JAPAN ≠ EDICT OF GOVERNMENT ± In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. JIS B 4802 (1998) (English): Circular saw blades for woodworking The citizens of a nation must honor the laws of the land. Fukuzawa Yukichi JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association o JIS B 4802: 1998 Circular saw blades for woodworking les 79.120.20 Descriptors: circular saws (machines), woodworking machines, cutting tools, woodworking, blades Reference number : JIS B 4802 : 1998 (E) PROTECTED BY COPYRIGHT 4 S B 4802:1998 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Consequently, JIS B 4802:1973 is replaced with JIS B 4802:1998. This revision is intended to conform to corresponding International Standard, ISO 2935: 1974, Circular saw blades for woodworking - Dimensions and practical use. Attention is drawn to the possibility that some parts of this Standard lllay conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Comnlittee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. Date of Establishment: 1950-08-14 Date of Revision: 1998-03-20 Date of Public Notice in Official Gazette: 1998-03-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Machine Elements JIS B 4802 :1998, First English edition published in 1998-07 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. © JSA 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT JAPANESE INDUSTRIAL STANDARD B 4802: 1998 Circular saw Introduction This Japanese Industrial Standard has been made on the basis of ISO 2935, Circular saw blades for woodworking - Dimensions published in 1974 as the first edition, without changing the technical contents except the classes and their shapes and dimensions specified conventionally in the Japanese Industrial Standard. Besides, the items (quality, material, test l11ethod, inspection, designation of products and marking) not specified in the corresponding International Standard were also added to this Japanese Industrial Standard. 1 Scope This Japanese Industrial Standard specifies the circular saw blades for woodworking (hereafter referred to as lIcircular sawtl). Those of special type such as miter saws are excluded. Remarks: The following is the corresponding International Standard to this Standard: ISO 2935: 1974 Circular saw blades for woodworking - Dimensions 2 Normative references The following standards contain provisions which, through references in this Standard, constitute provisions of this Standard. The most recent editions of the standards indicated below shall be applied. JIS B 7502 Micrometer callipers JIS B 7503 Dial gauges JIS B 7726 Rockwell and Rockwell superficial hardness testing machines JIS G 4401 Carbon tool steels JIS Z 2245 Method of Rockwell and Rockwell superficial hardness test 3 Quality 3.1 Appearance The appearance shall be free from cracks, flaws harmful in use and the finish shall be good. 3 .. 2 Variation of thickness The variation of thickness of the circular saw shall be as given in Table 1. Table 1 Variation of thickness Unit: mm Division of outside Variation of thickness diameter (in a single saw) 630 or under 0.06 or under Exceeding 630 0.1 or under PROTECTED BY COPYRIGHT 2 B 4802: 1998 3.3 Thickness The hardness and variation of of the circular saw shaH be as given in Table 2. Table 2 Hardness Variation of hardness Division of outside diameter Hardness (in saw) mm HRe HRC 630 or under 4:3 to 54 4 or under Exceeding 630 40 to 51 5 or under 3.4 Axial rUDout The axial runout of the circular saw shall be as given in Table 3. Table 3 Axial runout Unit: mm i Division of 300 or under Exceeding 300 Exceeding 630 Exceeding 1 000 outside diameter up to and ! up to and including 630 including 1000 Axial runout 0.5 max. 0.9 max. 1.5 max. 2.5 max. 4 Shape and dimensions The shape and dimensions shall be as given in Attached Table 1. 5 Materials The materials for the circular saw shall be SK5 specified in JIS G 4401 or the materials equivalent or superior thereto in performance. 6 Test method 6.1 Thickness The thickness shall be measured at any four points on the circumference approximately 5 mm to 15 mm inside the bottom of gullet, using a micrometer specified in JIS B 7502. The variation of thickness shall be expressed with the difference between the maximum value and the minimum value out of the values measured on a single saw. 6.2 Hardness The hardness shall be measured at the similar points to those in 6.1 using a Rockwell hardness testing machine specified in JIS B 7726 in accordance with the test method specified in JIS Z 2245. The variation of hardness shall be expressed with the difference between the maximum value and the minimum value out of the values measured on a single saw. 6.3 Axial runout The axial run out shall be measured, as shown in Fig. 1, on the circumference approximately 5 mm to 15 mm inside the bottom of gUllet using a dial gauge specified in JIB B 7503, and the maximum value of the measured values shall be taken as the axial runout. PROTECTED BY COPYRIGHT 3 B 4802: 1998 Measuring position S of axial runout E Dial gauge \ '-- Rotating shaft Fig. 1 Axial runout Relnarks: The measuring apparatus shown is an exam+pl e. The diameter of the flange in this case shall be not more than of the outside diameter of the circular saw. 7 Inspection Inspection shall be carried out on quality, shape and dimension and the result shall conform to the requirements in 3 and 4. 8 Designation of products The designation of products shall be given by the number of Standard or title of Standard, outside thickness and diameter of hole. Examples: JIS B 4802 400x1.6x30 Circular saw blades 400x1.6x30 for woodworking 9 Marking The following information shall be marked on the product. a) Outside diameter (D) x thickness (T) x diameter of hole Cd) b) Name of material or symbol c) Manufacturer1s name or its abbreviation PROTECTED BY COPYRlGHT 4. B 4802: 1998 Attached Table 1 Shape and dimension T i The shape of teeth is shown as an example. Unit: mm Outer diameter Thickness Diameter of Reference hole I Number of lJ Tolerance T Tolerance d II teeth , 10 ± 1.5 O.H In the case 12.5 I 80, 90. 100 of the 50 thickness of 2 or under i 63 ±OJ)6 80 100 I ±2 20 In t,he case of the 125 O.B, thickness f------ exceeding 2 HO 0,8, I, 1.2, 1.4 .±O.l I 160 i I, 1.2, 1..4· 1.6 20 180 ~. ~. 30, 60 200 I 1. 1.2. }A. 1.6. 2 25.4. 30. 60 250 1.2. 11. 1.6, 2. 2.5 300 ±3 - 315 I 1.2, 1.4. l.6. 2, 2,5. 3.2 355 ! 400 450 1.4. L~, 2, 2.S, 3.2. 4 25.4. 30, 85 500 ±4 630 l5!. ~. 2.5. 3.2. 4 31.75. 40 800 ±6 38.1. 40 70. 80. 100 1000 1.6. g. 2.5, 3.2. 4, 5 1250 ±10 ~. 2.5. 3.6. 4, 5 44.45. 60 1600 4.5, 5, 6 60 2000 5. 7 Remarks 1 The tolerance on the diameter of hole shall be HIl. However, H9 is intended for particular uses, such as: use on the same spindle with several blades, blades turning at high speed. 2 The values underlined in the Table are the dimensions not included in the original International Standard. PROTECTED BY COPYRIGHT