and150mm from the stock for all other sizes. The metal mass shall fall freely onto the edge of the blade from a height of100mm as shown in
39、Figure 4. 11.3 Blade security of carpenters bevels. Lock the blade in the fully extended position and at90 to the stock. Secure the stock firmly and apply a mass of1.5kg to the edge of the blade to give a turning moment of1.5Nm about the axis of the locking screw. Table 3 Position of load applicatio
40、n for blade security of carpenters squares Figure 3 Carpenters sliding bevels Blade length A Distance from stock X mm 115 150 190 230 305 m 110 150 BS3322:1981 BSI 11-1999 5 NOTESeealso Table 3. Figure 4 Test for blade security of carpenters squaresBS3322:1981 6 BSI 11-1999 Figure 5 Test for blade s
41、ecurity of carpenters bevelsBS3322:1981 BSI 11-1999 7 Appendix ARecommended materials for carpenters squares and bevels A.1 Blades Blades manufactured from steel capable of being heat treated to meet the hardness requirements in clause5 and passing the tests specified in clause11. A.2 Rivets Rivets,
42、 either of steel complying with the requirements of BS1052, or of brass complying with the requirements of BS2874. A.3 Facing plates, tips and spacing pieces Facing plates, etc., made from brass complying with the requirements of BS2870 when used in conjunction with wood stocks. A.4 Stocks Stocks ma
43、de of wood, plastics or metal. When using wood, stocks made of a stable hardwood, such as beech or rosewood, straight-grained and free from sapwood or any visible defects, with a moisture content not exceeding11%. Wooden stocks should be supplied with a metal face plate. When using plastics, its sta
44、bility should be equal to that of beech or rosewood. A.5 Locking screws for bevels Locking screws for bevels made from free cutting steel complying with the requirements of BS970-1, e.g.220M07, or of brass complying with the requirements of BS2874. Appendix BMethods of testing accuracy B.1 A test fo
45、r checking the straightness of working faces and working edges The working faces and working edges of squares and bevels can be tested for accuracy by bedding them evenly on the working surface of a grade B surface plate, complying with the requirements of BS817, and ensuring that a feeler gauge, co
46、mplying with the requirements of BS957-2, and with a thickness of the maximum appropriate tolerance specified in7.1, cannot pass between them and the surface plate. B.2 A test for checking the parallelism of faces and of working edges The parallelism of the working and outer face of a square and the
47、 working edges of squares and bevels, as specified in7.2, can be checked by direct measurement. B.3 A test for checking squareness The squareness of the inner working edge of the blade of a square to its working face, as specified in7.3, can be checked by comparing it to a grade A engineers square a
48、s specified in BS939.8 blankBS3322:1981 BSI 11-1999 Publications referred to BS427, Method for Vickers hardness test. BS427-1, Testing of metals. BS427-2, Verification of the testing machine. BS817, Surface plates and tables. BS939, Specification for engineers squares(including cylindrical and block
49、 squares). BS957, Feeler guages. BS957-2, Metric units. BS970, Wrought steels in the form of blooms, billets, bars and forgings. BS970-1, Carbon and carbon manganese steels including free cutting steels. BS1052, Specification for mild steel wire for general engineering purposes. BS2870, Specification for rolled copper and copper alloys: sheet, strip and foil. BS2874, Copper and copper alloys. Rods and sections(other than forging stock). BS3643, ISO metric screw threads. BS3643-1, Thre
