BS ISO 8038-2013 en_5299 Microscopes Screw threads for objectives and related nosepieces《显微镜.物镜及物镜座螺纹》.pdf

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1、BSI Standards Publication BS ISO 8038:2013 Microscopes Screw threads for objectives and related nosepiecesBS ISO 8038:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8038:2013. It supersedes BS ISO 8038:2011 which is withdrawn. The UK participation in it

2、s preparation was entrusted to Technical Committee CPW/172, Optics and Photonics. A list of organizations represented on this committee 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

3、correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 80926 2 ICS 37.020 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and

4、 Strategy Committee on 30 November 2013. Amendments issued since publication Date Text affectedBS ISO 8038:2013 ISO 2013 Microscopes Screw threads for objectives and related nosepieces Microscopes Filetages de fixation des objectifs et des porte-objectifs correspondants INTERNATIONAL STANDARD ISO 80

5、38 Third edition 2013-11-01 Reference number ISO 8038:2013(E)BS ISO 8038:2013ISO 8038:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by an

6、y means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 G

7、eneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 8038:2013ISO 8038:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Types of screw thread . 1 3 Basic dimensions 1 3.1 General . 1 3.2 Tolerance

8、s . 2BS ISO 8038:2013ISO 8038:2013(E) 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

9、 interested in a subject 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 Electrotec

10、hnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO

11、 documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held res

12、ponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information giv

13、en for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the followi

14、ng URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 172, Optics and photonics, Subcommittee SC 5, Microscopes and endoscopes. This third edition cancels and replaces the second edition (ISO 8038:2011), in which Table 4 has been technically revised.iv IS

15、O 2013 All rights reservedBS ISO 8038:2013INTERNATIONAL ST ANDARD ISO 8038:2013(E) Microscopes Screw threads for objectives and related nosepieces 1 Scope This International Standard specifies the dimensions of screw thread types for connecting a microscope objective to the nosepiece. The use of the

16、se screw thread types is recommended for microscopes unless other fittings are required for optical or design reasons. NOTE A specific combination of eyepiece, objective and tube lens (if provided, e.g. in an infinity-corrected optical system) is frequently used to correct aberrations. Therefore the

17、 combination of an objective from one manufacturer and the tube lens or eyepiece from another manufacturer, although conforming to this International Standard, may cause an error in magnification and/or loss of image quality. 2 Types of screw thread Types of screw thread are listed in Table 1. Table

18、 1 Types of screw thread Name of screw type Whitworth screw RMS a W26 Metric screw M25 M27 M32 aWith the exception of the length of the thread lug (see Figure 1), the values of the RMS thread conform to the internationally used screw thread defined by the Royal Microscopical Society Standard (RMS St

19、andard), in 1936. 3 Basic dimensions 3.1 General The basic dimensions of each screw thread type shall be in accordance with those given in Table 2 and illustrated in Figure 1. Table 2 Basic dimensions of the screw thread Dimensions Symbol Value Whitworth screw Metric screw RMS W26 M25 M27 M32 Angle

20、of thread 55 55 60 60 60 Pitch p 0,706 mm 0,706 mm 0,75 mm 0,75 mm 0,75 mm Height of fundamental triangle H 0,678 mm 0,678 mm 0,65 mm 0,65 mm 0,65 mm Nominal diameter D 20,320 mm 26 mm 25 mm 27 mm 32 mm ISO 2013 All rights reserved 1BS ISO 8038:2013ISO 8038:2013(E) 3.2 Tolerances Limit of sizes and

21、tolerances of each screw thread type shall be in accordance with those given in Tables 3, 4, 5, 6, 7 and illustrated in Figures 1 and 2. Table 3 Limit of size and tolerances of RMS Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal

22、and external threads Allow- ances Tolerance Thread lug Internal thread max. D 20,396 D 2 19,944 D 1 19,492 Minimum play 0,046 Maximum play 0,198 +0,076 0,076 min. 20,320 19,868 19,416 0,000 External thread max. d 20,274 d 2 19,822 d 1 19,370 0,046 0,076 5,000 min. 20,198 19,746 19,294 0,122 Table 4

23、Limit of size and tolerances of W26 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 25,660 D 1 25,300 Minimum play 0,060 Maximum play 0,220 +0,204

24、0,100 min. 26,000 25,580 25,200 +0,104 External thread max. d 25,930 d 2 25,520 d 1 25,070 0,070 0,100 5,000 min. 25,830 25,440 24,940 0,170 Table 5 Limit of size and tolerances of M25 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between inter

25、nal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 24,659 D 1 24,378 Minimum play 0,022 Maximum play 0,279 +0,190 0,190 min. 24,513 24,188 0,000 External thread max. d 24,978 d 2 24,491 d 1 0,022 0,140 5,000 min. 24,838 24,380 0,162 Table 6 Limit of size and tolera

26、nces of M27 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 26,660 D 1 26,378 Minimum play 0,022 Maximum play 0,281 +0,190 0,190 min. 26,513 26,188

27、 0,000 External thread max. d 26,978 d 2 26,491 d 1 0,022 0,140 4,500 min. 26,838 26,379 0,162 2 ISO 2013 All rights reservedBS ISO 8038:2013ISO 8038:2013(E) Table 7 Limit of size and tolerances of M32 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated p

28、lay between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 31,663 D 1 31,378 Minimum play 0,022 Maximum play 0,286 +0,190 0,190 min. 31,513 31,188 0,000 External thread max. d 31,978 d 2 31,491 d 1 0,022 0,140 5,000 min. 31,838 31,377 0,162 ISO 2013 All ri

29、ghts reserved 3BS ISO 8038:2013ISO 8038:2013(E) Dimensions in millimetres a) b) Key 1 tube, objective changer, etc 2 thread lug 3 objective 4 internal thread 5 external thread Figure 1 Definitions and basic dimensions of Whitworth screw threads, RMS and W264 ISO 2013 All rights reservedBS ISO 8038:2

30、013ISO 8038:2013(E) Dimensions in millimetres a) b) Key 1 tube, objective changer, etc 2 thread lug 3 objective 4 internal thread 5 external thread Figure 2 Definitions and basic dimensions of Metric screw threads, M25, M27 and M32 ISO 2013 All rights reserved 5BS ISO 8038:2013ISO 8038:2013(E) ISO 2

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