1、BRITISH STANDARD BS ISO 839-1:2006 Milling machine arbors with 7/24 tapers Part 1: Dimensions and designation ICS 25.060.20 BS ISO 839-1:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2007 BSI 2007 ISBN 978 0 580 50285 9 Nat
2、ional foreword This British Standard was published by BSI. It is the UK implementation of ISO 839-1:2006. It supersedes BS 5517:1977 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MTE/5, Engineers rotary cutting tools of high speed steel. A list of o
3、rganizations represented on MTE/5 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.
4、 Amendments issued since publication Amd. No. Date Comments Reference number ISO 839-1:2006(E)INTERNATIONAL STANDARD ISO 839-1 Second edition 2006-12-01 Milling machine arbors with 7/24 tapers Part 1: Dimensions and designation Arbres porte-fraises au cne 7/24 Partie 1: Dimensions et dsignation BS I
5、SO 839-1:2006ii iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a s
6、ubject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
7、(IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical comm
8、ittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not
9、be held responsible for identifying any or all such patent rights. ISO 839-1 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 2, High speed steel cutting tools and their attachments. This second edition cancels and replaces the first edition (ISO 839-1:1976), which has bee
10、n technically revised. ISO 839 consists of the following parts, under the general title Milling machine arbors with 7/24 tapers: Part 1: Dimensions and designation Part 2: Accessories BS ISO 839-1:2006blank 1 Milling machine arbors with 7/24 tapers Part 1: Dimensions and designation 1 Scope This par
11、t of ISO 839 specifies the dimensions of milling machine arbors with 7/24 tapers in accordance with ISO 297. It also specifies the designation of these arbors. NOTE The accessories of these arbors (spacing collars, bearing collars and clamping nuts) are specified in ISO 839-2. 2 Normative references
12、 The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 297:1988, 7/24 tapers for tool shanks for ma
13、nual changing ISO 2768-1:1989, General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications 3 Choice of dimensions and tolerances The diameters, which have been adopted in this part of ISO 839 as the most commonly used, correspond to the values giv
14、en in ISO 240 from 16 mm to 100 mm (omitting 19 mm and 70 mm). The shoulder, whether cylindrical or tapered, between the flange of diameter d 1and the cylindrical portion of diameter d, is optional. With or without the shoulder, however, the diameter of the flange locating face shall not in any case
15、 be less than d 2 . 4 Dimensions 4.1 General All dimensions and tolerances are given in millimetres. Tolerances not specified shall be of tolerance class m, in accordance with ISO 2768-1:1989. 4.2 Principal dimensions The principal dimensions of milling machine arbors with 7/24 tapers are shown in F
16、igure 1 and given in Table 1. BS ISO 839-1:20062 Key 1 7/24 taper in accordance with ISO 297 2 cutter radius 3 cylindrical or taper Figure 1 Principal dimensions of milling machine arbors with 7/24 tapers BS ISO 839-1:2006Table 1 Principal dimensions of milling machine arbors with 7/24 tapers Useful
17、 length l 17/24 taper No. b N11 d 1d 2d 3d 4e 63 100 160 200 250 315 400 500 630 800 1 000 l 2l 34 16 27 M 16 1,5 18 6 22 34 M 20 1,5 24 30 7 27 50 41 M 24 1,5 8 32 30 4 16 27 M 16 1,5 18 6 22 34 M 20 1,5 24 7 27 41 M 24 1,5 30 8 32 47 M 30 1,5 34 40 10 40 63 55 M 36 2 10 36 42 6 22 34 M 20 1,5 24 7
18、 27 41 M 24 1,5 30 8 32 47 M 30 1,5 34 10 40 55 M 36 2 42 12 50 69 M 42 2 48 50 14 60 100 84 M 52 2 12 45 58 12 50 69 M 42 2 48 14 60 84 M 52 2 58 18 80 109 M 68 3 72 60 24 100 160 134 M 80 4 16 56 82 y according to length 0,015 0,0200,0300,0350,04 3 BS ISO 839-1:20064 4.3 Pilot at end of arbor The
19、dimensions of the pilot at the end of the arbor are shown in Figure 2 and given in Table 2. Figure 2 Dimensions of pilot at end of arbor Table 2 Dimensions of pilot at end of arbor d 1d 4d 5g6 l 416 M 16 1,5 13 20 22 M 20 1,5 16 25 27 M 24 1,5 20 32 M 30 1,5 23 40 M 36 2 29 32 50 M 42 2 34 60 M 52 2
20、 40 56 BS ISO 839-1:2006 5 4.4 Protective boss at end of arbor The dimensions of the protective boss at the end of the arbor are shown in Figure 3 and given in Table 3. Figure 3 Dimensions of protective boss at end of arbor Table 3 Dimensions of protective boss at end of arbor d 1d 4d 5l 5 min. 16 M
21、 16 1,5 13 22 M 20 1,5 16 27 M 24 1,5 20 32 M 30 1,5 23 40 M 36 2 29 2 50 M 42 2 34 60 M 52 2 40 3 80 M 68 3 49 100 M 80 4 61 5 5 Material The material is at the option of the manufacturer; however, the tensile strength shall be at least 800 N/mm 2 . Hardness shall be 56 +4HRC. 6 Designation A milli
22、ng machine arbor with 7/24 taper in accordance with this part of ISO 839 shall be designated by: a) “Arbor”; b) reference to this part of ISO 839, i.e. “ISO 839-1”; c) dash; d) 7/24 taper number/dimension of d 1 ; e) information as to whether the end of arbor is protected or piloted, or nothing. EXA
23、MPLE Designation of a milling machine arbor with 7/24 taper in accordance with ISO 839-1, 7/24 taper No. 40, d 1= 8 mm and with protected end of arbor: Arbor ISO 839-1 - 40/8 protected BS ISO 839-1:20066 Bibliography 1 ISO 240:1994, Milling cutters Interchangeability dimensions for cutter arbors or
24、cutter mandrels BS ISO 839-1:2006blankBS ISO 839-1:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is in
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